{"title":"Astronomik 6nm MaxFR Filters for Astrophotography","description":"\u003ch2\u003eAstronomik 6nm MaxFR Filters\u003c\/h2\u003e\u003cp\u003eAstronomik 6nm MaxFR narrowband filters engineered for high-contrast astrophotography and precise emission line capture.\u003c\/p\u003e","products":[{"product_id":"astronomik-oiii-6nm-ccd-maxfr-1-25-premium-deep-sky-filter","title":"Astronomik OIII 6nm CCD MaxFR 1.25'' – Premium Deep-Sky Filter","description":"\u003ch1\u003eAstronomik OIII 6nm CCD MaxFR 1.25'' (M28.5) Filter for Astrophotography\u003c\/h1\u003e\n\n\u003ch2\u003eMaxFR Narrowband Emission Line Filters for Fast Optical Systems\u003c\/h2\u003e\n\u003cp\u003eThere is an ever-growing demand for astrophotography filters suitable for extremely fast optical systems like Celestron's RASA and Takahashi's Epsilon Astrographs. The Astronomik MaxFR series of narrowband-emission line filters is designed to deliver the highest quality data for fast optical systems, enabling deep-sky imaging with maximum contrast and minimal stray light.\u003c\/p\u003e\n\n\u003ch3\u003eWhy Choose Astronomik MaxFR Filters for Astrophotography?\u003c\/h3\u003e\n\u003cp\u003eThe MaxFR emission line filters are engineered to work with fast focal ratios, making them ideal for deep-sky imaging. You can select filters with 12nm or 6nm bandwidth (FWHM) for the three most important emission lines in astrophotography: oxygen (OIII), hydrogen (H-alpha), and sulfur (SII).\u003c\/p\u003e\n\n\u003ch2\u003eKey Features of Astronomik OIII 6nm CCD MaxFR Filter\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eHighest transmission for excellent image quality.\u003c\/li\u003e\n  \u003cli\u003eMinimized stray light and no halos.\u003c\/li\u003e\n  \u003cli\u003eNeedle-sharp stars in your astrophotography images.\u003c\/li\u003e\n  \u003cli\u003eCompatible with fast optical systems, suitable for focal ratios as low as f\/1.4.\u003c\/li\u003e\n  \u003cli\u003eDurable coating, resistant to scratches and moisture.\u003c\/li\u003e\n  \u003cli\u003eAvailable in 1.25\" up to 50mm x 50mm filter sizes.\u003c\/li\u003e\n  \u003cli\u003e10-year guarantee on all Astronomik filters.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow Astronomik MaxFR Filters Improve Astrophotography\u003c\/h3\u003e\n\u003cp\u003eThe new MaxFR filters are made with advanced MFR coating technology, providing exceptional out-of-band blocking across the entire wavelength range from UV to IR. This ensures an extremely high contrast, reduced stray light, and no halos in your final astrophotography images.\u003c\/p\u003e\n\n\u003ch3\u003eMaxFR Filter Performance at Different Focal Ratios\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003e12nm Filters:\u003c\/strong\u003e Usable from f\/1.7 to f\/8, with about 85% of maximum transmission at f\/1.4.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e6nm Filters:\u003c\/strong\u003e Usable from f\/2.2 to f\/8, with about 90% of maximum transmission at f\/2.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eNarrowband Imaging with Astronomik Filters: Boost Contrast and Block Light Pollution\u003c\/h2\u003e\n\u003cp\u003eIf you frequently image from light-polluted areas, narrowband-emission line filters are your best tool for capturing high-contrast deep-sky images. An H-alpha filter is often the first choice for imaging red nebulae, while OIII filters expand your imaging possibilities by revealing blue-green nebulae and planetary structures. Combine H-alpha, OIII, and SII filters to create stunning Hubble Space Telescope-like images.\u003c\/p\u003e\n\n\u003ch3\u003eFAQ: Which Bandwidth Should I Choose - 6nm or 12nm?\u003c\/h3\u003e\n\u003cp\u003eChoosing between 6nm and 12nm depends on your imaging setup and location. For cameras with low dark current and effective cooling, the 6nm filter is ideal for reducing background light and capturing fainter details. The 12nm filter is suitable for DSLR cameras and imaging setups with limited cooling or dark current control.\u003c\/p\u003e\n\n\u003ch3\u003eHow Astronomik Filters Enhance Exposure Time\u003c\/h3\u003e\n\u003cp\u003eWith Astronomik narrowband filters, you don’t have to increase exposure time, but you can if needed. The filters allow nearly all emission line photons to pass through while blocking unwanted light, giving you the flexibility to capture deeper images with longer exposures, especially in light-polluted areas.\u003c\/p\u003e\n\n\u003ch2\u003eWhy Astronomik Filters Are the Best Choice for Astrophotography\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMFR Coating:\u003c\/strong\u003e Filters can be used down to f\/1.4 for 12nm and f\/2 for 6nm.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHigh-Quality Substrate:\u003c\/strong\u003e Made from stress-free, optically polished glass for perfect images.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eParfocal Filters:\u003c\/strong\u003e Astronomik filters are parfocal, so no refocusing is needed when changing filters.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDurability:\u003c\/strong\u003e Resistant to scratches and moisture, with no performance degradation over time.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eIntegrated Blocking:\u003c\/strong\u003e Blocks unwanted light from UV to IR, eliminating the need for additional UV\/IR blocking filters.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWide Range of Sizes:\u003c\/strong\u003e Available in sizes from 1.25\" to 50mm x 50mm square filters.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e10-Year Guarantee:\u003c\/strong\u003e Astronomik offers a 10-year guarantee on all filters.\u003c\/li\u003e\n\u003c\/ul\u003e\n","brand":"Astronomik","offers":[{"title":"Default Title","offer_id":41821309698225,"sku":"8H11F9","price":241.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0523\/1650\/4241\/files\/astronomik-oiii-6nm-ccd-maxfr-125-m285-828472.jpg?v=1718364453"},{"product_id":"astronomik-oiii-6nm-ccd-maxfr-2-filter-for-fast-optical-systems","title":"Astronomik OIII 6nm CCD MaxFR 2'' Filter for Fast Optical Systems","description":"\u003ch1\u003eAstronomik OIII 6nm CCD MaxFR 2'' (M48)\u003c\/h1\u003e\n\n\u003ch4\u003eMaxFR Astronomik photographic narrowband-emission line filters for fast optical systems.\u003c\/h4\u003e\n\n\u003ch4\u003eThere is an ever-growing demand for filters suitable for extremely fast optical systems like Celestron’s RASA and Takahashi Epsilon Astrographs.\u003c\/h4\u003e\n\n\u003ch4\u003eOur novel MaxFR emission line filters are suitable up to very fast focal ratios. The new Astronomik MaxFR series of narrowband-emission line filters is perfectly matched to the requirements of astronomical deep-sky imaging with fast optical systems. For the three most important emission lines of oxygen (OIII), hydrogen (H-alpha), and sulfur (SII), you may select your filters either with 12nm or 6nm Bandwidth (FWHM).\u003c\/h4\u003e\n\n\u003cp\u003e\u003cstrong\u003eMaxFR OIII-CCD filter\u003c\/strong\u003e\u003cbr\u003e\n\u003cspan\u003e6nm and 12nm FWHM\u003c\/span\u003e\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eMaxFR H-alpha-CCD filter\u003c\/strong\u003e\u003cbr\u003e\n\u003cspan\u003e6nm and 12nm FWHM\u003c\/span\u003e\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eMaxFR SIII-CCD filter\u003c\/strong\u003e\u003cbr\u003e\n\u003cspan\u003e6nm and 12nm FWHM\u003c\/span\u003e\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eHighest transmission:\u003c\/strong\u003e\u003cbr\u003e\nOur new MaxFR filters are designed for fast optical systems, featuring MFR Coating technology that provides the best out-of-band blocking possible across the entire range of wavelengths from the UV to IR. The design ensures extremely high contrast, minimized stray light, no halos, and needle-sharp stars. Astronomik MFR filters give you the best quality data for post-processing into stunning final images.\u003c\/p\u003e\n\n\u003cul\u003e\n    \u003cli\u003e\n\u003cstrong\u003e12nm MaxFR filters:\u003c\/strong\u003e Usable from f\/1.7 to f\/8 with about 85% maximum transmission at f\/1.4.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003e6nm MaxFR filters:\u003c\/strong\u003e Usable from f\/2.2 to f\/8 with about 90% maximum transmission at f\/2.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eImaging with Narrowband-Emission Line Filters\u003c\/strong\u003e\u003cbr\u003e\nWhen observing from light-polluted locations, narrowband-emission line filters are your best tool for capturing amazing deep-sky images. Using an H-alpha filter enables deep, high-contrast images even under heavy light pollution or during a full moon. H-alpha filters are ideal for imaging nebulae that glow red, while an OIII filter lets you capture greenish-blue structures like planetary nebulae. The SII filter completes the HSO set, allowing you to process images like the Hubble Space Telescope!\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQuality aspects of the new Astronomik MFR narrowband-emission line filters:\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cul\u003e\n    \u003cli\u003e\n\u003cstrong\u003eMFR Coating:\u003c\/strong\u003e 12nm filters work down to f\/1.4, and 6nm filters down to f\/2.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eHigh-Quality Substrate:\u003c\/strong\u003e Optically polished glass, made with stress- and striae-free materials.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eParfocal Filters:\u003c\/strong\u003e All Astronomik filters are parfocal, ensuring no shift in the focal plane when changing filters.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eDurability:\u003c\/strong\u003e Highly scratch-resistant and unaffected by humidity or aging, these filters maintain their performance over many years.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eIntegrated Blocking:\u003c\/strong\u003e Full blocking of unwanted light across the UV to IR spectrum, so no additional UV\/IR blocker is needed.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eAvailable Sizes:\u003c\/strong\u003e From 1.25\" up to 50mm x 50mm square filters.\u003c\/li\u003e\n    \u003cli\u003eComes in a \u003cstrong\u003ehigh-quality protection \u0026amp; storage box\u003c\/strong\u003e.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003e10-year guarantee\u003c\/strong\u003e on all filters.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWith Astronomik filters, you get the highest quality possible for astrophotography, especially when dealing with light pollution. These filters will continue to perform as well as new even after years of use. Thanks to the MFR coating, they are compatible with nearly any instrument you may use.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eFAQs:\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cul\u003e\n    \u003cli\u003e\u003cstrong\u003eWhich is better, 12nm or 6nm?\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eIf you have a camera with low dark current and effective cooling, 6nm filters offer better blocking of background light and enable deeper exposures. For DSLR and dark-current-limited cameras, 12nm filters are the better choice.\u003c\/p\u003e\n\n\u003cul\u003e\n    \u003cli\u003e\u003cstrong\u003eHow does using these filters affect exposure time?\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWhile you don’t have to expose longer with a narrowband filter, you can do so to capture fainter structures. These filters block unwanted light while allowing nearly all emission line photons to pass through. By reducing the background signal, they enable longer exposures, potentially up to 30 minutes, to reveal more details.\u003c\/p\u003e\n","brand":"Astronomik","offers":[{"title":"Default Title","offer_id":41821317857457,"sku":"","price":582.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0523\/1650\/4241\/files\/astronomik-oiii-6nm-ccd-maxfr-2-m48-418414.jpg?v=1718364249"},{"product_id":"astronomik-oiii-6nm-ccd-maxfr-clip-filter-nikon-z-xl-deep-sky-imaging","title":"Astronomik OIII 6nm CCD MaxFR Clip-Filter Nikon Z XL - Deep-Sky Imaging","description":"\u003ch1\u003eAstronomik OIII 6nm CCD MaxFR Clip-Filter Nikon Z XL\u003c\/h1\u003e\n\n\u003ch4\u003eMaxFR Astronomik photographic narrowband-emissionline filters for fast optical systems\u003c\/h4\u003e\n\n\u003ch4\u003eThere is an ever-growing demand for filters suitable for extremely fast optical systems like Celestron's RASA and the Epsilon Astrographs made by Takahashi.\u003c\/h4\u003e\n\n\u003ch4\u003eOur novel MaxFR emission line filters are suitable up to very fast focal ratios. The new Astronomik MaxFR series of narrowband-emission line filters is perfectly matched to the requirements of astronomical deep-sky imaging with fast optical systems. For the three most important emission lines of oxygen (OIII), hydrogen (H-alpha), and sulfur (SII), you may select your filters either with 12nm or 6nm Bandwidth (FWHM).\u003c\/h4\u003e\n\n\u003cp\u003e\u003cstrong\u003eHighest transmission:\u003c\/strong\u003e\u003cbr\u003e\nOur new MaxFR filters are made in a completely new way, designed to work perfectly with fast optical systems. The built-in well-known MFR Coating technique gives you the best out-of-band blocking possible across the entire range of wavelengths from the UV up to IR! Your advantage of our new design is \u003cstrong\u003eextremely high contrast\u003c\/strong\u003e, minimized stray light, \u003cstrong\u003eno halos\u003c\/strong\u003e, and \u003cstrong\u003eneedle-sharp stars\u003c\/strong\u003e. The Astronomik MFR narrowband-emission line filters give you the best quality of data: The best start material to be processed to an awesome final image!\n\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003e\u003cstrong\u003eFor 12nm MaxFR filters, this means unlimited usability from f\/1.7 to f\/8 and about 85% of the maximum transmission at f\/1.4 as guaranteed.\u003c\/strong\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003cstrong\u003eFor 6nm MaxFR filters, this means unlimited usability from f\/2.2 to f\/8 with about 90% of the maximum transmission at f\/2 as guaranteed performance data.\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eFor maximum contrast, the SII filter is carefully designed to block all light coming from H-alpha and NII (nitrogen).\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eImaging with Narrowband-Emissionline Filters\u003c\/strong\u003e\u003cbr\u003e\nIf you have to observe from light-polluted sites (like most of us), imaging with narrowband-emission line filters is the best way to take great images, as all kinds of light pollution can be blocked very effectively! Normally, an H-alpha filter should be your first step into this amazing field of astrophotography. With a Narrowband H-alpha filter, you will be able to take deep and contrasting images even with very heavy light pollution or with the full moon high up in the sky!\u003cbr\u003e\nIf you look at other astrophotographs, an H-alpha is the best choice for all nebulae glowing red! An OIII filter expands your imaging possibilities, as you are able to image all greenish\/bluish structures. Planetary nebulae and star-forming regions are great targets! The SII filter completes your HSO-set of filters. With these three filters, you are able to process your images like the ones from the Hubble space telescope!\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQuality aspects of the new Astronomik MFR narrowband-emission line filters:\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMFR Coating:\u003c\/strong\u003e The 12nm filters can be used on all instruments down to f\/1.4, the 6nm filters down to f\/2.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHigh-Quality substrate:\u003c\/strong\u003e Astronomik filters are made with stress- and striae-free, optically polished glass. The filter itself is made of ultra-thin layers on this substrate!\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eParfocal filters:\u003c\/strong\u003e All Astronomik Filters are parfocal! Due to the very small thickness-tolerance, the focal plane is not shifted when changing filters!\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCoating:\u003c\/strong\u003e Astronomik filters are made of up to 170 layers that are coated on both sides of the substrate. These layers form the filter itself and act as an Anti-Reflection Coating.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDurability:\u003c\/strong\u003e Due to our coating technique, all Astronomik filters are highly scratch-resistant, not sensitive to moisture, and do not degrade when getting older. Every Astronomik filter will deliver its full performance and meet the specs at the point of shipping even after lots of years.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eIntegrated Blocking:\u003c\/strong\u003e All unwanted light is blocked in the whole spectral range from UV up to the IR! (You will not need an additional UV \u0026amp; IR-Blocker when imaging with any of our new narrowband-emission line filters with this coating!)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWide range of available sizes\u003c\/strong\u003e from 1.25\" up to square 50mm x 50mm filters.\u003c\/li\u003e\n  \u003cli\u003eDelivered in a \u003cstrong\u003ehigh-quality protection \u0026amp; storage box\u003c\/strong\u003e.\u003c\/li\u003e\n  \u003cli\u003eDue to our outstanding coating technique, we offer a \u003cstrong\u003e10-year guarantee\u003c\/strong\u003e on all of our filters.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eYou get the highest quality possible with every single Astronomik filter to be able to take perfect images with your instruments! Especially the filters against light pollution and the narrowband-emission line filters will expand your imaging possibilities enormously! You are investing your money in an accessory that will work for many years in the same way it did when it was brand new. Due to our special coating technique, the filters do not degrade when getting older, and due to the new MFR coating, you will be able to use the filter on nearly all instruments!\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eTypical questions asked by customers looking for Narrowband-Emission line Filters:\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003e\u003cstrong\u003eWhich is the best full-width-half-maximum for me? 12nm or 6nm?\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eIf you have a camera with an extremely low dark current and effective cooling, the 6nm filters will give you major advantages: Due to the stronger blocking of the background, you will be able to expose longer and get deeper images! All stars are very tiny points, most faint stars do not show up anymore! -This is a major advantage even for normal cameras, as you can take images of faint structures even in star-crowded regions of the Milky Way!\u003cbr\u003e\nIn summary, 12nm filters are the right choice for all DSLRs and dark-current limited cameras.\u003cbr\u003e\n6nm filters are the best choice for observing sites with extremely strong light pollution, cameras with low dark-current, and when weak objects require the maximum contrast and star-reduction possible!\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003e\u003cstrong\u003eHow much is exposure time increased?\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eThe answer is simple: You don't have to expose longer, but you CAN! Due to the high transmission of approximately 100% at the center wavelength, nearly all emission line photons reach the sensor. The number of H-alpha-photons, for example, does not change significantly whether an H-alpha filter is installed or not. However, looking at the photons of other wavelengths that we do NOT want to record makes the effect of the filter clear: The combination of very good blocking of all unwanted light from UV up to the IR and the narrow bandwidth of the filters reduces all unwanted signals on the sensor! If you do an exposure of 30 seconds without any filters from a light-polluted urban observing site, your sky background might be very bright or even saturated. The same image taken with a Narrowband-Emission line filter will give you a perfect black background without any signal, and the signal from the object will be about the same. With this black background, you have the possibility to expose longer—probably 30 minutes instead—to record fainter structures!\u003c\/p\u003e\n","brand":"Astronomik","offers":[{"title":"Default Title","offer_id":41821320904881,"sku":"8H11LE","price":627.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0523\/1650\/4241\/files\/astronomik-oiii-6nm-ccd-maxfr-clip-filter-nikon-z-xl-593019.jpg?v=1718364248"},{"product_id":"astronomik-oiii-6nm-ccd-maxfr-31mm-filter-optimal-for-fast-systems","title":"Astronomik OIII 6nm CCD MaxFR 31mm Filter – Optimal for Fast Systems","description":"\u003ch1\u003eAstronomik OIII 6nm CCD MaxFR 31mm Filter – Fast Optical Systems\u003c\/h1\u003e\n\n\u003ch4\u003eAstronomik Narrowband Filters for Extremely Fast Optical Systems\u003c\/h4\u003e\n\n\u003cp\u003eThere is increasing demand for filters designed for extremely fast optical systems, such as Celestron’s RASA and Takahashi’s Epsilon Astrographs. The Astronomik MaxFR series is specifically crafted to meet the requirements of deep-sky imaging, supporting fast optical systems. You can choose between 12nm and 6nm bandwidths (FWHM) for key emission lines like oxygen (OIII), hydrogen (H-alpha), and sulfur (SII).\u003c\/p\u003e\n\n\u003ch4\u003eMaxFR OIII-CCD Filter\u003c\/h4\u003e\n\n\u003cp\u003eThe MaxFR OIII-CCD filter is available in both 6nm and 12nm bandwidths, offering optimal transmission for narrowband imaging. This filter ensures maximum contrast and detail capture, even in heavily light-polluted environments.\u003c\/p\u003e\n\n\u003ch4\u003eMaxFR H-alpha-CCD Filter\u003c\/h4\u003e\n\n\u003cp\u003eThe MaxFR H-alpha-CCD filter is perfect for capturing the rich red emission lines from nebulae. With bandwidth options of 6nm and 12nm, you can select the filter that suits your imaging setup best.\u003c\/p\u003e\n\n\u003ch4\u003eMaxFR SIII-CCD Filter\u003c\/h4\u003e\n\n\u003cp\u003eThe MaxFR SIII-CCD filter rounds out the set of essential filters for astrophotographers. Available in 6nm and 12nm bandwidths, this filter enhances the capture of sulfur emission lines, providing the depth and contrast needed for Hubble-like images.\u003c\/p\u003e\n\n\u003ch4\u003eHighest Transmission for Fast Systems\u003c\/h4\u003e\n\n\u003cp\u003eThe MaxFR filters are built using advanced MFR Coating technology to block out-of-band wavelengths while providing excellent contrast, reduced stray light, and no halos. These filters are specifically designed for use with fast optical systems, ensuring needle-sharp stars and optimal data quality.\u003c\/p\u003e\n\n\u003cul\u003e\n\t\u003cli\u003e\n\u003cstrong\u003e12nm Filters:\u003c\/strong\u003e Usable with systems from f\/1.7 to f\/8, providing about 85% transmission at f\/1.4.\u003c\/li\u003e\n\t\u003cli\u003e\n\u003cstrong\u003e6nm Filters:\u003c\/strong\u003e Usable from f\/2.2 to f\/8, with approximately 90% transmission at f\/2.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch4\u003eEnhanced Imaging for Light-Polluted Environments\u003c\/h4\u003e\n\n\u003cp\u003eWhen imaging from light-polluted areas, narrowband filters like the MaxFR series can dramatically improve image quality. H-alpha filters are ideal for capturing nebulae that glow red, while OIII and SII filters enhance imaging possibilities by revealing structures in greenish and blueish tones. Using these filters together allows you to create Hubble Space Telescope-like images, even in challenging conditions.\u003c\/p\u003e\n\n\u003ch4\u003eQuality Features of Astronomik MaxFR Filters\u003c\/h4\u003e\n\n\u003cul\u003e\n\t\u003cli\u003e\n\u003cstrong\u003eMFR Coating:\u003c\/strong\u003e Offers perfect performance with all instruments down to f\/1.4 (12nm filters) and f\/2 (6nm filters).\u003c\/li\u003e\n\t\u003cli\u003e\n\u003cstrong\u003eHigh-Quality Substrate:\u003c\/strong\u003e Made with striae-free, optically polished glass, ensuring no image distortion.\u003c\/li\u003e\n\t\u003cli\u003e\n\u003cstrong\u003eParfocal:\u003c\/strong\u003e All Astronomik filters are parfocal, meaning you won’t need to adjust your focus when switching filters.\u003c\/li\u003e\n\t\u003cli\u003e\n\u003cstrong\u003eDurability:\u003c\/strong\u003e Scratch-resistant, moisture-proof, and age-resistant coating ensures long-lasting performance.\u003c\/li\u003e\n\t\u003cli\u003e\n\u003cstrong\u003eBlocking:\u003c\/strong\u003e Blocks unwanted light from UV to IR wavelengths, eliminating the need for additional UV\/IR blocking filters.\u003c\/li\u003e\n\t\u003cli\u003e\n\u003cstrong\u003eAvailable Sizes:\u003c\/strong\u003e From 1.25\" to square 50mm x 50mm filters.\u003c\/li\u003e\n\t\u003cli\u003eComes with a high-quality protective storage box.\u003c\/li\u003e\n\t\u003cli\u003e10-year guarantee for full performance and durability.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch4\u003eChoosing the Right Filter for Your Setup\u003c\/h4\u003e\n\n\u003cp\u003eIf you’re using a DSLR or camera with limited dark current, the 12nm filters are an excellent choice. For extreme light pollution or if your camera has very low dark current, the 6nm filters offer the best contrast and star reduction, perfect for faint structures in star-crowded regions of the Milky Way.\u003c\/p\u003e\n\n\u003ch4\u003eExposure Time and Imaging\u003c\/h4\u003e\n\n\u003cp\u003eWhile you don’t need to increase exposure time, the MaxFR filters allow you to extend exposures to capture fainter details. Thanks to high transmission rates, the filters block unwanted wavelengths, ensuring your images are not overexposed. This means you can expose for longer (up to 30 minutes) and capture more detail.\u003c\/p\u003e\n\n\u003ch4\u003eSelection Guide\u003c\/h4\u003e\n\n\u003cp\u003eSelect the appropriate size and bandwidth (FWHM) to find the MaxFR filter best suited for your setup. Enhance your deep-sky imaging results with Astronomik filters today.\u003c\/p\u003e\n","brand":"Astronomik","offers":[{"title":"Default Title","offer_id":41821331816625,"sku":"8H11F5","price":304.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0523\/1650\/4241\/files\/astronomik-oiii-6nm-ccd-maxfr-31mm-388436.jpg?v=1718364255"},{"product_id":"astronomik-oiii-6nm-ccd-maxfr-36mm-filter-for-deep-sky-imaging","title":"Astronomik OIII 6nm CCD MaxFR 36mm Filter for Deep-Sky Imaging","description":"\u003ch1\u003eAstronomik OIII 6nm CCD MaxFR 36mm\u003c\/h1\u003e\n\u003ch4\u003eMaxFR Astronomik photographic narrowband-emission line filters for fast optical systems\u003c\/h4\u003e\n\u003cp\u003eThere is an ever-growing demand for filters suitable for extremely fast optical systems like Celestron's RASA and the Epsilon Astrographs made by Takahashi.\u003c\/p\u003e\n\u003cp\u003eOur novel MaxFR emission line filters are suitable for very fast focal ratios. The new Astronomik MaxFR series of narrowband-emission line filters is perfectly matched to the requirements of astronomical deep-sky imaging with fast optical systems. For the three most important emission lines of oxygen (OIII), hydrogen (H-alpha), and sulfur (SII), you can select filters with either 12nm or 6nm Bandwidth (FWHM).\u003c\/p\u003e\n\u003ch4\u003eMaxFR OIII-CCD filter\u003c\/h4\u003e\n\u003cp\u003e6nm and 12nm FWHM\u003c\/p\u003e\n\u003ch4\u003eMaxFR H-alpha-CCD filter\u003c\/h4\u003e\n\u003cp\u003e6nm and 12nm FWHM\u003c\/p\u003e\n\u003ch4\u003eMaxFR SIII-CCD filter\u003c\/h4\u003e\n\u003cp\u003e6nm and 12nm FWHM\u003c\/p\u003e\n\u003ch4\u003eHighest Transmission\u003c\/h4\u003e\n\u003cp\u003eOur new MaxFR filters are made in a completely new way, designed to work perfectly with fast optical systems. The well-known MFR Coating technique gives you the best out-of-band blocking possible across the entire range of wavelengths from the UV up to IR! This new design offers extremely high contrast, minimized stray light, no halos, and needle-sharp stars. Astronomik MFR narrowband-emission line filters provide the best data quality, giving you excellent start material for processing into stunning final images!\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eFor 12nm MaxFR filters, unlimited usability from f\/1.7 to f\/8, and about 85% of the maximum transmission at f\/1.4 as guaranteed.\u003c\/li\u003e\n\u003cli\u003eFor 6nm MaxFR filters, unlimited usability from f\/2.2 to f\/8, with about 90% of the maximum transmission at f\/2 as guaranteed performance data.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eFor maximum contrast, the SII filter is carefully designed to block all light coming from H-alpha and NII (nitrogen).\u003c\/p\u003e\n\u003ch4\u003eImaging with Narrowband-Emission Line Filters\u003c\/h4\u003e\n\u003cp\u003eIf you observe from light-polluted sites, imaging with narrowband-emission line filters is the best way to capture great images, as all kinds of light pollution can be effectively blocked. Normally, an H-alpha filter should be your first step into astrophotography. With a Narrowband H-alpha filter, you will take deep and contrasting images even under heavy light pollution or when the full moon is in the sky! OIII filters expand your imaging possibilities, allowing you to image all greenish\/blueish structures like planetary nebulae and star-forming regions. The SII filter completes your HSO filter set, enabling you to process your images in ways similar to the Hubble Space Telescope!\u003c\/p\u003e\n\u003ch4\u003eQuality aspects of the new Astronomik MFR narrowband-emission line filters:\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMFR Coating:\u003c\/strong\u003e The 12nm filters can be used on all instruments down to f\/1.4, the 6nm filters down to f\/2.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh-Quality Substrate:\u003c\/strong\u003e Astronomik filters are made with stress-free, optically polished glass. The filter itself is made of ultra-thin layers on this substrate!\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eParfocal Filters:\u003c\/strong\u003e All Astronomik Filters are Parfocal! Due to the very small thickness-tolerance, the focal plane is not shifted when changing filters.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCoating:\u003c\/strong\u003e Astronomik filters are made of up to 170 layers, coated on both sides of the substrate. These layers act as an Anti-Reflection Coating.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDurability:\u003c\/strong\u003e Astronomik filters are highly scratch-resistant, moisture-resistant, and will not degrade over time. Every Astronomik filter delivers full performance and meets specifications even after years of use.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIntegrated Blocking:\u003c\/strong\u003e All unwanted light is blocked across the entire spectral range from UV to IR! You will not need an additional UV\/IR-Blocker when imaging with any of our new narrowband-emission line filters.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWide range of available sizes\u003c\/strong\u003e – from 1.25\" up to square 50mm x 50mm filters.\u003c\/li\u003e\n\u003cli\u003eDelivered in a \u003cstrong\u003ehigh-quality protection \u0026amp; storage box\u003c\/strong\u003e.\u003c\/li\u003e\n\u003cli\u003eThanks to our coating technique, we offer a \u003cstrong\u003e10-year guarantee\u003c\/strong\u003e on all our filters.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eYou will get the highest quality possible with every single Astronomik filter, enabling perfect images with your instruments! Especially with filters against light pollution and narrowband-emission line filters, your imaging possibilities will expand enormously. You are investing in an accessory that will continue working for years as it did when new. Due to our special coating technique, the filters do not degrade over time, and the MFR coating ensures compatibility with nearly all instruments!\u003c\/p\u003e\n\u003ch4\u003eCommon Questions from Customers\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eWhich is the best full-width-half-maximum for me? 12nm or 6nm?\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThere is no \"right\" or \"wrong\" choice here. If you have a camera with low dark current and effective cooling, the 6nm filters offer advantages: the stronger background blocking allows for longer exposures and deeper images. Stars will appear as tiny points, and many faint stars will not be visible, allowing you to capture faint structures even in star-crowded regions. The 12nm filters are ideal for all DSLRs and dark-current-limited cameras, while the 6nm filters are best for extreme light pollution, low-dark-current cameras, and when weak objects require maximum contrast and star-reduction.\u003c\/p\u003e\n\u003ch4\u003eHow much is exposure time increased?\u003c\/h4\u003e\n\u003cp\u003eWhile exposure times don't need to be longer, they can be! With high transmission at the center wavelength, nearly all emission line photons reach the sensor, so the number of \"H-alpha-photons\" doesn't change much whether or not a filter is used. However, blocking unwanted light from UV to IR reduces the background signal, allowing you to expose longer – perhaps 30 minutes instead of 30 seconds – to record fainter structures.\u003c\/p\u003e\n\u003ch4\u003eFilter Selection\u003c\/h4\u003e\n\u003cp\u003eSelect the appropriate size and FWHM to find the right filters for your setup.\u003c\/p\u003e","brand":"Astronomik","offers":[{"title":"Default Title","offer_id":41821332832433,"sku":"8H11F6","price":358.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0523\/1650\/4241\/files\/astronomik-oiii-6nm-ccd-maxfr-36mm-180407.jpg?v=1718364222"},{"product_id":"astronomik-oiii-6nm-ccd-maxfr-50mm-high-contrast-imaging","title":"Astronomik OIII 6nm CCD MaxFR 50mm – High Contrast Imaging","description":"\u003ch1\u003eAstronomik OIII 6nm CCD MaxFR 50mm\u003c\/h1\u003e\n\u003ch4\u003eMaxFR Astronomik photographic narrowband-emissionline filters for fast optical systems\u003c\/h4\u003e\n\u003ch4\u003eThere is an ever-growing demand for filters suitable for extremely fast optical systems like Celestron’s RASA and the Epsilon Astrographs made by Takahashi.\u003c\/h4\u003e\n\u003ch4\u003eOur novel MaxFR emission line filters are suitable up to very fast focal ratios. The new Astronomik MaxFR series of narrowband-emissionline filters is perfectly matched to the requirements of astronomical deep-sky imaging with fast optical systems. For the three most important emission lines of oxygen (OIII), hydrogen (H-alpha), and sulfur (SII) you may select your filters either with 12nm or 6nm Bandwidth (FWHM).\u003c\/h4\u003e\n\u003cp\u003e\u003cstrong\u003eMaxFR OIII-CCD filter\u003cbr\u003e\u003cspan\u003e6nm and 12nm FWHM\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMaxFR H-alpha-CCD filter\u003c\/strong\u003e\u003cbr\u003e\u003cspan\u003e6nm and 12nm FWHM\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMaxFR SIII-CCD filter\u003cbr\u003e6nm and 12nm FWHM\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eHighest transmission:\u003c\/strong\u003e\u003c\/span\u003e\u003cbr\u003eOur new MaxFR filters are made in a completely new way, designed to work perfectly with fast optical systems. The built-in well-known MFR Coating technique gives you the best out-of-band blocking possible across the entire range of wavelengths from the UV up to IR! Your advantage of our new design is an \u003cstrong\u003eextremely high contrast\u003c\/strong\u003e, minimized stray light,\u003cstrong\u003e no halos\u003c\/strong\u003e, and \u003cstrong\u003eneedle-sharp stars\u003c\/strong\u003e. The Astronomik MFR narrowband-emissionline filters give you the best quality of data: The best start material to be processed into an awesome final image!\u003cbr\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eFor 12nm MaxFR filters this means unlimited usability from f\/1.7 to f\/8 and about 85% of the maximum transmission at f\/1.4 as guaranteed.\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eFor 6nm MaxFR filters this means unlimited usability from f\/2.2 to f\/8 with about 90% of the maximum transmission at f\/2 as guaranteed performance data.\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eFor maximum contrast, the SII filter is carefully designed to block all light coming from H-alpha and NII (nitrogen).\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eImaging with Narrowband-Emissionline Filters\u003c\/strong\u003e\u003cbr\u003eIf you have to observe from light-polluted sites (like most of us...), imaging with narrowband-emission line filters is the best way to take great images, as all kinds of light pollution can be blocked very effectively! Normally, an H-alpha filter should be your first step into this amazing field of Astrophotography! With a Narrowband H-alpha filter, you will be able to take deep and contrasting images even with very heavy light pollution or with the full moon high up in the sky!\u003cbr\u003eIf you look at other astrophotographs, an H-alpha is the best choice for all nebula glowing red! An OIII filter expands your imaging possibilities, as you are able to image all greenish\/blueish structures. Planetary nebulae and star-forming regions are great targets! The SII filters complete your HSO-set of filters. With these three filters, you are able to process your images like the ones from the Hubble space telescope!\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQuality aspects of the new Astronomik MFR narrowband-emission line filters:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMFR Coating:\u003c\/strong\u003e The 12nm Filters can be used on all instruments down to f\/1.4, the 6nm filters down to f\/2.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh-Quality substrate:\u003c\/strong\u003e Astronomik filters are made with stress- and striae-free, optically polished glass. The filter itself is made of ultra-thin layers on this substrate!\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eParfocal filters:\u003c\/strong\u003e All Astronomik Filters are Parfocal! Due to the very small thickness-tolerance, the focal plane is not shifted when changing filters!\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCoating:\u003c\/strong\u003e Astronomik filters are made of up to 170 layers, which are coated on both sides of the substrate. These layers form the filter itself and act as an Anti-Reflection Coating.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDurability:\u003c\/strong\u003e Due to our coating technique, all Astronomik filters are highly scratch-resistant, not sensitive to moisture, and do not degrade with time. Every Astronomik filter will deliver its full performance and meet the specs at the point of shipping even after many years.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIntegrated Blocking:\u003c\/strong\u003e All unwanted light is blocked in the whole spectral range from UV up to the IR! (You will not need an additional UV \u0026amp; IR-Blocker when imaging with any of our new narrowband-emission line filters with MFR coating!)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWide range of available sizes:\u003c\/strong\u003e from 1.25\" up to square 50mm x 50mm filters.\u003c\/li\u003e\n\u003cli\u003eDelivered in a \u003cstrong\u003ehigh-quality protection \u0026amp; storage box\u003c\/strong\u003e.\u003c\/li\u003e\n\u003cli\u003eDue to our outstanding coating technique, we offer a \u003cstrong\u003e10-year guarantee\u003c\/strong\u003e on all of our filters.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eYou get the highest quality possible with every single Astronomik filter to be able to take perfect images with your instruments! Especially the filters against light pollution and the narrowband-emission line filters will enormously expand your imaging possibilities! You are investing your money in an accessory that will work for many years in the same way it did when it was brand new. Due to our special coating technique, the filters do not degrade when getting older, and due to the new MFR coating, you will be able to use the filter on nearly all instruments!\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eTypical questions asked by customers looking for Narrowband-Emission line Filters:\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eWhich is the best full-width-half-maximum for me? 12nm or 6nm?\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe question of which full-width-half-maximum (FWHM) is the \"best\" shows up often. A general \"right\" or \"wrong\" or \"best\" answer does not make sense. We would not offer both series if they were not needed.\u003cbr\u003eIf you have a camera with an extremely low dark current and effective cooling, the 6nm filters will give you major advantages: Due to the stronger blocking of the background, you will be able to expose longer and get deeper images! All stars are tiny points, and most faint stars do not show up anymore! - This is a major advantage even for normal cameras, as you can take images of faint structures even in star-crowded regions of the Milky Way!\u003cbr\u003eIn short: 12nm Filters are the right choice for all DSLRs and dark-current limited cameras.\u003cbr\u003e6nm filters are the best choice for observing sites with extremely strong light pollution, cameras with low dark current, and when weak objects require the maximum contrast and star-reduction possible!\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eHow much is exposure time increased?\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThis question is asked quite often, and the answer is very simple: You don’t have to expose longer, but you MAY expose longer!\u003cbr\u003eDue to the high transmission of approximately 100% at the center wavelength, nearly all emission line photons reach the sensor. So, the number of, for example, \"H-alpha-photons\" does not change significantly whether an H-alpha filter is installed or not. But looking at the photons of other wavelengths, which we do NOT want to record, makes the effect of the filter clear: The combination of very good blocking of all unwanted light from UV up to the IR and the narrow bandwidth of the filters reduces all unwanted signals on the sensor! If you do a 30 sec exposure without any filters from a light-polluted urban observing site, your sky background might be already very, very bright or even saturated. The same image taken with a Narrowband Emission line filter will give you a perfect black background without any unwanted signals, and the signal from the object will be about the same. With this black background, you have the possibility to expose longer - probably 30 min instead - to record fainter structures! 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The new Astronomik MaxFR series of narrowband-emission line filters is perfectly matched to the requirements of astronomical deep-sky imaging with fast optical systems. For the three most important emission lines of oxygen (OIII), hydrogen (H-alpha), and sulfur (SII), you may select your filters either with 12nm or 6nm Bandwidth (FWHM).\u003c\/h4\u003e\n\n\u003cp\u003e\u003cstrong\u003eMaxFR OIII-CCD filter\u003cbr\u003e\n\u003cspan\u003e6nm and 12nm FWHM\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eMaxFR H-alpha-CCD filter\u003c\/strong\u003e\u003cbr\u003e\n\u003cspan\u003e6nm and 12nm FWHM\u003c\/span\u003e\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eMaxFR SIII-CCD filter\u003cbr\u003e\n6nm and 12nm FWHM\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eHighest transmission:\u003c\/strong\u003e\u003c\/span\u003e\u003cbr\u003e\nOur new MaxFR filters are made in a completely new way, designed to work perfectly with fast optical systems. The built-in well-known MFR Coating technique gives you the best out-of-band blocking possible across the entire range of wavelengths from the UV up to IR! Your advantage of our new design is \u003cstrong\u003eextremely high contrast\u003c\/strong\u003e, minimized stray light, \u003cstrong\u003eno halos\u003c\/strong\u003e, and \u003cstrong\u003eneedle-sharp stars\u003c\/strong\u003e. The Astronomik MFR narrowband-emission line filters give you the best quality of data: the best start material to be processed to an awesome final image!\u003c\/p\u003e\n\n\u003cul\u003e\n    \u003cli\u003e\u003cstrong\u003eFor 12nm MaxFR filters this means unlimited usability from f\/1.7 to f\/8 and about 85% of the maximum transmission at a f\/1.4 as guaranteed.\u003c\/strong\u003e\u003c\/li\u003e\n    \u003cli\u003e\u003cstrong\u003eFor 6nm MaxFR filters this means unlimited usability from f\/2.2 to f\/8 with about 90% of the maximum transmission at a f\/2 as guaranteed performance data.\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eFor maximum contrast, the SII filter is carefully designed to block all light coming from H-alpha and NII (nitrogen).\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eImaging with Narrowband-Emissionline Filters\u003c\/strong\u003e\u003cbr\u003e\nIf you have to observe from light-polluted sites, imaging with narrowband-emission line filters is the best way to take great images, as all kinds of light pollution can be blocked very effectively! Normally, an H-alpha filter should be your first step into this amazing field of astrophotography! With a Narrowband H-alpha filter, you will be able to take deep and contrasting images even with very heavy light pollution or with the full moon high up in the sky!\u003c\/p\u003e\n\n\u003cp\u003eIf you look at other astrophotographs, an H-alpha filter is the best choice for all nebulae glowing red! An OIII filter expands your imaging possibilities, as you are able to image all greenish\/bluish structures. Planetary nebulae and star-forming regions are great targets! The SII filter completes your HSO-set of filters. With these three filters, you are able to process your images like the ones from the Hubble Space Telescope!\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQuality aspects of the new Astronomik MFR narrowband-emission line filters:\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cul\u003e\n    \u003cli\u003e\n\u003cstrong\u003eMFR Coating:\u003c\/strong\u003e The 12nm filters can be used on all instruments down to f\/1.4, the 6nm filters down to f\/2.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eHigh-Quality substrate:\u003c\/strong\u003e Astronomik filters are made with stress- and striae-free, optically polished glass. The filter itself is made of ultra-thin layers on this substrate!\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eParfocal filters:\u003c\/strong\u003e All Astronomik Filters are Parfocal! Due to the very small thickness-tolerance, the focal plane is not shifted when changing filters!\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eCoating:\u003c\/strong\u003e Astronomik filters are made of up to 170 layers which are coated on both sides of the substrate. These layers form the filter itself and act as an Anti-Reflection Coating.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eDurability:\u003c\/strong\u003e Due to our coating technique, all Astronomik filters are highly scratch-resistant, not sensitive to moisture, and do not degrade when getting older. Every Astronomik filter will deliver its full performance and meet the specs at the point of shipping even after years.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eIntegrated Blocking:\u003c\/strong\u003e All unwanted light is blocked in the whole spectral range from UV up to the IR! (You will not need an additional UV \u0026amp; IR-Blocker when imaging with any of our new narrowband-emission line filters with MFR coating!)\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eWide range of available sizes:\u003c\/strong\u003e From 1.25\" up to square 50mm x 50mm filters.\u003c\/li\u003e\n    \u003cli\u003eDelivered in a \u003cstrong\u003ehigh-quality protection \u0026amp; storage box\u003c\/strong\u003e.\u003c\/li\u003e\n    \u003cli\u003eDue to our outstanding coating technique, we offer a \u003cstrong\u003e10-year guarantee\u003c\/strong\u003e on all of our filters.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eYou get the highest quality possible with every single Astronomik filter to take perfect images with your instruments! Especially the filters against light pollution and the narrowband-emission line filters will expand your imaging possibilities enormously! You are investing your money in an accessory which will work for many years in the same way it did when it was brand new. Due to our special coating technique, the filters do not degrade when getting older, and due to the new MFR coating, you will be able to use the filter on nearly all instruments!\u003c\/p\u003e\n\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eTypical questions asked by customers looking for Narrowband-Emission line Filters:\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\n\u003cul\u003e\n    \u003cli\u003e\u003cstrong\u003eWhich is the best full-width-half-maximum for me? 12nm or 6nm?\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eThe question which full-width-half-maximum (FWHM) is the \"best\" comes up very often. A general \"right\" or \"wrong\" or \"best\" answer does not make sense. We would not offer both series if they were not needed.\u003c\/p\u003e\n\n\u003cp\u003eIf you have a camera with an extremely low dark current and effective cooling, the 6nm filters will give you major advantages: due to the stronger blocking of the background, you will be able to expose longer and get deeper images! All stars are very tiny points, and most faint stars do not show up anymore. This is a major advantage even for normal cameras, as you can take images of faint structures even in star-crowded regions of the Milky Way!\u003c\/p\u003e\n\n\u003cp\u003eTo put it simply: 12nm Filters are the right choice for all DSLRs and dark-current limited cameras. 6nm filters are the best choice for observing sites with extremely strong light pollution, cameras with low dark current, and when weak objects require the maximum contrast and star-reduction possible!\u003c\/p\u003e\n\n\u003cul\u003e\n    \u003cli\u003e\u003cstrong\u003eHow much is exposure time increased?\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eYou don't have to expose longer, but you MAY expose longer! Due to the high transmission of approximately 100% at the center wavelength, nearly all emission line photons reach the sensor. The combination of very good blocking of unwanted light and the narrow bandwidth of the filters reduces all unwanted signal on the sensor, allowing for longer exposures without increasing unwanted background signals.\u003c\/p\u003e\n\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eSelection of filters:\u003c\/strong\u003e\u003c\/span\u003e\u003cbr\u003e\nPlease select the matching size for your setup and the FWHM to get a list of all available filters.\u003c\/p\u003e\n","brand":"Astronomik","offers":[{"title":"Default Title","offer_id":41821388931249,"sku":"8H11EE","price":241.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0523\/1650\/4241\/files\/astronomik-h-alpha-6nm-ccd-maxfr-125-m285-402500.jpg?v=1718364237"},{"product_id":"astronomik-h-alpha-6nm-ccd-maxfr-2-m48-filter-for-fast-optics","title":"Astronomik H-alpha 6nm CCD MaxFR 2\" (M48) Filter for Fast Optics","description":"\u003ch1\u003eAstronomik H-alpha 6nm CCD MaxFR 2'' (M48)\u003c\/h1\u003e\n\n\u003ch4\u003eMaxFR Astronomik photographic narrowband-emissionline filters for fast optical systems.\u003c\/h4\u003e\n\n\u003ch4\u003e There is an ever-growing demand for filters suitable for extremely fast optical systems like Celestron’s RASA and the Epsilon Astrographs made by Takahashi.\u003c\/h4\u003e\n\n\u003ch4\u003eOur novel MaxFR emission line filters are suitable up to very fast focal ratios. The new Astronomik MaxFR series of narrowband-emissionline filters is perfectly matched to the requirements of astronomical deep-sky imaging with fast optical systems. For the three most important emission lines of oxygen (OIII), hydrogen (H-alpha), and sulfur (SII), you may select your filters either with 12nm or 6nm Bandwidth (FWHM).\u003c\/h4\u003e\n\n\u003cp\u003e\u003cstrong\u003eMaxFR OIII-CCD filter\u003cbr\u003e \u003cspan\u003e6nm and 12nm FWHM\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eMaxFR H-alpha-CCD filter\u003c\/strong\u003e\u003cbr\u003e \u003cspan\u003e6nm and 12nm FWHM\u003c\/span\u003e\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003e MaxFR SIII-CCD filter\u003cbr\u003e 6nm and 12nm FWHM\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eHighest transmission:\u003c\/strong\u003e\u003c\/span\u003e\u003cbr\u003e Our new MaxFR filters are made in a completely new way, designed to work perfectly with fast optical systems. The built-in, well-known MFR Coating technique gives you the best out-of-band blocking possible across the entire range of wavelengths from UV up to IR! Your advantage of our new design is extremely high contrast, minimized stray light, no halos, and needle-sharp stars. The Astronomik MFR narrowband-emissionline filters give you the best quality of data: The best start material to be processed into an awesome final image!\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eFor 12nm MaxFR filters this means unlimited usability from f\/1.7 to f\/8 and about 85% of the maximum transmission at f\/1.4 is guaranteed.\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eFor 6nm MaxFR filters this means unlimited usability from f\/2.2 to f\/8 with about 90% of the maximum transmission at f\/2 is guaranteed performance data.\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eFor maximum contrast, the SII filter is carefully designed to block all light coming from H-alpha and NII (nitrogen).\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eImaging with Narrowband-Emissionline Filters\u003c\/strong\u003e\u003cbr\u003e If you have to observe from light-polluted sites (like most of us...), imaging with narrowband-emission line filters is the best way to take great images, as all kinds of light pollution can be blocked very effectively! Normally an H-alpha filter should be your first step into this amazing field of Astrophotography! With a Narrowband H-alpha filter, you will be able to take deep and contrasting images even with very heavy light pollution or with the full moon high up in the sky! If you look at other Astrophotosgraphs, an H-alpha is the best choice for all nebula glowing red! An OIII filter expands your imaging possibilities, as you are able to image all greenish\/bluish structures. Planetary nebulae and star-forming regions are great targets! The SII filter completes your HSO set of filters. With these three filters, you are able to process your images like the ones from the Hubble space telescope!\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQuality aspects of the new Astronomik MFR narrowband-emission line filters:\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMFR Coating:\u003c\/strong\u003e The 12nm Filters can be used on all instruments down to f\/1.4, the 6nm filters down to f\/2.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh-Quality substrate:\u003c\/strong\u003e Astronomik filters are made with stress- and striae-free, optically polished glass. The filter itself is made of ultra-thin layers on this substrate!\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eParfocal filters:\u003c\/strong\u003e All Astronomik Filters are Parfocal! Due to the very small thickness-tolerance, the focal plane is not shifted when changing filters!\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCoating:\u003c\/strong\u003e Astronomik filters are made of up to 170 layers which are coated on both sides of the substrate. These layers form the filter itself and act as an Anti-Reflection Coating.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDurability:\u003c\/strong\u003e Due to our coating technique, all Astronomik filters are highly scratch-resistant, not sensitive to moisture, and do not degrade when getting older. Every Astronomik filter will deliver its full performance and meet the specs at the point of shipping even after lots of years.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIntegrated Blocking:\u003c\/strong\u003e All unwanted light is blocked in the whole spectral range from UV up to the IR! (You will not need an additional UV \u0026amp; IR-Blocker when imaging with any of our new narrowband-emission line filters with coating!)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWide range of available sizes\u003c\/strong\u003e from 1.25\" up to square 50mm x 50mm filters.\u003c\/li\u003e\n\u003cli\u003eDelivered in a\u003cstrong\u003e high-quality protection \u0026amp; storage box.\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eDue to our outstanding coating technique, we offer a\u003cstrong\u003e 10-year guarantee\u003c\/strong\u003e on all of our filters.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eYou get the highest quality possible with every single Astronomik filter to be able to take perfect images with your instruments! Especially the filters against light pollution and the narrowband-emission line filters will expand your imaging possibilities enormously! You are investing your money in an accessory that will work for lots of years in the same way it did when it was brand new. Due to our special coating technique, the filters do not degrade when getting older, and due to the new MFR coating, you will be able to use the filter on nearly all instruments!\u003c\/p\u003e\n\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eTypical questions asked by customers looking for Narrowband-Emission line Filters:\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eWhich is the best full-width-half-maximum for me? 12nm or 6nm?\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eThe question of which full-width-half-maximum (FWHM) is the \"best\" shows up in emails on our monitor or when talking to customers at fairs very often. A general \"right,\" \"wrong,\" or \"best\" does not make any sense. We would not offer both series if they were not needed. If you have a camera with an extremely low dark current and effective cooling, the 6nm filters will give you major advantages: Due to the stronger blocking of the background, you will be able to expose longer and get deeper images! All stars are very tiny points, and most faint stars do not show up anymore! -This is a major advantage even for normal cameras, as you can take images of faint structures even in star-crowded regions of the Milky Way! To put it shortly: 12nm Filters are the right choice for all DSLR`s and dark-current-limited cameras. 6nm filters are the best choice for observing sites with extremely strong light pollution, cameras with low dark-current, and when weak objects require the maximum contrast and star-reduction possible!\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eHow much is exposure time increased?\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eThis question is asked quite often, and the answer is very easy: You don’t have to expose longer, but you MAY expose longer! Due to the high transmission of approximately 100% at the center wavelength, nearly all emission line photons reach the sensor. So the number of, for example, \"H-alpha-photons\" does not change significantly whether an H-alpha filter is installed or not. But looking at the photons of other wavelengths, which we do NOT want to record makes the effect of the filter clear: The combination of very good blocking of all unwanted light from UV up to the IR and the narrow bandwidth of the filters reduces all unwanted signals on the sensor! If you do an exposure of 30 sec without any filters from a light-polluted urban observing site, your sky background might be already very, very bright or even saturated. The same image taken with a Narrowband -Emission line filter will give you a perfect black background without any signal, and the signal from the object will be about the same. With this black background, you have the possibility to expose longer -probably 30 min instead- to record fainter structures! So it’s not a \"must,\" it’s a \"can\".\u003c\/p\u003e\n\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eSelection of filters:\u003c\/strong\u003e\u003c\/span\u003e\u003cbr\u003e Please select the matching size for your setup and the FWHM to get a list of all available filters.\u003c\/p\u003e\n","brand":"Astronomik","offers":[{"title":"Default Title","offer_id":41821391225009,"sku":"8H11F0","price":582.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0523\/1650\/4241\/files\/astronomik-h-alpha-6nm-ccd-maxfr-2-m48-686151.jpg?v=1718364223"},{"product_id":"astronomik-h-alpha-6nm-ccd-maxfr-clip-filter-for-eos-aps-c-cameras","title":"Astronomik H-alpha 6nm CCD MaxFR Clip-Filter for EOS APS-C Cameras","description":"\u003ch1\u003eAstronomik H-alpha 6nm CCD MaxFR Clip-Filter EOS APS-C\u003c\/h1\u003e\n\n\u003ch4\u003eMaxFR Astronomik photographic narrowband-emission line filters for fast optical systems.\u003c\/h4\u003e\n\n\u003ch4\u003eThere is an ever-growing demand for filters suitable for extremely fast optical systems like Celestron's RASA and the Takahashi Epsilon Astrographs.\u003c\/h4\u003e\n\n\u003ch4\u003eOur novel MaxFR emission line filters are suitable for very fast focal ratios. The new Astronomik MaxFR series of narrowband-emission line filters is perfectly matched to the requirements of astronomical deep-sky imaging with fast optical systems. For the three most important emission lines—oxygen (OIII), hydrogen (H-alpha), and sulfur (SII)—you may select filters with either 12nm or 6nm bandwidth (FWHM).\u003c\/h4\u003e\n\n\u003cp\u003e\u003cstrong\u003eHighest transmission:\u003c\/strong\u003e\u003cbr\u003e\nOur new MaxFR filters are designed to work perfectly with fast optical systems. The MFR Coating technique provides the best out-of-band blocking possible across the range of wavelengths from UV to IR. The new design offers \u003cstrong\u003eextremely high contrast\u003c\/strong\u003e, minimized stray light, \u003cstrong\u003eno halos\u003c\/strong\u003e, and \u003cstrong\u003eneedle-sharp stars\u003c\/strong\u003e. Astronomik MFR narrowband-emission line filters provide the best data quality for producing stunning final images.\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e12nm MaxFR filters:\u003c\/strong\u003e Usable from f\/1.7 to f\/8, with about 85% maximum transmission at f\/1.4 guaranteed.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e6nm MaxFR filters:\u003c\/strong\u003e Usable from f\/2.2 to f\/8, with about 90% maximum transmission at f\/2 guaranteed.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eFor maximum contrast, the SII filter is carefully designed to block all light from H-alpha and NII (nitrogen).\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eImaging with Narrowband-Emission Line Filters\u003c\/strong\u003e\u003cbr\u003e\nNarrowband-emission line filters are perfect for observing from light-polluted areas. H-alpha filters should be your first step into narrowband astrophotography, allowing deep, contrast-rich images even in severe light pollution or under a full moon. H-alpha filters are ideal for capturing red-glowing nebulae. OIII filters enable imaging of greenish-blue structures, such as planetary nebulae and star-forming regions. SII filters complete your HSO set, letting you process your images like those taken by the Hubble Space Telescope!\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQuality aspects of the new Astronomik MFR narrowband-emission line filters:\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cul\u003e\n    \u003cli\u003e\n\u003cstrong\u003eMFR Coating:\u003c\/strong\u003e Use 12nm filters on systems as fast as f\/1.4, and 6nm filters as fast as f\/2.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eHigh-Quality substrate:\u003c\/strong\u003e Made from stress- and striae-free, optically polished glass. The filters consist of ultra-thin layers on the substrate.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eParfocal filters:\u003c\/strong\u003e All Astronomik filters are parfocal, with thickness tolerances that prevent the focal plane from shifting when changing filters.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eCoating:\u003c\/strong\u003e Coated on both sides with up to 170 layers for anti-reflection properties.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eDurability:\u003c\/strong\u003e Scratch-resistant, moisture-proof, and designed to last for years without degradation. Every Astronomik filter will deliver full performance and meet specifications even after years of use.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eIntegrated Blocking:\u003c\/strong\u003e Complete blocking from UV to IR, eliminating the need for additional UV \u0026amp; IR blockers.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eAvailable Sizes:\u003c\/strong\u003e From 1.25\" to 50mm x 50mm square filters.\u003c\/li\u003e\n    \u003cli\u003eDelivered in a \u003cstrong\u003ehigh-quality protection \u0026amp; storage box.\u003c\/strong\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003e10-year guarantee\u003c\/strong\u003e thanks to our outstanding coating technique.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eYou’ll get the highest quality with every Astronomik filter, enhancing your imaging possibilities. These filters provide long-lasting performance, working as well as when they were brand new. With our special coating, the filters do not degrade over time, and the MFR coating ensures compatibility with nearly all optical systems.\u003c\/p\u003e\n","brand":"Astronomik","offers":[{"title":"Default Title","offer_id":41821394403505,"sku":"8H11DQ","price":358.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0523\/1650\/4241\/files\/astronomik-h-alpha-6nm-ccd-maxfr-clip-filter-eos-aps-c-814499.jpg?v=1718364261"},{"product_id":"astronomik-h-alpha-6nm-ccd-maxfr-clip-filter-for-eos-xl-cameras","title":"Astronomik H-alpha 6nm CCD MaxFR Clip-Filter for EOS XL Cameras","description":"\u003ch1\u003eAstronomik H-alpha 6nm CCD MaxFR Clip-Filter EOS XL\u003c\/h1\u003e\n\u003ch4\u003eMaxFR Astronomik photographic narrowband-emission line filters for fast optical systems.\u003c\/h4\u003e\n\u003ch4\u003eThere is an ever-growing demand for filters suitable for extremely fast optical systems like Celestron's RASA and the Epsilon Astrographs made by Takahashi.\u003c\/h4\u003e\n\u003ch4\u003eOur novel MaxFR emission line filters are suitable for very fast focal ratios. The new Astronomik MaxFR series of narrowband-emission line filters is perfectly matched to the requirements of astronomical deep-sky imaging with fast optical systems. For the three most important emission lines—oxygen (OIII), hydrogen (H-alpha), and sulfur (SII)—you may select filters with either 12nm or 6nm bandwidth (FWHM)\u003c\/h4\u003e\n\u003cp\u003e\u003cstrong\u003eMaxFR OIII-CCD filter\u003c\/strong\u003e\u003cbr\u003e\u003cspan\u003e6nm and 12nm FWHM\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMaxFR H-alpha-CCD filter\u003c\/strong\u003e\u003cbr\u003e\u003cspan\u003e6nm and 12nm FWHM\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMaxFR SIII-CCD filter\u003c\/strong\u003e\u003cbr\u003e\u003cspan\u003e6nm and 12nm FWHM\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eHighest transmission:\u003c\/strong\u003e\u003c\/span\u003e\u003cbr\u003eOur new MaxFR filters are made in a completely new way, designed to work perfectly with fast optical systems. The built-in, well-known MFR Coating technique gives you the best out-of-band blocking possible across the entire range of wavelengths from UV to IR! Your advantage is \u003cstrong\u003eextremely high contrast\u003c\/strong\u003e, minimized stray light, \u003cstrong\u003eno halos\u003c\/strong\u003e, and \u003cstrong\u003eneedle-sharp stars\u003c\/strong\u003e. The Astronomik MFR narrowband-emission line filters provide the best quality data, making them the ideal starting material for an awesome final image!\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e12nm MaxFR filters:\u003c\/strong\u003e Usable from f\/1.7 to f\/8, with about 85% maximum transmission at f\/1.4 guaranteed.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e6nm MaxFR filters:\u003c\/strong\u003e Usable from f\/2.2 to f\/8, with about 90% maximum transmission at f\/2 guaranteed.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eFor maximum contrast, the SII filter is carefully designed to block all light from H-alpha and NII (nitrogen).\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eImaging with Narrowband-Emission Line Filters\u003c\/strong\u003e\u003cbr\u003eImaging with narrowband-emission line filters is the best way to take great images from light-polluted sites, as they effectively block all kinds of light pollution. An H-alpha filter should be your first step into narrowband astrophotography! You can capture deep and contrast-rich images, even with heavy light pollution or a full moon in the sky. H-alpha is perfect for capturing nebulae glowing red! An OIII filter expands your imaging capabilities by allowing you to capture greenish\/blueish structures, like planetary nebulae and star-forming regions. The SII filter completes your HSO filter set, letting you process your images like those from the Hubble Space Telescope.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQuality aspects of the new Astronomik MFR narrowband-emission line filters:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMFR Coating:\u003c\/strong\u003e The 12nm filters work on systems as fast as f\/1.4, and the 6nm filters as fast as f\/2.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh-Quality substrate:\u003c\/strong\u003e Made from stress- and striae-free, optically polished glass. The filters consist of ultra-thin layers on the substrate.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eParfocal filters:\u003c\/strong\u003e All Astronomik filters are parfocal, with thickness tolerances that prevent the focal plane from shifting when changing filters.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCoating:\u003c\/strong\u003e Coated on both sides with up to 170 layers for anti-reflection properties.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDurability:\u003c\/strong\u003e Scratch-resistant, moisture-proof, and designed to last for years without degradation. Every Astronomik filter will deliver full performance and meet specifications even after years of use.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIntegrated Blocking:\u003c\/strong\u003e Complete blocking from UV to IR, eliminating the need for additional UV \u0026amp; IR blockers.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAvailable Sizes:\u003c\/strong\u003e From 1.25\" to 50mm x 50mm square filters.\u003c\/li\u003e\n\u003cli\u003eDelivered in a \u003cstrong\u003ehigh-quality protection \u0026amp; storage box\u003c\/strong\u003e.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e10-year guarantee\u003c\/strong\u003e thanks to our outstanding coating technique.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eYou’ll get the highest quality with every Astronomik filter, enhancing your imaging possibilities. These filters provide long-lasting performance, working as well as when they were brand new. With our special coating, the filters do not degrade over time, and the MFR coating ensures compatibility with nearly all optical systems.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFrequently Asked Questions:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eWhich is the best full-width-half-maximum for me—12nm or 6nm?\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eIt depends on your setup. For DSLR cameras and dark-current-limited cameras, 12nm filters are ideal. For extreme light pollution and cameras with low dark current, 6nm filters provide better contrast and star reduction, making them suitable for deep imaging.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eHow does exposure time change with narrowband filters?\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eUsing narrowband filters doesn’t necessarily require longer exposure times, but you can extend exposure to record fainter details without unwanted light interference. 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The Astronomik MaxFR series of narrowband-emission line filters is perfectly matched to the requirements of astronomical deep-sky imaging with fast optical systems. For the three most important emission lines—oxygen (OIII), hydrogen (H-alpha), and sulfur (SII)—you may select filters with either 12nm or 6nm bandwidth (FWHM).\u003c\/h4\u003e\n\n\u003cp\u003e\u003cstrong\u003eHighest transmission:\u003c\/strong\u003e\u003cbr\u003e\nOur new MaxFR filters are designed to work perfectly with fast optical systems. The MFR Coating technique provides the best out-of-band blocking possible across the range of wavelengths from UV to IR. The new design offers \u003cstrong\u003eextremely high contrast\u003c\/strong\u003e, minimized stray light, \u003cstrong\u003eno halos\u003c\/strong\u003e, and \u003cstrong\u003eneedle-sharp stars\u003c\/strong\u003e. Astronomik MFR narrowband-emission line filters provide the best data quality for producing stunning final images.\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e12nm MaxFR filters:\u003c\/strong\u003e Usable from f\/1.7 to f\/8, with about 85% maximum transmission at f\/1.4 guaranteed.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e6nm MaxFR filters:\u003c\/strong\u003e Usable from f\/2.2 to f\/8, with about 90% maximum transmission at f\/2 guaranteed.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eFor maximum contrast, the SII filter is carefully designed to block all light from H-alpha and NII (nitrogen).\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eImaging with Narrowband-Emission Line Filters\u003c\/strong\u003e\u003cbr\u003e\nNarrowband-emission line filters are perfect for observing from light-polluted areas. H-alpha filters should be your first step into narrowband astrophotography, allowing deep, contrast-rich images even in severe light pollution or under a full moon. H-alpha filters are ideal for capturing red-glowing nebulae. OIII filters enable imaging of greenish-blue structures, such as planetary nebulae and star-forming regions. SII filters complete your HSO set, letting you process your images like those taken by the Hubble Space Telescope!\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQuality aspects of the new Astronomik MFR narrowband-emission line filters:\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cul\u003e\n    \u003cli\u003e\n\u003cstrong\u003eMFR Coating:\u003c\/strong\u003e Use 12nm filters on systems as fast as f\/1.4, and 6nm filters as fast as f\/2.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eHigh-Quality substrate:\u003c\/strong\u003e Made from stress- and striae-free, optically polished glass. 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With our special coating, the filters do not degrade over time, and the MFR coating ensures compatibility with nearly all optical systems.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eFrequently Asked Questions:\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eWhich is the best FWHM for me – 12nm or 6nm?\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eIt depends on your setup. For DSLR cameras and dark-current-limited cameras, 12nm filters are ideal. 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The new Astronomik MaxFR series of narrowband-emissionline filters is perfectly matched to the requirements of astronomical deep-sky imaging with fast optical systems. 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The built-in well-known MFR Coating technique gives you the best out-of-band blocking possible across the entire range of wavelengths from the UV up to IR! Your advantage of our new design is \u003cstrong\u003eextremely high contrast\u003c\/strong\u003e, minimized stray light, \u003cstrong\u003eno halos\u003c\/strong\u003e, and \u003cstrong\u003eneedle-sharp stars\u003c\/strong\u003e. 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Normally, an H-alpha filter should be your first step into this amazing field of Astrophotography! With a Narrowband H-alpha filter, you will be able to take deep and contrasting images even with very heavy light pollution or with the full moon high up in the sky!\u003cbr\u003e\nIf you look at other astrophotographs, an H-alpha filter is the best choice for all nebula glowing red! An OIII filter expands your imaging possibilities, as you are able to image all greenish\/blueish structures. Planetary nebulae and star-forming regions are great targets! The SII filter completes your HSO-set of filters. With these three filters, you are able to process your images like the ones from the Hubble Space Telescope!\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQuality aspects of the new Astronomik MFR narrowband-emission line filters:\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cul\u003e\n\t\u003cli\u003e\n\u003cstrong\u003eMFR Coating:\u003c\/strong\u003e The 12nm Filters can be used on all instruments down to f\/1.4, the 6nm filters down to f\/2.\u003c\/li\u003e\n\t\u003cli\u003e\n\u003cstrong\u003eHigh-Quality substrate:\u003c\/strong\u003e Astronomik filters are made with stress- and striae-free, optically polished glass. The filter itself is made of ultra-thin layers on this substrate!\u003c\/li\u003e\n\t\u003cli\u003e\n\u003cstrong\u003eParfocal filters:\u003c\/strong\u003e All Astronomik Filters are Parfocal! Due to the very small thickness tolerance, the focal plane is not shifted when changing filters!\u003c\/li\u003e\n\t\u003cli\u003e\n\u003cstrong\u003eCoating:\u003c\/strong\u003e Astronomik filters are made of up to 170 layers, which are coated on both sides of the substrate. These layers form the filter itself and act as an Anti-Reflection Coating.\u003c\/li\u003e\n\t\u003cli\u003e\n\u003cstrong\u003eDurability:\u003c\/strong\u003e Due to our coating technique, all Astronomik filters are highly scratch-resistant, not sensitive to moisture, and do not degrade with age. Every Astronomik filter will deliver its full performance and meet the specs at the point of shipping, even after many years.\u003c\/li\u003e\n\t\u003cli\u003e\n\u003cstrong\u003eIntegrated Blocking:\u003c\/strong\u003e All unwanted light is blocked in the whole spectral range from UV up to the IR! 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You are investing your money in an accessory that will work for many years in the same way it did when it was brand new. Due to our special coating technique, the filters do not degrade with age, and with the new MFR coating, you will be able to use the filter on nearly all instruments!\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eTypical questions asked by customers looking for Narrowband-Emission line Filters:\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cul\u003e\n\t\u003cli\u003e\u003cstrong\u003eWhich is the best full-width-half-maximum for me? 12nm or 6nm?\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eThe question of which full-width-half-maximum (FWHM) is the \"best\" shows up often in emails or when talking to customers at fairs. A general \"right,\" \"wrong,\" or \"best\" does not make any sense. We would not offer both series if they were not needed.\u003cbr\u003e\nIf you have a camera with an extremely low dark current and effective cooling, the 6nm filters will give you major advantages: Due to the stronger blocking of the background, you will be able to expose longer and get deeper images! All stars become very tiny points, and most faint stars do not show up anymore! 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So the number of, for example, \"H-alpha-photons\" does not change significantly whether an H-alpha filter is installed or not. But looking at the photons of other wavelengths, which we do NOT want to record, makes the effect of the filter clear: The combination of very good blocking of all unwanted light from UV up to the IR and the narrow bandwidth of the filters reduces all unwanted signal on the sensor! If you do an exposure of 30 sec without any filters from a light-polluted urban observing site, your sky-background might already be very bright or even saturated. The same image taken with a Narrowband Emission line filter will give you a perfect black background without any signal, and the signal from the object will be about the same. With this black background, you have the possibility to expose longer—probably 30 min instead—to record fainter structures! So it’s not a \"must,\" it’s a \"can.\"\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eSelection of filters:\u003c\/strong\u003e\u003cbr\u003e\nPlease select the matching size for your setup and the FWHM to get a list of all available filters.\u003c\/p\u003e\n","brand":"Astronomik","offers":[{"title":"Default Title","offer_id":41821457711281,"sku":"8H11F4","price":627.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0523\/1650\/4241\/files\/astronomik-h-alpha-6nm-ccd-maxfr-clip-filter-sony-alpha-7-302445.jpg?v=1718364246"},{"product_id":"astronomik-h-alpha-6nm-ccd-maxfr-clip-filter-for-nikon-xl-cameras","title":"Astronomik H-alpha 6nm CCD MaxFR Clip-Filter for Nikon XL Cameras","description":"\u003ch1\u003eAstronomik H-alpha 6nm CCD MaxFR Clip-Filter Nikon XL\u003c\/h1\u003e\n\u003ch4\u003eOptimized Narrowband Emission Line Filters for Fast Optical Systems\u003c\/h4\u003e\n\u003cp\u003eExperience unparalleled performance in deep-sky imaging with Astronomik’s MaxFR filters, designed specifically for fast optical systems like Celestron RASA and Takahashi Epsilon Astrographs. These filters are available in 6nm and 12nm bandwidths (FWHM), providing high-contrast imaging for H-alpha, OIII, and SII emission lines.\u003c\/p\u003e\n\n\u003ch3\u003eWhy Choose MaxFR H-alpha, OIII, and SII CCD Filters?\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eAvailable in 6nm and 12nm FWHM for maximum flexibility\u003c\/li\u003e\n\u003cli\u003eDesigned for use with fast optics (f\/1.7 and higher)\u003c\/li\u003e\n\u003cli\u003eHighest contrast with minimized stray light and needle-sharp stars\u003c\/li\u003e\n\u003cli\u003eIdeal for astrophotography of nebulae and planetary nebulae\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eMaximum Contrast and High Transmission\u003c\/h3\u003e\n\u003cp\u003eAstronomik MaxFR filters use advanced MFR Coating technology to provide the best out-of-band blocking, from UV to IR. This technology ensures you experience no halos and maximum contrast, even in heavily light-polluted environments.\u003c\/p\u003e\n\n\u003ch3\u003eImaging with Narrowband Filters\u003c\/h3\u003e\n\u003cp\u003eWhen imaging from light-polluted areas, narrowband filters such as H-alpha and OIII allow you to block unwanted light pollution. H-alpha is perfect for capturing the red glow of nebulae, while OIII brings out the blue-green light of planetary nebulae. Pair these filters with an SII filter to create stunning, Hubble-style images of deep-sky objects.\u003c\/p\u003e\n\n\u003ch3\u003eFeatures of Astronomik Filters\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMFR Coating:\u003c\/strong\u003e Usable on instruments down to f\/1.4 for 12nm filters and f\/2 for 6nm filters\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOptically Polished Glass:\u003c\/strong\u003e Stress-free and striae-free substrate\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eParfocal:\u003c\/strong\u003e No refocusing needed when switching filters\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDurability:\u003c\/strong\u003e Scratch-resistant, moisture-proof, and long-lasting performance\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIntegrated Blocking:\u003c\/strong\u003e Complete UV to IR blocking without additional filters\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAvailable Sizes:\u003c\/strong\u003e From 1.25\" to 50mm square\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eCommon Questions\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eWhich FWHM should I choose, 6nm or 12nm?\u003c\/strong\u003e If you're imaging in heavily light-polluted areas, 6nm offers better contrast, while 12nm allows for more stars in your field of view.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eExpand your astrophotography capabilities with Astronomik MaxFR filters, designed to provide exceptional results even in the most challenging conditions. Perfect for imaging nebulae, planetary nebulae, and star-forming regions with stunning clarity.\u003c\/p\u003e\n","brand":"Astronomik","offers":[{"title":"Default Title","offer_id":41821464199345,"sku":"8H11F3","price":627.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0523\/1650\/4241\/files\/astronomik-h-alpha-6nm-ccd-maxfr-clip-filter-nikon-xl-529309.jpg?v=1718364233"},{"product_id":"astronomik-h-alpha-6nm-ccd-maxfr-clip-filter-nikon-z-xl","title":"Astronomik H-alpha 6nm CCD MaxFR Clip-Filter Nikon Z XL","description":"\u003ch1\u003eAstronomik H-alpha 6nm CCD MaxFR Clip-Filter Nikon Z XL\u003c\/h1\u003e\n\n\u003ch4\u003eMaxFR Astronomik photographic narrowband-emission line filters for fast optical systems.\u003c\/h4\u003e\n\n\u003ch4\u003eThere is an ever-growing demand for filters suitable for extremely fast optical systems like Celestron's RASA or the Epsilon Astrographs made by Takahashi.\u003c\/h4\u003e\n\n\u003ch4\u003eOur novel MaxFR emission line filters are suitable for very fast focal ratios. The new Astronomik MaxFR series of narrowband-emission line filters is perfectly matched to the requirements of astronomical deep-sky imaging with fast optical systems. For the three most important emission lines of oxygen (OIII), hydrogen (H-alpha), and sulfur (SII), you may select your filters either with 12nm or 6nm Bandwidth (FWHM).\u003c\/h4\u003e\n\n\u003cp\u003e\u003cstrong\u003eMaxFR OIII-CCD filter\u003cbr\u003e\n\u003cspan\u003e6nm and 12nm FWHM\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eMaxFR H-alpha-CCD filter\u003c\/strong\u003e\u003cbr\u003e\n\u003cspan\u003e6nm and 12nm FWHM\u003c\/span\u003e\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eMaxFR SII-CCD filter\u003cbr\u003e\n6nm and 12nm FWHM\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eHighest transmission:\u003c\/strong\u003e\u003c\/span\u003e\u003cbr\u003e\nOur new MaxFR filters are made in a completely new way, designed to work perfectly with fast optical systems. The built-in, well-known MFR Coating technique gives you the best out-of-band blocking possible across the entire range of wavelengths from the UV up to IR! Your advantage with our new design is \u003cstrong\u003eextremely high contrast\u003c\/strong\u003e, minimized stray light, \u003cstrong\u003eno halos\u003c\/strong\u003e, and \u003cstrong\u003eneedle-sharp stars\u003c\/strong\u003e. The Astronomik MFR narrowband-emission line filters give you the best quality data: the best start material to be processed into an awesome final image!\u003cbr\u003e\n\u003c\/p\u003e\n\n\u003cul\u003e\n    \u003cli\u003e\u003cstrong\u003eFor 12nm MaxFR filters, this means unlimited usability from f\/1.7 to f\/8, and about 85% of the maximum transmission at f\/1.4 as guaranteed.\u003c\/strong\u003e\u003c\/li\u003e\n    \u003cli\u003e\u003cstrong\u003eFor 6nm MaxFR filters, this means unlimited usability from f\/2.2 to f\/8 with about 90% of the maximum transmission at f\/2 as guaranteed performance data.\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eFor maximum contrast, the SII filter is carefully designed to block all light coming from H-alpha and NII (nitrogen).\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eImaging with Narrowband-Emission Line Filters\u003c\/strong\u003e\u003cbr\u003e\nIf you have to observe from light-polluted sites (like most of us...), imaging with narrowband-emission line filters is the best way to take great images, as all kinds of light pollution can be effectively blocked! Normally, an H-alpha filter should be your first step into this amazing field of Astrophotography! With a Narrowband H-alpha filter, you will be able to take deep and contrasting images even with very heavy light pollution or with the full moon high up in the sky!\u003cbr\u003e\nIf you look at other astrophotographs, an H-alpha filter is the best choice for all nebulae glowing red! An OIII filter expands your imaging possibilities, as you are able to image all greenish\/blueish structures. Planetary nebulae and star-forming regions are great targets! The SII filter completes your HSO-set of filters. With these three filters, you can process your images like the ones from the Hubble Space Telescope!\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQuality aspects of the new Astronomik MFR narrowband-emission line filters:\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cul\u003e\n    \u003cli\u003e\n\u003cstrong\u003eMFR Coating:\u003c\/strong\u003e The 12nm filters can be used on all instruments down to f\/1.4, and the 6nm filters down to f\/2.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eHigh-Quality substrate:\u003c\/strong\u003e Astronomik filters are made with stress- and striae-free, optically polished glass. The filter itself is made of ultra-thin layers on this substrate!\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eParfocal filters:\u003c\/strong\u003e All Astronomik Filters are Par focal! Due to the very small thickness-tolerance, the focal plane is not shifted when changing filters!\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eCoating:\u003c\/strong\u003e Astronomik filters are made of up to 170 layers, which are coated on both sides of the substrate. These layers form the filter itself and act as an Anti-Reflection Coating.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eDurability:\u003c\/strong\u003e Due to our coating technique, all Astronomik filters are highly scratch-resistant, not sensitive to moisture, and do not degrade with age. Every Astronomik filter will deliver full performance and meet the specs at the point of shipping, even after lots of years.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eIntegrated Blocking:\u003c\/strong\u003e All unwanted light is blocked in the entire spectral range from UV up to the IR! 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You are investing your money in an accessory that will work in the same way it did when it was brand new. Due to our special coating technique, the filters do not degrade with age, and due to the new MFR coating, you will be able to use the filter on nearly all instruments!\u003c\/p\u003e\n\n\u003cp\u003e\u003c\/p\u003e\n\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eTypical questions asked by customers looking for Narrowband-Emission line Filters:\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\n\u003cul\u003e\n    \u003cli\u003e\u003cstrong\u003eWhich is the best full-width-half-maximum for me? 12nm or 6nm?\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eThe question of which full-width-half-maximum (FWHM) is the \"best\" shows up in emails or when talking to customers at fairs very often. A general \"right\" or \"wrong\" or \"best\" does not make any sense. We would not offer both series if they were not needed.\u003cbr\u003e\nIf you have a camera with an extremely low dark current and effective cooling, the 6nm filters will give you major advantages: Due to the stronger blocking of the background, you will be able to expose longer and get deeper images! All stars are tiny points, and most faint stars do not show up anymore! -This is a major advantage even for normal cameras, as you can take images of faint structures even in star-crowded regions of the Milky Way!\u003cbr\u003e\nTo put it short: 12nm Filters are the right choice for all DSLRs and dark-current-limited cameras.\u003cbr\u003e\n6nm filters are the best choice for observing sites with extremely strong light pollution, cameras with low dark-current, and when weak objects require the maximum contrast and star-reduction possible!\u003c\/p\u003e\n\n\u003cul\u003e\n    \u003cli\u003e\u003cstrong\u003eHow much is exposure time increased?\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eThis question is asked quite often, and the answer is very easy: You don't have to expose longer, but you MAY expose longer!\u003cbr\u003e\nDue to the high transmission of approximately 100% at the center wavelength, nearly all emission line photons reach the sensor. So the number of, for example, \"H-alpha-photons\" does not change significantly whether an H-alpha filter is installed or not. But looking at the photons of other wavelengths, which we do NOT want to record, makes the effect of the filter clear: The combination of very good blocking of all unwanted light from UV up to the IR and the narrow bandwidth of the filters reduces all unwanted signal on the sensor! If you do a 30-second exposure without any filters from a light-polluted urban observing site, your sky-background might already be very, very bright or even saturated. The same image taken with a Narrowband Emission line filter will give you a perfect black background without any signal, and the signal from the object will be about the same. With this black background, you have the possibility to expose longer - probably 30 min instead - to record fainter structures! 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This means you’ll start with the best raw data, ensuring stunning final images.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e12nm Filters:\u003c\/strong\u003e Fully usable from f\/1.7 to f\/8 with around 85% transmission at f\/1.4.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e6nm Filters:\u003c\/strong\u003e Fully usable from f\/2.2 to f\/8 with about 90% transmission at f\/2.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eFor maximum contrast, the SII filter blocks unwanted H-alpha and NII (nitrogen) light effectively.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhy Choose Narrowband Filters?\u003c\/strong\u003e\u003cbr\u003eNarrowband filters are a great solution for imaging in light-polluted areas. An H-alpha filter should be your first step into this type of astrophotography. It enables deep and contrast-rich images, even under heavy light pollution or a full moon. H-alpha filters are ideal for capturing nebulae that emit red light. The OIII filter allows you to capture greenish-blue structures, such as planetary nebulae and star-forming regions. With the SII filter, you’ll complete the HSO set for Hubble Space Telescope-style imaging!\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAstronomik MFR Filters: Uncompromising Quality\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMFR Coating:\u003c\/strong\u003e Use 12nm filters on systems as fast as f\/1.4 and 6nm filters as fast as f\/2.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh-Quality Glass:\u003c\/strong\u003e Astronomik filters use striae-free, optically polished glass for minimal distortion.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eParfocal:\u003c\/strong\u003e No refocusing is needed when switching filters due to precise thickness tolerances.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDurability:\u003c\/strong\u003e These filters are scratch-resistant, moisture-proof, and built to last without performance degradation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eComprehensive Blocking:\u003c\/strong\u003e Complete blocking from UV to IR wavelengths.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAvailable Sizes:\u003c\/strong\u003e From 1.25\" to 50mm x 50mm square filters.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGuaranteed Performance:\u003c\/strong\u003e Every filter includes a 10-year guarantee.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eInvest in the best: Astronomik filters are designed to expand your imaging capabilities while delivering lasting value. They perform exceptionally well, even after many years of use, ensuring that your filters provide the same quality as the day you bought them.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFrequently Asked Questions:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003e12nm or 6nm? What’s the difference?\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eIt depends on your setup. 12nm filters are the best choice for DSLRs and dark-current-limited cameras, while 6nm filters are better for extreme light pollution and cameras with low dark current, allowing deeper imaging and star reduction.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eDoes using narrowband filters require longer exposure times?\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eWhile you don't have to extend exposure times, using narrowband filters allows you to do so without unwanted light interference. 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The Astronomik MaxFR series of narrowband-emission line filters is perfectly matched to the requirements of astronomical deep-sky imaging with fast optical systems. For the three most important emission lines—oxygen (OIII), hydrogen (H-alpha), and sulphur (SII)—you may select filters with either 12nm or 6nm bandwidth (FWHM).\u003c\/h4\u003e\n\u003cp\u003e\u003cstrong\u003eHighest transmission:\u003c\/strong\u003e\u003cbr\u003eOur new MaxFR filters are designed to work perfectly with fast optical systems. The MFR Coating technique provides the best out-of-band blocking possible across the range of wavelengths from UV to IR. The new design offers \u003cstrong\u003eextremely high contrast\u003c\/strong\u003e, minimized stray light, \u003cstrong\u003eno halos\u003c\/strong\u003e, and \u003cstrong\u003eneedle-sharp stars\u003c\/strong\u003e. Astronomik MFR narrowband-emission line filters provide the best data quality for producing stunning final images.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e12nm MaxFR filters:\u003c\/strong\u003e Usable from f\/1.7 to f\/8, with about 85% maximum transmission at f\/1.4 guaranteed.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e6nm MaxFR filters:\u003c\/strong\u003e Usable from f\/2.2 to f\/8, with about 90% maximum transmission at f\/2 guaranteed.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eFor maximum contrast, the SII filter is carefully designed to block all light from H-alpha and NII (nitrogen).\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eImaging with Narrowband-Emission Line Filters\u003c\/strong\u003e\u003cbr\u003eNarrowband-emission line filters are perfect for observing from light-polluted areas. H-alpha filters should be your first step into narrowband astrophotography, allowing deep, contrast-rich images even in severe light pollution or under a full moon. H-alpha filters are ideal for capturing red-glowing nebulae. OIII filters enable imaging of greenish-blue structures, such as planetary nebulae and star-forming regions. SII filters complete your HSO set, letting you process your images like those taken by the Hubble Space Telescope!\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQuality aspects of the new Astronomik MFR narrowband-emission line filters:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMFR Coating:\u003c\/strong\u003e The 12nm filters work on systems as fast as f\/1.4, and the 6nm filters down to f\/2.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh-Quality substrate:\u003c\/strong\u003e Made from stress- and striae-free, optically polished glass. The filters consist of ultra-thin layers on the substrate.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eParfocal filters:\u003c\/strong\u003e All Astronomik filters are parfocal, with thickness tolerances that prevent the focal plane from shifting when changing filters.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCoating:\u003c\/strong\u003e Coated on both sides with up to 170 layers for anti-reflection properties.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDurability:\u003c\/strong\u003e Scratch-resistant, moisture-proof, and designed to last for years without degradation. Every Astronomik filter will deliver full performance and meet specifications even after years of use.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIntegrated Blocking:\u003c\/strong\u003e Complete blocking from UV to IR, eliminating the need for additional UV \u0026amp; IR blockers.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAvailable Sizes:\u003c\/strong\u003e From 1.25\" to 50mm x 50mm square filters.\u003c\/li\u003e\n\u003cli\u003eDelivered in a \u003cstrong\u003ehigh-quality protection \u0026amp; storage box.\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e10-year guarantee\u003c\/strong\u003e thanks to our outstanding coating technique.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eYou’ll get the highest quality with every Astronomik filter, enhancing your imaging possibilities. These filters provide long-lasting performance, working as well as when they were brand new. With our special coating, the filters do not degrade over time, and the MFR coating ensures compatibility with nearly all optical systems.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFrequently Asked Questions:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eWhich is the best FWHM for me – 12nm or 6nm?\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eIt depends on your setup. For DSLR cameras and dark-current-limited cameras, 12nm filters are ideal. For extreme light pollution and cameras with low dark current, 6nm filters provide better contrast and star reduction, making them suitable for deep imaging.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eHow does exposure time change with narrowband filters?\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eUsing narrowband filters doesn’t necessarily require longer exposure times, but you can extend exposure to record fainter details without unwanted light interference. This results in clearer images, even from light-polluted areas.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMaxFR Filters for Fast Optical Systems\u003c\/strong\u003e\u003cbr\u003eChoose the size and FWHM that fit your setup, and start capturing stunning deep-sky images today.\u003c\/p\u003e","brand":"Astronomik","offers":[{"title":"Default Title","offer_id":41821481402545,"sku":"8H11BC","price":591.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0523\/1650\/4241\/files\/astronomik-h-alpha-6nm-ccd-maxfr-50mm-959430.jpg?v=1718364252"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0523\/1650\/4241\/collections\/astronomik-6nm-maxfr-filters-for-astrophotography-870662.jpg?v=1730873188","url":"https:\/\/www.darkclearskies.co.uk\/collections\/astronomik-6nm-maxfr-filters-for-astrophotography.oembed","provider":"Dark Clear Skies ","version":"1.0","type":"link"}