{"title":"Featured Astronomik Equipment","description":null,"products":[{"product_id":"astronomik-oiii-12nm-ccd-maxfr-2-m48-high-contrast-nebula-filter","title":"Astronomik OIII 12nm CCD MaxFR 2'' (M48) - High Contrast Nebula Filter","description":"\u003ch1\u003eAstronomik OIII 12nm CCD MaxFR 2'' (M48)\u003c\/h1\u003e\n\u003cp\u003e\u003cstrong\u003eThe Astronomik OIII-CCD Filter is ideal for imaging OIII nebulae from light-polluted locations or dark skies. It dramatically enhances contrast between objects glowing at 501nm and their background, giving you clear, high-quality images.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eWith a narrow bandwidth of 12nm and typical transmission of 96%, this filter effectively blocks unwanted light from UV to IR, providing a dark background and maximizing contrast. This makes it perfect for imaging nebulae and other faint objects, especially in light-polluted areas. Unlike narrower 6nm filters, this 12nm version allows more stars to be visible in the field of view, providing more guiding stars for astrophotography with integrated or dual guiding chips.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDesigned with MFR coating technology, the filter performs optimally with all instruments up to f\/3 without significant performance loss.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eImportant Note: The Astronomik OIII filter must NOT be used for solar observation.\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch2\u003eTechnical Data:\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eGuaranteed transmission: \u0026gt;90% at the OIII line (501nm)\u003c\/li\u003e\n\u003cli\u003eTypical transmission: 95% at the OIII line (501nm)\u003c\/li\u003e\n\u003cli\u003eFull-Width-Half Maximum (FWHM): 12nm\u003c\/li\u003e\n\u003cli\u003eComplete blocking of unwanted light from UV to IR\u003c\/li\u003e\n\u003cli\u003eParfocal with all other Astronomik filters\u003c\/li\u003e\n\u003cli\u003eMFR coating: Usable with all optics up to f\/3\u003c\/li\u003e\n\u003cli\u003eGlass thickness: 1mm\u003c\/li\u003e\n\u003cli\u003eScratch-resistant and moisture-resistant\u003c\/li\u003e\n\u003cli\u003eOptically polished substrate: Striae-free and free from residual stresses\u003c\/li\u003e\n\u003cli\u003eDelivered in a high-quality storage box\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eImaging with Narrowband Emission Line Filters:\u003c\/h2\u003e\n\u003cp\u003eWhen observing from light-polluted sites, narrowband emission-line filters like the OIII filter are essential for capturing stunning deep-sky images. The OIII filter is perfect for capturing nebulae with a greenish or bluish hue, while the H-alpha filter is ideal for red-emitting nebulae. Combined with an SII filter, you can create false-color images like those produced by the Hubble Space Telescope.\u003c\/p\u003e\n\u003cp\u003eUsing narrowband filters, you can achieve deep, high-contrast images, even in challenging conditions such as heavy light pollution or a full moon. The OIII filter opens up imaging possibilities for planetary nebulae and star-forming regions, providing enhanced contrast and sharper details.\u003c\/p\u003e\n\u003ch2\u003eAdditional Applications:\u003c\/h2\u003e\n\u003cp\u003eBy combining the OIII filter with H-alpha-CCD and SII-CCD filters, you can create Hubble-style false-color images (HSO) even from light-polluted sites. The 12nm bandwidth allows more stars in the field, making it a good choice for regions of the Milky Way with dense star populations.\u003c\/p\u003e\n\u003ch2\u003eAlternatives:\u003c\/h2\u003e\n\u003cp\u003eIf you prefer imaging faint objects in star-crowded regions with shorter focal lengths, consider the 6nm OIII filter. It reduces the number of stars in the field by a factor of two, making it ideal for cameras with low dark current or for observing from heavily light-polluted locations.\u003c\/p\u003e","brand":"Astronomik","offers":[{"title":"Default Title","offer_id":41821271654577,"sku":"8H11H2","price":358.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0523\/1650\/4241\/files\/astronomik-oiii-12nm-ccd-maxfr-2-m48-880359.jpg?v=1782295407"},{"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=1782295434"},{"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=1782295370"},{"product_id":"astronomik-sii-12nm-ccd-maxfr-2-m48-filter-for-fast-optical-systems","title":"Astronomik SII 12nm CCD MaxFR 2'' (M48) Filter for Fast Optical Systems","description":"\u003ch1\u003eAstronomik SII 12nm 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 extremly 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 perfect 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\n\u003cspan\u003e6nm and 12nm FWHM\u003c\/span\u003e\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 an \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-emissionline filters give you the best quality of data: The best start material to be processed to an awesome final image!\u003cbr\u003e\n\u003c\/p\u003e\n\n\u003cul\u003e\n    \u003cli\u003e\n\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\u003cbr\u003e\n\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 nebula glowing red! An OIII filter expands your imaging possibilities, as you are able to image all greenish\/blueish structures. Planetary nebula 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\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 for 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\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\", shows up in Emails on our monitor 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 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!\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 extreme 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 a 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 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\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":41821522264241,"sku":"8H11I9","price":358.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0523\/1650\/4241\/files\/astronomik-sii-12nm-ccd-maxfr-2-m48-198330.jpg?v=1782295452"},{"product_id":"astronomik-deep-sky-rgb-filterset-2-m48-maximize-color-balance","title":"Astronomik Deep-Sky RGB Filterset 2\" (M48) – Maximize Color Balance","description":"\u003cdiv class=\"product-description\"\u003e\n  \u003ch1\u003eAstronomik Deep-Sky RGB Filterset 2\" (M48) – Maximize Color Balance\u003c\/h1\u003e\n\n  \u003cp\u003e\u003cstrong\u003eAstronomik’s Deep-Sky RGB filters\u003c\/strong\u003e are designed for the highest deep-sky imaging performance. These filters offer exceptional sharpness, contrast, and vivid colors, optimized for maximum photon counts on CCD sensors. The filters also allow for easy data processing with vibrant, realistic colors in the final image.\u003c\/p\u003e\n\n  \u003ch4\u003eKey Features:\u003c\/h4\u003e\n\n  \u003cul\u003e\n    \u003cli\u003eUp to 95% transmission for maximum light collection\u003c\/li\u003e\n    \u003cli\u003ePinpoint star images for enhanced sharpness\u003c\/li\u003e\n    \u003cli\u003eHigh contrast and optimized color balance\u003c\/li\u003e\n    \u003cli\u003eEasy-to-process data for vivid colors\u003c\/li\u003e\n    \u003cli\u003eScratch-resistant, durable coating\u003c\/li\u003e\n    \u003cli\u003eSuitable for a wide range of focal ratios\u003c\/li\u003e\n    \u003cli\u003eMade from premium, polished optical glass\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch4\u003eWhy Choose Astronomik Deep-Sky RGB Filters?\u003c\/h4\u003e\n\n  \u003cp\u003eDesigned with cutting-edge coating techniques, these filters are optimized for modern CCD cameras and deliver minimal reflections or halos, even with bright stars in the field of view. Whether you're imaging nebulae or galaxies, these filters will reveal the faintest structures with enhanced contrast and detail.\u003c\/p\u003e\n\n  \u003ch4\u003eCompatibility Across Sensors\u003c\/h4\u003e\n\n  \u003cp\u003eThe Deep-Sky RGB filterset is compatible with a wide range of CCD and CMOS sensors, including Sony chips and KAF\/KAI sensors. The filters enable 1:1:1 ratio RGB exposures with minimal tweaks needed during post-processing, ensuring color balance and precision in every shot.\u003c\/p\u003e\n\n  \u003ch4\u003ePerformance in Light-Polluted Areas\u003c\/h4\u003e\n\n  \u003cp\u003eIf you’re observing under light-polluted skies, consider using Astronomik’s CLS-CCD filter as a replacement for the Luminance filter. This can significantly enhance the quality of your data by blocking artificial light, allowing deeper images even from urban areas.\u003c\/p\u003e\n\n  \u003ch4\u003eTechnical Specifications:\u003c\/h4\u003e\n\n  \u003cul\u003e\n    \u003cli\u003e95% transmission at key wavelengths for deep-sky imaging\u003c\/li\u003e\n    \u003cli\u003eScratch-resistant coating and durable build\u003c\/li\u003e\n    \u003cli\u003eParfocal with other Astronomik filters\u003c\/li\u003e\n    \u003cli\u003eHigh optical performance without reducing image quality\u003c\/li\u003e\n    \u003cli\u003eCompatible with both CCD and DSLR cameras\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003cp\u003eThe Astronomik Deep-Sky RGB Filterset 2\" (M48) is your go-to solution for achieving professional-grade images with vivid colors and maximum contrast. Its advanced design ensures minimal reflections, allowing you to capture breathtaking details of the night sky.\u003c\/p\u003e\n\u003c\/div\u003e\n","brand":"Astronomik","offers":[{"title":"Default Title","offer_id":42046851645617,"sku":"8H00PN","price":520.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0523\/1650\/4241\/files\/astronomik-deep-sky-rgb-filterset-2-m48-3-filters-312517.jpg?v=1782295316"},{"product_id":"astronomik-uhc-2-m48-filter-high-contrast-for-deep-sky-observations","title":"Astronomik UHC 2\" M48 Filter – High Contrast for Deep Sky Observations","description":"\u003cdiv class=\"product-description\"\u003e\n\u003ch1\u003eAstronomik UHC 2\" M48 Filter – Enhance Deep Sky and Planetary Views\u003c\/h1\u003e\n\u003cp\u003e\u003cstrong\u003eThe Astronomik UHC filter is perfect for improving your visual astronomy experience.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eUnlock more stars and hidden details in deep-sky objects with the Astronomik UHC (Ultra High Contrast) filter. It allows nearly 100% transmission of light from O-III and H-beta wavelengths while blocking out unwanted light pollution and scattered light. This makes gas and planetary nebulae more visible and detailed.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cp\u003eThe Astronomik UHC filter enhances deep-sky views, making it ideal even for small telescopes. Its high transmission rate ensures successful observations with telescopes starting at 2\" (50mm) apertures. Optimized for focal ratios between f\/4 and f\/15, the filter provides sharp, distortion-free images.\u003c\/p\u003e\n\u003ch4\u003eBest Uses\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eVisual observation (under dark skies): Great for all telescope sizes, ensuring excellent clarity.\u003c\/li\u003e\n\u003cli\u003eVisual observation (urban areas): Best suited for telescopes with a 100mm or larger aperture.\u003c\/li\u003e\n\u003cli\u003eCCD photography: Works well when paired with an additional IR-block filter.\u003c\/li\u003e\n\u003cli\u003eDSLR photography (astro-modified): Provides near-perfect color balance for deep-sky images.\u003c\/li\u003e\n\u003cli\u003eWebcam\/Video (Deep Sky): Helps reduce light pollution interference in video observations.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eTechnical Details\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e95% transmission at 486nm (H-beta)\u003c\/li\u003e\n\u003cli\u003e95% transmission at 496nm and 501nm (O-III)\u003c\/li\u003e\n\u003cli\u003e95% transmission at 656nm (H-alpha)\u003c\/li\u003e\n\u003cli\u003eOptimized for telescopes with focal ratios from f\/10 to f\/3.5\u003c\/li\u003e\n\u003cli\u003eBlocks unwanted wavelengths of light\u003c\/li\u003e\n\u003cli\u003ePerfect for use with small telescopes\u003c\/li\u003e\n\u003cli\u003eDurable, scratch-resistant, and resistant to moisture and aging\u003c\/li\u003e\n\u003cli\u003eParfocal with other Astronomik filters\u003c\/li\u003e\n\u003cli\u003eGlass thickness: 1mm\u003c\/li\u003e\n\u003cli\u003eComes in a high-quality, protective filter box\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe Astronomik UHC filter is ideal for both beginner and experienced astronomers seeking to improve their deep-sky observations. With excellent transmission and premium build quality, it ensures crystal-clear views and is a versatile addition to your telescope setup.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Astronomik","offers":[{"title":"Default Title","offer_id":42055339770033,"sku":"8H0012","price":179.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0523\/1650\/4241\/files\/astronomik-uhc-2-m48-filter-802175.jpg?v=1782295474"},{"product_id":"astronomik-oiii-filter-high-contrast-for-nebulae-observation","title":"Astronomik OIII Filter – High Contrast for Nebulae Observation","description":"\u003ch1\u003eAstronomik OIII Filter for Visual Observation of Nebulae\u003c\/h1\u003e\n\u003cp\u003e\u003cstrong\u003eThe Astronomik OIII filter is specifically designed for the visual observation of gaseous and planetary nebulae. With its extremely narrow bandpass focused on the two OIII lines, it significantly enhances contrast, even in ideal viewing conditions. The Astronomik OIII filter is a must-have tool for observing faint supernova remnants and planetary nebulae, often making the difference between seeing or missing the object!\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003ch2\u003eMain Use\u003c\/h2\u003e\n\u003cp\u003eThe optimal use for the Astronomik OIII filter is with telescopes with apertures larger than 6\" (150mm) and an aperture ratio between 1:3.7 and 1:15. Astronomik OIII filters ensure excellent transmission and minimal chromatic distortions even in telescopes with very bright aperture ratios of 1:3 and beyond. These filters expand the view across the entire field of view of the eyepiece, offering more than just a centered observation.\u003c\/p\u003e\n\n\u003ch2\u003eBest for Large Apertures\u003c\/h2\u003e\n\u003cp\u003eThis filter is best used with telescopes that have an aperture larger than 6\" (150mm). For experienced Deep Sky observers with telescopes larger than 10\" (250mm), the Astronomik OIII filter is often preferred over UHC filters. The high optical quality of Astronomik substrates guarantees needle-sharp stars without compromising your telescope’s optical performance.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features:\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e95% transmission at 496nm and 501nm (OIII)\u003c\/li\u003e\n  \u003cli\u003eComplete blocking of all unwanted wavelengths\u003c\/li\u003e\n  \u003cli\u003eIdeal for telescopes 10\" (25cm) and larger\u003c\/li\u003e\n  \u003cli\u003eOptimal for planetary nebulae and supernova remnants\u003c\/li\u003e\n  \u003cli\u003eMoisture-resistant, scratch-proof, and long-lasting\u003c\/li\u003e\n  \u003cli\u003eOptically polished substrate ensures no reduction in telescope performance\u003c\/li\u003e\n  \u003cli\u003eParfocal with other Astronomik filters\u003c\/li\u003e\n  \u003cli\u003eGlass thickness: 1mm\u003c\/li\u003e\n  \u003cli\u003eDelivered in a high-quality, durable filter box\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSuitability:\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eVisual observation (dark skies): Excellent, provides significant contrast enhancement for OIII-emission nebulae\u003c\/li\u003e\n  \u003cli\u003eVisual observation (urban skies): Very good, huge contrast enhancement at OIII-emission nebulae\u003c\/li\u003e\n  \u003cli\u003eFilm photography: Requires very long exposure times\u003c\/li\u003e\n  \u003cli\u003eCCD photography: Good, when used with an additional IR-block filter\u003c\/li\u003e\n  \u003cli\u003eDSLR photography (original and astro modified): Very good, offers large contrast improvement for OIII-emission nebulae\u003c\/li\u003e\n  \u003cli\u003eWebcam \/ Video (Deep Sky): Suitable if observing OIII objects with heavy light pollution\u003c\/li\u003e\n\u003c\/ul\u003e\n","brand":"Astronomik","offers":[{"title":"Astronomik OIII visual 1.25\" (M28.5)","offer_id":42055514882225,"sku":null,"price":89.0,"currency_code":"GBP","in_stock":true},{"title":"Astronomik OIII visual 2\" (M48)","offer_id":42055514914993,"sku":null,"price":179.0,"currency_code":"GBP","in_stock":true},{"title":"Astronomik OIII visual SC Rear Cell (2\"\/24 TPI)","offer_id":42055514980529,"sku":null,"price":188.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0523\/1650\/4241\/files\/astronomik-oiii-visual-filters-in-a-variety-of-sizes-478974.jpg?v=1782295439"},{"product_id":"astronomik-cls-ccd-filters","title":"Astronomik CLS CCD filters","description":"\u003cstyle\u003e\n  .dcs-cls {\n    --dcs-navy: #091525;\n    --dcs-gold: #c89524;\n    --dcs-text: #243449;\n    max-width: 1100px;\n    margin: 0 auto;\n    color: var(--dcs-text);\n    font-family: inherit;\n    font-size: 16px;\n    line-height: 1.75;\n  }\n  .dcs-cls * { box-sizing: border-box; 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color: #165581; }\n  .dcs-cls .dcs-oiii { border-color: #16836f; color: #155e51; }\n  .dcs-cls .dcs-ha { border-color: #be4358; color: #943047; }\n  .dcs-cls .dcs-small {\n    font-size: 13px;\n    color: #526275;\n    margin-top: 14px;\n  }\n  .dcs-cls .dcs-two {\n    display: grid;\n    grid-template-columns: repeat(2, minmax(0, 1fr));\n    gap: 18px;\n    margin-bottom: 26px;\n  }\n  .dcs-cls .dcs-two \u003e div {\n    padding: 27px;\n    border-radius: 16px;\n    border: 1px solid #dde5ed;\n    background: #fff;\n  }\n  .dcs-cls .dcs-two h3 { color: #142b43; font-size: 22px; }\n  .dcs-cls ul { padding-left: 21px; margin: 12px 0 0; }\n  .dcs-cls li { margin-bottom: 11px; }\n  .dcs-cls li:last-child { margin-bottom: 0; }\n  .dcs-cls .dcs-note {\n    padding: 26px 28px;\n    background: #fff7e8;\n    border: 1px solid #ecd6a8;\n    border-left: 5px solid var(--dcs-gold);\n    border-radius: 14px;\n    margin-bottom: 26px;\n    color: #59451e;\n  }\n  .dcs-cls .dcs-note h3 { color: #624816; font-size: 22px; }\n  .dcs-cls .dcs-table-wrap {\n    border: 1px solid #dce4ed;\n    border-radius: 15px;\n    overflow: hidden;\n    margin: 18px 0 26px;\n  }\n  .dcs-cls table {\n    border-collapse: collapse;\n    width: 100%;\n    margin: 0;\n    table-layout: fixed;\n    font-size: 14px;\n  }\n  .dcs-cls caption {\n    text-align: left;\n    background: #142b43;\n    color: #fff;\n    padding: 17px 20px;\n    font-size: 18px;\n    font-weight: 700;\n    caption-side: top;\n  }\n  .dcs-cls th,\n  .dcs-cls td {\n    padding: 14px 18px;\n    text-align: left;\n    vertical-align: top;\n    border: 0;\n    border-bottom: 1px solid #e2e8ef;\n    overflow-wrap: anywhere;\n  }\n  .dcs-cls th { width: 39%; color: #183149; font-weight: 600; }\n  .dcs-cls tr:nth-child(even) { background: #f3f6fa; }\n  .dcs-cls tr:last-child th,\n  .dcs-cls tr:last-child td { border-bottom: 0; }\n  .dcs-cls .dcs-faq { margin-bottom: 26px; }\n  .dcs-cls details {\n    background: #f5f7fa;\n    border: 1px solid #dfe6ee;\n    border-radius: 12px;\n    margin-bottom: 10px;\n    padding: 0 20px;\n  }\n  .dcs-cls summary {\n    cursor: pointer;\n    padding: 17px 0;\n    font-weight: 700;\n    color: #183149;\n  }\n  .dcs-cls summary:focus-visible {\n    outline: 2px solid #986d13;\n    outline-offset: 4px;\n  }\n  .dcs-cls details p { padding-bottom: 20px; font-size: 15px; }\n  .dcs-cls .dcs-help {\n    background: #0c1c2f;\n    color: #e8eef6;\n    padding: 30px;\n    border-radius: 18px;\n    border-bottom: 4px solid var(--dcs-gold);\n  }\n  .dcs-cls .dcs-help h3 { color: #fff; }\n  .dcs-cls .dcs-help strong { color: #f0c96c; }\n  @media (max-width: 680px) {\n    .dcs-cls .dcs-grid,\n    .dcs-cls .dcs-two { grid-template-columns: 1fr; }\n    .dcs-cls .dcs-hero { padding: 27px 22px; }\n    .dcs-cls .dcs-panel,\n    .dcs-cls .dcs-note,\n    .dcs-cls .dcs-help { padding: 24px 20px; }\n    .dcs-cls .dcs-lines { gap: 7px; }\n    .dcs-cls .dcs-line { padding: 16px 6px; }\n    .dcs-cls .dcs-line strong { font-size: 21px; }\n    .dcs-cls .dcs-line span { font-size: 12px; }\n    .dcs-cls th,\n    .dcs-cls td { padding: 12px 10px; }\n  }\n\u003c\/style\u003e\n\n\u003cdiv class=\"dcs-cls\"\u003e\n\n  \u003cdiv class=\"dcs-hero\"\u003e\n    \u003cp class=\"dcs-eyebrow\"\u003eASTRONOMIK · DEEP-SKY IMAGING\u003c\/p\u003e\n    \u003ch2\u003eLess skyglow.\u003cbr\u003eMore room for deep-sky detail.\u003c\/h2\u003e\n    \u003cp\u003eThe \u003cstrong\u003eAstronomik CLS CCD filter\u003c\/strong\u003e helps separate faint astronomical targets from a light-polluted background, suppressing selected unwanted wavelengths while transmitting important nebula emission lines.\u003c\/p\u003e\n    \u003cp\u003eWith \u003cstrong\u003eintegrated infrared blocking\u003c\/strong\u003e and compatibility with CMOS, CCD and DSLR cameras, it brings two useful imaging functions together in one optical filter.\u003c\/p\u003e\n    \u003cdiv class=\"dcs-tags\"\u003e\n      \u003cspan class=\"dcs-tag\"\u003eCMOS · CCD · DSLR\u003c\/span\u003e\n      \u003cspan class=\"dcs-tag\"\u003eIntegrated IR blocking\u003c\/span\u003e\n      \u003cspan class=\"dcs-tag\"\u003eH-alpha · H-beta · OIII\u003c\/span\u003e\n      \u003cspan class=\"dcs-tag\"\u003ef\/1.8–f\/15\u003c\/span\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"dcs-grid\"\u003e\n    \u003cdiv class=\"dcs-card dcs-blue\"\u003e\n      \u003cspan class=\"dcs-number\"\u003e01 \/ CONTRAST\u003c\/span\u003e\n      \u003ch3\u003eHelp your target stand out\u003c\/h3\u003e\n      \u003cp\u003eReduces selected wavelengths associated with traditional sodium and mercury lighting, improving the separation between your target and the background sky.\u003c\/p\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"dcs-card dcs-green\"\u003e\n      \u003cspan class=\"dcs-number\"\u003e02 \/ TRANSMISSION\u003c\/span\u003e\n      \u003ch3\u003eKeep valuable nebula signal\u003c\/h3\u003e\n      \u003cp\u003eHigh transmission at H-alpha, H-beta and OIII retains key emission lines, with wider passbands than a UHC filter for less star dimming by comparison.\u003c\/p\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"dcs-card dcs-purple\"\u003e\n      \u003cspan class=\"dcs-number\"\u003e03 \/ INFRARED CONTROL\u003c\/span\u003e\n      \u003ch3\u003eIR blocking built in\u003c\/h3\u003e\n      \u003cp\u003eParticularly useful for infrared-sensitive cameras without their own effective IR-cut filter, including suitable modified DSLR and astronomy camera setups.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"dcs-panel\"\u003e\n    \u003ch3\u003eDesigned around the light you want to capture\u003c\/h3\u003e\n    \u003cp\u003eThe CLS CCD transmits two broad spectral windows: \u003cstrong\u003e450–520nm\u003c\/strong\u003e and \u003cstrong\u003e640–690nm\u003c\/strong\u003e. These include the blue-green emission of H-beta and OIII, together with the deep-red H-alpha emission found in many nebulae.\u003c\/p\u003e\n    \u003cp\u003eIt selectively filters the incoming light to improve contrast where the unwanted skyglow falls within its blocked wavelengths.\u003c\/p\u003e\n\n    \u003cdiv class=\"dcs-lines\"\u003e\n      \u003cdiv class=\"dcs-line dcs-hb\"\u003e\n        \u003cstrong\u003e95%\u003c\/strong\u003e\n        \u003cspan\u003eH-beta\u003c\/span\u003e\n        \u003cspan\u003e486nm\u003c\/span\u003e\n      \u003c\/div\u003e\n      \u003cdiv class=\"dcs-line dcs-oiii\"\u003e\n        \u003cstrong\u003e95%\u003c\/strong\u003e\n        \u003cspan\u003eOIII\u003c\/span\u003e\n        \u003cspan\u003e496 \/ 501nm\u003c\/span\u003e\n      \u003c\/div\u003e\n      \u003cdiv class=\"dcs-line dcs-ha\"\u003e\n        \u003cstrong\u003e97%\u003c\/strong\u003e\n        \u003cspan\u003eH-alpha\u003c\/span\u003e\n        \u003cspan\u003e656nm\u003c\/span\u003e\n      \u003c\/div\u003e\n    \u003c\/div\u003e\n    \u003cp class=\"dcs-small\"\u003eManufacturer-stated transmission at the listed wavelengths. These values do not represent total system throughput.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"dcs-two\"\u003e\n    \u003cdiv\u003e\n      \u003ch3\u003eA useful choice for…\u003c\/h3\u003e\n      \u003cul\u003e\n        \u003cli\u003e\n\u003cstrong\u003eEmission nebula imaging:\u003c\/strong\u003e retains important hydrogen and oxygen emission lines.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eCMOS and CCD cameras:\u003c\/strong\u003e suitable for modern dedicated astronomy cameras, despite the CCD name.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eModified DSLRs:\u003c\/strong\u003e useful where the imaging system needs infrared blocking alongside light pollution suppression.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eUnmodified DSLRs:\u003c\/strong\u003e can improve contrast, with colour correction expected during processing.\u003c\/li\u003e\n      \u003c\/ul\u003e\n    \u003c\/div\u003e\n    \u003cdiv\u003e\n      \u003ch3\u003eCLS CCD or standard CLS?\u003c\/h3\u003e\n      \u003cp\u003e\u003cstrong\u003eThe main difference is infrared blocking.\u003c\/strong\u003e\u003c\/p\u003e\n      \u003cp\u003eChoose the \u003cstrong\u003eCLS CCD\u003c\/strong\u003e when you need light pollution suppression and an IR-cut function in the same filter.\u003c\/p\u003e\n      \u003cp\u003eIf your camera or imaging train already blocks infrared effectively, the \u003cstrong\u003estandard CLS\u003c\/strong\u003e may be a more economical option.\u003c\/p\u003e\n      \u003cp\u003eCheck your camera specification: a protective sensor window does not necessarily provide IR blocking.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"dcs-note\"\u003e\n    \u003ch3\u003eWhat to expect under your skies\u003c\/h3\u003e\n    \u003cp\u003e\u003cstrong\u003ePerformance depends on your local lighting and chosen target.\u003c\/strong\u003e This filter is particularly relevant to the distinct emission lines of traditional sodium and mercury lamps. Broad-spectrum white LED lighting is harder to separate from astronomical signal.\u003c\/p\u003e\n    \u003cp\u003eGalaxies, reflection nebulae and star clusters emit across a broad spectrum, so some useful target light is also removed. Results vary, and colour calibration remains part of the imaging process.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"dcs-table-wrap\"\u003e\n    \u003ctable\u003e\n      \u003ccaption\u003eAstronomik CLS CCD — Technical Specifications\u003c\/caption\u003e\n      \u003ctbody\u003e\n        \u003ctr\u003e\n          \u003cth scope=\"row\"\u003eFilter function\u003c\/th\u003e\n          \u003ctd\u003eLight pollution suppression with integrated infrared blocking\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003cth scope=\"row\"\u003eCamera types\u003c\/th\u003e\n          \u003ctd\u003eCMOS, CCD and DSLR\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003cth scope=\"row\"\u003eTransmission bands\u003c\/th\u003e\n          \u003ctd\u003e450–520nm and 640–690nm\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003cth scope=\"row\"\u003eH-beta transmission\u003c\/th\u003e\n          \u003ctd\u003eApproximately 95% at 486nm\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003cth scope=\"row\"\u003eOIII transmission\u003c\/th\u003e\n          \u003ctd\u003eApproximately 95% at 496nm and 501nm\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003cth scope=\"row\"\u003eH-alpha transmission\u003c\/th\u003e\n          \u003ctd\u003eApproximately 97% at 656nm\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003cth scope=\"row\"\u003eFocal ratio range\u003c\/th\u003e\n          \u003ctd\u003ef\/1.8–f\/15\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003cth scope=\"row\"\u003eOptical glass thickness\u003c\/th\u003e\n          \u003ctd\u003e1mm for standard versions; XT versions differ\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003cth scope=\"row\"\u003eConstruction\u003c\/th\u003e\n          \u003ctd\u003eFinely polished optical glass with durable, scratch-resistant coatings\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003cth scope=\"row\"\u003eEnvironmental resistance\u003c\/th\u003e\n          \u003ctd\u003eCoatings resistant to humidity and ageing\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003cth scope=\"row\"\u003eIncluded accessory\u003c\/th\u003e\n          \u003ctd\u003eProtective filter storage box\u003c\/td\u003e\n        \u003c\/tr\u003e\n      \u003c\/tbody\u003e\n    \u003c\/table\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"dcs-panel\"\u003e\n    \u003ch3\u003eChoose the fitting that matches your equipment\u003c\/h3\u003e\n    \u003cp\u003eThe CLS CCD range includes threaded, unmounted and camera-specific clip formats. \u003cstrong\u003eYour selected variant determines the fitting supplied.\u003c\/strong\u003e\u003c\/p\u003e\n    \u003cp\u003eFor a filter wheel or drawer, check the required diameter, mounting style and clearance. For a clip filter, confirm compatibility with your exact camera body and lens. Threaded 1.25-inch and 2-inch versions require a matching accessory thread.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"dcs-faq\"\u003e\n    \u003ch3\u003eYour questions answered\u003c\/h3\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eDoes “CCD” mean it cannot be used with CMOS cameras?\u003c\/summary\u003e\n      \u003cp\u003eNo. The CLS CCD is suitable for both CMOS and CCD astronomy cameras, as well as DSLRs. The important checks are the filter fitting and the requirements of your imaging system.\u003c\/p\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eDo I need a separate infrared-cut filter?\u003c\/summary\u003e\n      \u003cp\u003eThe CLS CCD includes infrared blocking, so a separate filter is generally unnecessary solely for that function. Check your camera and optical system requirements before choosing your filter combination.\u003c\/p\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWill it preserve the original colour balance?\u003c\/summary\u003e\n      \u003cp\u003eSelective filtration changes the wavelengths reaching your sensor. Allow for colour calibration during processing, particularly with an unmodified DSLR, rather than expecting unchanged colours straight from the camera.\u003c\/p\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWill it remove all light pollution?\u003c\/summary\u003e\n      \u003cp\u003eNo. It suppresses selected wavelengths, so the improvement depends on the lighting around your site. It cannot completely remove broad-spectrum skyglow or replace darker observing conditions.\u003c\/p\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eCan I use it for visual observing?\u003c\/summary\u003e\n      \u003cp\u003eSuitable threaded 1.25-inch and 2-inch versions can be used visually. However, the standard CLS may offer better value because visual observing does not require the CCD version’s infrared blocking.\u003c\/p\u003e\n    \u003c\/details\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"dcs-help\"\u003e\n    \u003cp class=\"dcs-eyebrow\"\u003eDARK CLEAR SKIES\u003c\/p\u003e\n    \u003ch3\u003eThe right filter starts with your setup.\u003c\/h3\u003e\n    \u003cp\u003eUnsure which version to choose? Tell us your \u003cstrong\u003ecamera, telescope or lens, filter holder and preferred targets\u003c\/strong\u003e. We can help you assess whether the CLS CCD is a suitable match and identify the fitting you need.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n\u003c\/div\u003e","brand":"Astronomik","offers":[{"title":"CLS CCD 2\"","offer_id":42072410423473,"sku":"8H00DP-1","price":179.0,"currency_code":"GBP","in_stock":true},{"title":"CLS CCD Clip-Filter EOS APS-C","offer_id":42072410456241,"sku":"8H00DP-2","price":143.0,"currency_code":"GBP","in_stock":true},{"title":"CLS CCD XT Clip-Filter EOS APS-C","offer_id":42072410489009,"sku":"8H00DP-3","price":161.0,"currency_code":"GBP","in_stock":true},{"title":"CLS CCD Clip-Filter EOS XL","offer_id":42072410521777,"sku":"8H00DP-4","price":191.0,"currency_code":"GBP","in_stock":true},{"title":"CLS CCD Clip-Filter EOS R XL","offer_id":42072410554545,"sku":"8H00DP-5","price":223.0,"currency_code":"GBP","in_stock":true},{"title":"CLS CCD Clip-Filter EOS M","offer_id":42072410587313,"sku":"8H00DP-6","price":143.0,"currency_code":"GBP","in_stock":true},{"title":"CLS CCD Clip-Filter Sony alpha 7","offer_id":42072410620081,"sku":"8H00DP-7","price":214.0,"currency_code":"GBP","in_stock":true},{"title":"CLS CCD Clip-Filter Nikon XL","offer_id":42072410652849,"sku":"8H00DP-8","price":214.0,"currency_code":"GBP","in_stock":true},{"title":"CLS CCD Clip-Filter Nikon Z XL","offer_id":42072410685617,"sku":"8H00DP-9","price":223.0,"currency_code":"GBP","in_stock":true},{"title":"CLS CCD Clip-Filter Pentax K-1","offer_id":42072410718385,"sku":"8H00DP-10","price":223.0,"currency_code":"GBP","in_stock":true},{"title":"CLS CCD T-Mount (M42 x 0.75)","offer_id":42072410751153,"sku":"8H00DP-11","price":170.0,"currency_code":"GBP","in_stock":true},{"title":"CLS CCD SC Rear Cell (2\" \/ 24 TPI )","offer_id":42072410783921,"sku":"8H00DP-12","price":223.0,"currency_code":"GBP","in_stock":true},{"title":"CLS CCD 31mm","offer_id":42072410816689,"sku":"8H00DP-13","price":116.0,"currency_code":"GBP","in_stock":true},{"title":"CLS CCD 36mm","offer_id":42072410849457,"sku":"8H00DP-14","price":125.0,"currency_code":"GBP","in_stock":true},{"title":"CLS CCD 50mm","offer_id":42072410882225,"sku":"8H00DP-15","price":206.0,"currency_code":"GBP","in_stock":true},{"title":"CLS CCD M49","offer_id":42072410914993,"sku":"8H00DP-16","price":206.0,"currency_code":"GBP","in_stock":true},{"title":"CLS CCD M52","offer_id":42072410947761,"sku":"8H00DP-17","price":214.0,"currency_code":"GBP","in_stock":true},{"title":"CLS CCD M55","offer_id":42072410980529,"sku":"8H00DP-18","price":448.0,"currency_code":"GBP","in_stock":true},{"title":"CLS CCD M58","offer_id":42072411013297,"sku":"8H00DP-19","price":448.0,"currency_code":"GBP","in_stock":true},{"title":"CLS CCD M62","offer_id":42072411046065,"sku":"8H00DP-20","price":466.0,"currency_code":"GBP","in_stock":true},{"title":"CLS CCD M67","offer_id":42072411078833,"sku":"8H00DP-21","price":475.0,"currency_code":"GBP","in_stock":true},{"title":"CLS CCD M72","offer_id":42072411111601,"sku":"8H00DP-22","price":475.0,"currency_code":"GBP","in_stock":true},{"title":"CLS CCD M77","offer_id":42072411144369,"sku":"8H00DP-23","price":475.0,"currency_code":"GBP","in_stock":true},{"title":"CLS CCD 27mm unmounted","offer_id":42072411177137,"sku":"8H00DP-24","price":89.0,"currency_code":"GBP","in_stock":true},{"title":"CLS CCD 42mm unmounted","offer_id":42072411209905,"sku":"8H00DP-25","price":143.0,"currency_code":"GBP","in_stock":true},{"title":"CLS CCD 50 x 50mm2 unmounted","offer_id":42072411242673,"sku":"8H00DP-26","price":214.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0523\/1650\/4241\/files\/astronomik-cls-ccd-filters-181759.jpg?v=1782295254"}],"url":"https:\/\/www.darkclearskies.co.uk\/collections\/featured-astronomik-equipment.oembed","provider":"Dark Clear Skies ","version":"1.0","type":"link"}