{"title":"Featured Antlia Equipment","description":"\u003cp\u003eSelected Antlia filters and imaging accessories at Dark Clear Skies.\u003c\/p\u003e","products":[{"product_id":"alp-t-2-dualband-5nm-ha-oiii-filter-high-contrast-deep-sky-imaging","title":"ALP-T 2\" Dualband 5nm Ha \u0026 OIII Filter - High Contrast Deep-Sky Imaging","description":"\u003cdiv class=\"product-description\"\u003e\n\u003ch1\u003eAntlia ALP-T Dual Band 5nm Ha \u0026amp; OIII Filters\u003c\/h1\u003e\n\u003cp\u003eThe \u003cstrong\u003eAntlia ALP-T Dual Band 5nm Filters\u003c\/strong\u003e are premium dual-line pass filters designed to enhance astrophotography by isolating H-alpha and OIII emission lines. Available in both \u003cstrong\u003eStandard\u003c\/strong\u003e and \u003cstrong\u003eHighspeed\u003c\/strong\u003e versions, these filters provide unmatched performance for a range of optical systems, ensuring vibrant and contrasted nebula imaging even in light-polluted conditions.\u003c\/p\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDual Bandpass:\u003c\/strong\u003e Captures H-alpha (656.3nm) and OIII (500.7nm) lines simultaneously for efficient imaging.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandard Version:\u003c\/strong\u003e Optimized for f-ratios slower than f\/3.6, providing exceptional performance for most optical systems.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHighspeed Version:\u003c\/strong\u003e Tailored for fast optics between f\/2.2 and f\/3.6, with a slightly shifted passband to maximize transmission and contrast.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLight Suppression:\u003c\/strong\u003e Advanced coatings achieve an optical density (OD) of 4.5, minimizing interference from light pollution, moonlight, and airglow.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMinimized Halo Effect:\u003c\/strong\u003e Steep bandpass edges reduce internal reflections, delivering cleaner images around bright stars.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrecision Manufacturing:\u003c\/strong\u003e Each filter is inspected with Agilent Cary spectrophotometers for consistent, reliable results.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003ePerformance\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eStandard Version\u003c\/strong\u003e excels with optics slower than f\/3.6, offering balanced performance across most systems. For optics faster than f\/3.6, the \u003cstrong\u003eHighspeed Version\u003c\/strong\u003e ensures enhanced contrast and nebula visibility. While filters used with optics faster than f\/2 may experience a 15–20% decrease in transmission due to wavelength shifts, they maintain exceptional imaging quality.\u003c\/p\u003e\n\u003ch2\u003eApplications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eDesigned for use with DSLR, CMOS, and CCD colour cameras\u003c\/li\u003e\n\u003cli\u003eCompatible with one-shot colour cameras and monochrome setups\u003c\/li\u003e\n\u003cli\u003eEffective in light-polluted areas and under moonlit skies\u003c\/li\u003e\n\u003cli\u003eIdeal for capturing nebulae, supernova remnants, and other emission objects\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBandpass:\u003c\/strong\u003e 5nm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOptical Density:\u003c\/strong\u003e OD 4.5\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTransmission Efficiency:\u003c\/strong\u003e High transmission for H-alpha and OIII\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCoatings:\u003c\/strong\u003e Multi-coated to suppress unwanted light\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWhy Choose Antlia ALP-T Filters?\u003c\/h2\u003e\n\u003cp\u003eWhether you're using a standard optical system or fast optics, the Antlia ALP-T Dual Band 5nm Filters deliver exceptional results. With their high transmission, superior contrast, and reduced halo effects, these filters offer a perfect balance of performance and value for astrophotographers seeking precision and reliability.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Antlia","offers":[{"title":"ALP-T 2\" Dualband 5nm Ha\u0026OIII filter","offer_id":43509575090353,"sku":"ANT-ALP-T-2-Ha-OIII","price":398.0,"currency_code":"GBP","in_stock":true},{"title":"ALP-T  2\" Dualband 5nm Ha\u0026OIII  Highspeed","offer_id":43509575123121,"sku":"ANT-ALP-T-2-HIGHSPEED","price":398.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0523\/1650\/4241\/files\/alp-t-dualband-5nm-ha-amp-oiii-filter-627198.webp?v=1782294527"},{"product_id":"antlia-h-beta-oiii-1-25-filter-for-visual-astrophotography-use","title":"Antlia H-beta \u0026 OIII 1.25\" Filter","description":"\u003ch1 class=\"title page-title\"\u003eAntlia H-beta \u0026amp; OIII 1.25\" Filter  - 1.25\"\u003c\/h1\u003e\n\n\u003cp\u003eThe Antlia H-beta \u0026amp; OIII 1.25\" Filter  is engineered specifically for night visual nebulae observation at a high contrast and Deep-sky astrophotography. Its transmission is 90% or greater at critical  wavelengths (OIII 500.7nm, OIII 495.9nm, and H-Beta 486.1nm). You’ll notice much higher contrast boost to observe Planetary Nebula, Supernova Remnant, Emission Nebula, Diffuse Nebula, and extremely faint nebulae by Antlia HB-OIII filter.\u003cbr\u003e\nWhen the Antlia H-beta \u0026amp; OIII 1.25\" Filter used for Astro Deep-sky imaging, it enhances the details of the OIII and H-Beta emission lines with astronomical cameras and DSLRs.\u003c\/p\u003e\n\n\u003ch4\u003e\n\u003cb\u003eAntlia H-beta \u0026amp; OIII 1.25\" Filter  \u003c\/b\u003e\u003cstrong\u003eMAIN APPLICATION AND PERFORMANCE:\u003c\/strong\u003e\n\u003c\/h4\u003e\n\n\u003cp\u003eThe Antlia H-beta \u0026amp; OIII 1.25\" Filter was coated with almost total suppression of optical density (OD4) on unwanted wavelength and the filter cut-off wavelength is 300-1000nm, which meets the spectral requirements of photographic cameras and further enhances the suppression of the IR region, compared with the visual filters with a cut-off depth of OD3@350-750nm, it performs better to darken the sky background and make deep-sky observation and photography of nebulae, star clusters, and galaxies more easily.\u003cbr\u003e\nThe HB-OIII filter helps faint objects become much more visible against the blackened background and produces near-photographic views of the Veil, Dumbbell, and Orion nebula, among many other objects under both light-polluted and dark skies.\u003cbr\u003e\nSince human eyes are less sensitive at night, large aperture telescopes are recommended to gather light and funnel it into the observer's eyes.\u003c\/p\u003e\n\n\u003cp\u003e\u003c\/p\u003e\n\n\u003cp\u003eAntlia H-beta \u0026amp; OIII 1.25\" Filter Technical Specifications:\u003c\/p\u003e\n\n\u003ctable border=\"1\" cellpadding=\"1\" cellspacing=\"1\"\u003e\n\t\u003ctbody\u003e\n\t\t\u003ctr\u003e\n\t\t\t\u003ctd\u003e\u003c\/td\u003e\n\t\t\t\u003ctd\u003eOxygen III\u003c\/td\u003e\n\t\t\t\u003ctd\u003eOxygen III\u003c\/td\u003e\n\t\t\t\u003ctd\u003eH-beta\u003c\/td\u003e\n\t\t\u003c\/tr\u003e\n\t\t\u003ctr\u003e\n\t\t\t\u003ctd\u003eCWL (Central Wavelength)\u003c\/td\u003e\n\t\t\t\u003ctd\u003e500.7nm\u003c\/td\u003e\n\t\t\t\u003ctd\u003e495.9nm\u003c\/td\u003e\n\t\t\t\u003ctd\u003e486.1nm\u003c\/td\u003e\n\t\t\u003c\/tr\u003e\n\t\t\u003ctr\u003e\n\t\t\t\u003ctd\u003ePeak transmission\u003c\/td\u003e\n\t\t\t\u003ctd\u003e\u0026gt;90%\u003c\/td\u003e\n\t\t\t\u003ctd\u003e\u0026gt;90%\u003c\/td\u003e\n\t\t\t\u003ctd\u003e\u0026gt;90%\u003c\/td\u003e\n\t\t\u003c\/tr\u003e\n\t\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ctable border=\"1\" cellpadding=\"1\" cellspacing=\"1\"\u003e\n\t\u003ctbody\u003e\n\t\t\u003ctr\u003e\n\t\t\t\u003ctd\u003eBlocking     \u003c\/td\u003e\n\t\t\t\u003ctd\u003eOD4@\u003cspan\u003e \u003c\/span\u003e300-1000nm\u003c\/td\u003e\n\t\t\u003c\/tr\u003e\n\t\t\u003ctr\u003e\n\t\t\t\u003ctd\u003eFilter Thickness\u003c\/td\u003e\n\t\t\t\u003ctd\u003e2mm+\/-0.05mm\u003c\/td\u003e\n\t\t\u003c\/tr\u003e\n\t\t\u003ctr\u003e\n\t\t\t\u003ctd\u003eBasic Substrate\u003c\/td\u003e\n\t\t\t\u003ctd\u003eOptical, Single, Non-glued substrate\u003c\/td\u003e\n\t\t\u003c\/tr\u003e\n\t\t\u003ctr\u003e\n\t\t\t\u003ctd\u003eSurface Quality\u003c\/td\u003e\n\t\t\t\u003ctd\u003eS\/D (scratch\/dig)= 60\/40 (Refer to MIL-O-13830)\u003c\/td\u003e\n\t\t\u003c\/tr\u003e\n\t\t\u003ctr\u003e\n\t\t\t\u003ctd\u003eTransmitted Wave front                                   \u003c\/td\u003e\n\t\t\t\u003ctd\u003eLambda\/4 or better\u003c\/td\u003e\n\t\t\u003c\/tr\u003e\n\t\t\u003ctr\u003e\n\t\t\t\u003ctd\u003eParallelism\u003c\/td\u003e\n\t\t\t\u003ctd\u003eless than 30 arcsec\u003c\/td\u003e\n\t\t\u003c\/tr\u003e\n\t\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003cp\u003e\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eSizes and MAP Prices：\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eSize Minimum Advertised Pricing (MAP)\u003cbr\u003e\nMounted: 1.25’’ US$99.00\u003cbr\u003e\nOther sizes 2’’ Availability and price are to be confirmed\u003c\/p\u003e\n\n\u003ch4\u003e\n\u003cb\u003eAntlia H-beta \u0026amp; OIII 1.25\" Filter \u003c\/b\u003e\u003cstrong\u003eFILTER RING:\u003c\/strong\u003e\n\u003c\/h4\u003e\n\n\u003cp\u003e1.25’’(M28.5*0.6)\u003cbr\u003e\nUltra-thin filter cell to minimize vignetting, Black anodized finish, Laser engraving No fading\u003c\/p\u003e\n\n\u003cp\u003eWarranty: 3-years against delamination\u003c\/p\u003e\n\n\u003cp\u003e\u003cb\u003e\u003cspan style=\"color: #ff0000;\"\u003eDO NOT LOOK AT THE SUN WITH ANTLIA FILTERS. Serious eye damage will result if you fail to observe the warning.\u003c\/span\u003e\u003c\/b\u003e\u003c\/p\u003e\n\n\u003cp\u003e\u003cimg alt=\"\" src=\"https:\/\/www.365astronomy.com\/image\/cache\/wp\/lj\/product\/ANTLIA\/antlia-h-beta-and-oiii-visual-and-astrophotography-filter-1.25-Spectrum-Curve.webp\"\u003e\u003c\/p\u003e\n\n\u003cp\u003e\u003c\/p\u003e\n\n\u003cp\u003e\u003c\/p\u003e","brand":"Antlia","offers":[{"title":"Default Title","offer_id":42278648807601,"sku":"ANT-HB-OIII-1.25","price":104.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0523\/1650\/4241\/files\/antlia-h-beta-and-oiii-visual-and-astrophotography-filter-125-852119.webp?v=1782294572"},{"product_id":"antlia-ir-pass-685nm-1-25","title":"Antlia IR Pass 685nm 1.25\"","description":"\u003ch1 class=\"title page-title\"\u003eAntlia IR Pass 685nm  Planetary Imaging Filter - Mounted in 1.25\" Filter Cell (31.8mm)\u003c\/h1\u003e\n\n\u003cp\u003eThe Antlia IR Pass 685nm filter is an absorption filter that allows infrared light with wavelengths of more than 685nm to pass through. It nicely complements the Antlia 850nm IR-Pass filter. At these longer wavelengths, the sensitivity of the unaided eye is reduced, so it is not suitable for visual observations. The Antlia IR Pass 685nm is highly recommended for any planetary photography. At long-wavelength spectral range the atmospheric air turbulence (seeing) has much lower impact on the sharpness. The closer to the infrared band, planetary images are less disturbed by wave front distortions in the atmosphere (seeing), and this results in the sharpest and highest contrast images possible.\u003c\/p\u003e\n\n\u003cp\u003eBy combining a luminance image taken with the Antlia IR Pass 685nm along with RGB and U-Venus filters, overall image sharpness is significantly enhanced and details of planets in different bands are taken. This filter makes it also possible to image some planets during daylight due to the dark background sky created by the 685nm IR Pass Filter.\u003c\/p\u003e\n\n\u003ch3\u003eAntlia IR Pass 685nm Technical Data:\u003c\/h3\u003e\n\n\u003cul\u003e\n\t\u003cli\u003eSchott optical substrate\u003c\/li\u003e\n\t\u003cli\u003e1.25” mounted (2mm+\/-0.05mm)\u003c\/li\u003e\n\t\u003cli\u003eSurface Quality: 60\/40 (Refer to MIL-O-13830)\u003c\/li\u003e\n\t\u003cli\u003eBoth sides fine-optically polished to ensure accurate 1\/4 wave front\u003c\/li\u003e\n\t\u003cli\u003e30 arcsec parallelism\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eAntlia IR Pass 685nm Filter Cell (specifications for cell mounted filters only):\u003c\/h3\u003e\n\n\u003cul\u003e\n\t\u003cli\u003e1.25” (M28.5*0.6)\u003c\/li\u003e\n\t\u003cli\u003eUltra-thin filter cell to minimize vignetting by maximized possible clear aperture\u003c\/li\u003e\n\t\u003cli\u003eBlack Anodized Finish\u003c\/li\u003e\n\t\u003cli\u003eNon-Fading Laser Engraving\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eAvailable Sizes：\u003c\/h3\u003e\n\n\u003cul\u003e\n\t\u003cli\u003eMounted： 1.25” (2mm thickness)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003e\n\u003cbr\u003e\nNot recommended for:\u003c\/h3\u003e\n\n\u003cul\u003e\n\t\u003cli\u003eSolar Observing and imaging\u003c\/li\u003e\n\t\u003cli\u003eVisual observation\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cspan\u003eIMPORTANT!\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003eDO NOT LOOK AT THE SUN WITH ANTLIA FILTERS.\u003cbr\u003e\nSerious eye damage will result if you fail to observe the warning.\u003c\/p\u003e\n\n\u003ch3\u003eIn the box:\u003c\/h3\u003e\n\n\u003cp\u003e1 pc IR-Pass 685nm filter in a Plastic case\u003c\/p\u003e","brand":"Antlia","offers":[{"title":"Default Title","offer_id":42278679937201,"sku":"ANT-IR685-1.25","price":41.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0523\/1650\/4241\/files\/antlia-ir-pass-685nm-planetary-imaging-filter-125-272456.webp?v=1782294591"},{"product_id":"antlia-lrgb-v-series-pro-filter-2-for-precision-astrophotography","title":"Antlia LRGB V-series PRO Filter 2\" for Precision Astrophotography","description":"\u003ch1\u003eAntlia LRGB V-series PRO Filter 2\" - Mounted in 2\" Filter Cell (50.8mm)\u003c\/h1\u003e\n\n\u003cp\u003eThe Antlia LRGB V-series PRO Filter 2\"are designed for monochrome cameras that use both CCD and CMOS sensors. Suitable sensors include KAF\/KAI, Sony, GSENSE and other sensor manufacturers. This filter set is designed to approximately equalize the RGB response from monochrome sensors . The result is that you achieve 1:1:1 equalized RGB exposures with the benefit of simplified post processing and reduced dark frame library.\u003cbr\u003e\nThe Antlia LRGB V-series PRO Filter 2\" highlight both the spectral gap design between green and red filters to minimize effect of light pollution and high transmittance of useful emission lines which means it remains effective for weaker emission lines from galaxies and nebulae. The V-series filters guarantee the high transmission of the OIII band in both the B and G filters (OIII signal \u0026gt;95% in blue and green).\u003cbr\u003e\nThe bandwidth of the B channel is narrowed for the purpose of effectively improving the blue overflow around the star due to B channel overexposure when RGB is synthesized.\u003cbr\u003e\nThe Antlia V-series filters block the emission line around 589nm, which suppresses much of the light pollution from high pressure sodium and mercury street lamps and results in a more natural colour balance. The uniformity in substrate thickness delivers good parfocal performance across all of its narrowband filters.\u003c\/p\u003e\n\n\u003ch3\u003eAntlia LRGB V-series PRO Filter 2\" Application and Performance:\u003c\/h3\u003e\n\n\u003cul\u003e\n\t\u003cli\u003eAntlia LRGB V-series PRO Filter 2\"Designed for monochrome CCD and CMOS cameras;\u003c\/li\u003e\n\t\u003cli\u003eGreat imaging colours for celestial objects, galaxies, star clusters and nebulae;\u003c\/li\u003e\n\t\u003cli\u003eTransmittance rate＞95%, high optical throughput;\u003c\/li\u003e\n\t\u003cli\u003e2 sides AR coating, significant reflection and star halo reduction;\u003c\/li\u003e\n\t\u003cli\u003eRGB colour combine 1:1:1, resulting in well balanced RGB and LRGB images;\u003c\/li\u003e\n\t\u003cli\u003eEqual RGB exposures means one master dark frame;\u003c\/li\u003e\n\t\u003cli\u003eParfocal across all filters in this set;\u003c\/li\u003e\n\t\u003cli\u003eAntlia LRGB V-series PRO Filter 2\" has Improved colour separation with suppression of mercury and sodium lines.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003ca href=\"https:\/\/www.365astronomy.com\/image\/cache\/wp\/ij\/content\/LRGB-V_Spectrum_Curve.webp\"\u003e\u003cimg alt=\"\" src=\"https:\/\/www.365astronomy.com\/image\/cache\/wp\/ij\/content\/LRGB-V_Spectrum_Curve.webp\"\u003e\u003c\/a\u003e\u003c\/p\u003e\n\n\u003ch3\u003eAntlia LRGB V-series PRO Filter 2\" Technical Data:\u003c\/h3\u003e\n\n\u003cul\u003e\n\t\u003cli\u003eSchott optical substrate\u003c\/li\u003e\n\t\u003cli\u003e1.25”, 2” mounted, 31mm,36mm diameter (2mm+\/-0.05mm)\u003c\/li\u003e\n\t\u003cli\u003e50mm dia，50*50mm，65*65mm square (3mm+\/-0.05mm)\u003c\/li\u003e\n\t\u003cli\u003eSurface Quality: 60\/40 (Refer to MIL-O-13830)\u003c\/li\u003e\n\t\u003cli\u003eBoth sides fine-optically polished to ensure accurate 1\/4 wave front\u003c\/li\u003e\n\t\u003cli\u003e30 arcsec parallelism\u003c\/li\u003e\n\t\u003cli\u003eTave＞95%\u003c\/li\u003e\n\t\u003cli\u003eOD3（0.1%）@ 300-1050nm\u003c\/li\u003e\n\t\u003cli\u003eMulti-layer anti-reflection coating\u003c\/li\u003e\n\t\u003cli\u003eSingle Non-glued substrate\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eAntlia LRGB V-series PRO Filter 2\" Filter Cell (specifications for cell mounted filters only):\u003c\/h3\u003e\n\n\u003cul\u003e\n\t\u003cli\u003e1.25” (M28.5*0.6)，2” (M48*0.75)\u003c\/li\u003e\n\t\u003cli\u003eUltra-thin filter cell to minimize vignetting by maximized possible clear aperture\u003c\/li\u003e\n\t\u003cli\u003eBlack Anodized Finish\u003c\/li\u003e\n\t\u003cli\u003eNon-Fading Laser Engraving\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSizes：\u003c\/h3\u003e\n\n\u003cul\u003e\n\t\u003cli\u003eMounted： 1.25” \u0026amp; 2” (2mm thickness)\u003c\/li\u003e\n\t\u003cli\u003eUnmounted：Dia 31mm，Dia 36mm (2mm thickness)\u003c\/li\u003e\n\t\u003cli\u003eUnmounted：Dia 50mm (3mm thickness)\u003c\/li\u003e\n\t\u003cli\u003eUnmounted：50*50*3mm，65*65*3mm square (3mm thickness)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003e\n\u003cbr\u003e\nNot recommended:\u003c\/h3\u003e\n\n\u003cul\u003e\n\t\u003cli\u003eSolar Observing and imaging\u003c\/li\u003e\n\t\u003cli\u003eVisual observation\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cspan\u003eIMPORTANT!\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003eDO NOT LOOK AT THE SUN WITH ANTLIA FILTERS.\u003cbr\u003e\nSerious eye damage will result if you fail to observe the warning.\u003c\/p\u003e\n\n\u003ch3\u003eAntlia LRGB V-series PRO Filter 2\" : In the box:\u003c\/h3\u003e\n\n\u003cp\u003eSet includes Luminance ( IR\/UV blocked colourless), Red, Green and Blue filters\u003c\/p\u003e","brand":"Antlia","offers":[{"title":"Default Title","offer_id":42278705922225,"sku":"ANT-LRGB-V-2-PRO","price":459.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0523\/1650\/4241\/files\/antlia-lrgb-v-series-pro-astronomy-imaging-filters-2-580197.webp?v=1782294596"},{"product_id":"antlia-4-5nm-h-alpha-edge-filter-1-25","title":"Antlia 4.5nm Edge Filters","description":"\u003ch2\u003eAntlia 4.5nm EDGE Filters (H-alpha, SII, OIII)\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eOverview\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eAntlia 4.5nm EDGE Filters are engineered to overcome the challenges of conventional narrowband filters, which often experience significant transmission loss due to Central Wavelength (CWL) shifts. With a guaranteed transmission rate of over 90% (T\u0026gt;90%) within a 1nm range of the central bandwidth, Antlia 4.5nm EDGE Filters deliver outstanding performance for both long focal ratios and fast optical systems. Blue-shift analysis confirms their suitability for systems as fast as f\/3, minimising signal loss and optimising imaging quality.\u003c\/p\u003e\n\n\u003chr\u003e\n\n\u003ch3\u003eApplications and Performance\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eAntlia 4.5nm EDGE Filters provide high transmittance and narrow bandwidth to maximise contrast in astrophotography.\u003c\/li\u003e\n  \u003cli\u003eThese filters feature a steep spectral profile to minimise halos around bright stars, ensuring clean and precise images.\u003c\/li\u003e\n  \u003cli\u003eConstructed with a single optical-grade substrate, Antlia 4.5nm EDGE Filters eliminate internal reflections for enhanced reliability.\u003c\/li\u003e\n  \u003cli\u003eDesigned for imaging deep-sky objects emitting H-alpha, SII, and OIII wavelengths, such as emission nebulae, planetary nebulae, and supernova remnants.\u003c\/li\u003e\n  \u003cli\u003eAntlia 4.5nm EDGE Filters excel in both light-polluted and dark-sky environments.\u003c\/li\u003e\n  \u003cli\u003eExtend imaging opportunities with Antlia 4.5nm EDGE Filters, even under moonlit skies.\u003c\/li\u003e\n  \u003cli\u003eOptimised for optical systems as fast as f\/3, these filters minimise signal loss while maintaining superior image quality.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eNote:\u003c\/strong\u003e These filters are designed specifically for astrophotography and are effective for capturing H-alpha, SII, or OIII emissions.\u003c\/p\u003e\n\n\u003chr\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSubstrate:\u003c\/strong\u003e Optical-grade, single\/non-glued substrate.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFilter Thickness:\u003c\/strong\u003e \n    \u003cul\u003e\n      \u003cli\u003e2mm ± 0.05mm for 1.25”, 2” mounted, Dia31mm, and Dia36mm unmounted filters.\u003c\/li\u003e\n      \u003cli\u003e3mm ± 0.05mm for Dia50mm unmounted filters.\u003c\/li\u003e\n    \u003c\/ul\u003e\n  \u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFWHM (Full Width at Half Maximum):\u003c\/strong\u003e 4.5nm.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCWL (Central Wavelength):\u003c\/strong\u003e \n    \u003cul\u003e\n      \u003cli\u003eH-alpha: 656.3nm.\u003c\/li\u003e\n      \u003cli\u003eSII: 672.4nm.\u003c\/li\u003e\n      \u003cli\u003eOIII: 500.7nm.\u003c\/li\u003e\n    \u003c\/ul\u003e\n  \u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePeak Transmission:\u003c\/strong\u003e \u0026gt;90%.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBlocking:\u003c\/strong\u003e \u0026gt; 5 OD (out-of-band blocking) @ 300–1000nm.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSurface Quality:\u003c\/strong\u003e S\/D (scratch\/dig) = 60\/40 (per MIL-O-13830 standards).\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTransmitted Wavefront:\u003c\/strong\u003e Lambda\/4 or better.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eParallelism:\u003c\/strong\u003e Less than 30 arcsec.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003chr\u003e\n\n\u003ch3\u003eFilter Cell\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSizes:\u003c\/strong\u003e \n    \u003cul\u003e\n      \u003cli\u003eMounted: 1.25” (M28.5x0.6), 2” (M48x0.75).\u003c\/li\u003e\n      \u003cli\u003eUnmounted: Dia31mm, Dia36mm, Dia50mm.\u003c\/li\u003e\n    \u003c\/ul\u003e\n  \u003c\/li\u003e\n  \u003cli\u003eUltra-thin filter cell to minimise vignetting.\u003c\/li\u003e\n  \u003cli\u003eBlack anodised finish with non-fading laser engraving.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003chr\u003e\n\n\u003ch3\u003eImportant Notes\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eNot recommended for solar observing or visual observation.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 3 years against delamination.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWarning:\u003c\/strong\u003e Do not look at the Sun with Antlia 4.5nm EDGE Filters. Serious eye damage will result.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003chr\u003e\n\n\u003ch3\u003eManufacturer's Note\u003c\/h3\u003e\n\u003cp\u003eAntlia 4.5nm EDGE Filters are meticulously designed to deliver high-performance astrophotography results. Each filter undergoes rigorous quality control to ensure high transmittance, precise band-pass parameters, and exceptional optical reliability. While halos around bright stars are rare due to advanced engineering, minor halos may occur with certain optical setups. Higher-end filters, such as Astrodon or Chroma, can guarantee halo-free images, but Antlia 4.5nm EDGE Filters provide an exceptional price-to-performance ratio, making them an excellent choice for most users.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eReturn Policy:\u003c\/strong\u003e Returns are not accepted for halo-related issues.\u003c\/p\u003e","brand":"Antlia","offers":[{"title":"Ha 1.25\"","offer_id":54823300661624,"sku":"ANT-4.5HA-1.25EDGE-1","price":194.0,"currency_code":"GBP","in_stock":true},{"title":"Ha 31mm","offer_id":54823300694392,"sku":"ANT-4.5HA-1.25EDGE-2","price":205.0,"currency_code":"GBP","in_stock":true},{"title":"Ha 36mm","offer_id":54823300727160,"sku":"ANT-4.5HA-1.25EDGE-3","price":236.0,"currency_code":"GBP","in_stock":true},{"title":"Ha 2\"","offer_id":54823300759928,"sku":"ANT-4.5HA-1.25EDGE-4","price":304.0,"currency_code":"GBP","in_stock":true},{"title":"Ha 50mm","offer_id":54823300792696,"sku":"ANT-4.5HA-1.25EDGE-5","price":367.0,"currency_code":"GBP","in_stock":true},{"title":"SII 1.25\"","offer_id":54823300825464,"sku":"ANT-4.5HA-1.25EDGE-6","price":194.0,"currency_code":"GBP","in_stock":true},{"title":"SII 31mm","offer_id":54823300858232,"sku":"ANT-4.5HA-1.25EDGE-7","price":205.0,"currency_code":"GBP","in_stock":true},{"title":"SII 36mm","offer_id":54823300891000,"sku":"ANT-4.5HA-1.25EDGE-8","price":236.0,"currency_code":"GBP","in_stock":true},{"title":"SII 2\"","offer_id":54823300923768,"sku":"ANT-4.5HA-1.25EDGE-9","price":304.0,"currency_code":"GBP","in_stock":true},{"title":"SII 50mm","offer_id":54823300956536,"sku":"ANT-4.5HA-1.25EDGE-10","price":367.0,"currency_code":"GBP","in_stock":true},{"title":"OIII 1.25\"","offer_id":54823300989304,"sku":"ANT-4.5HA-1.25EDGE-11","price":194.0,"currency_code":"GBP","in_stock":true},{"title":"OIII 31mm","offer_id":54823301022072,"sku":"ANT-4.5HA-1.25EDGE-12","price":205.0,"currency_code":"GBP","in_stock":true},{"title":"OIII 36mm","offer_id":54823301054840,"sku":"ANT-4.5HA-1.25EDGE-13","price":236.0,"currency_code":"GBP","in_stock":true},{"title":"OIII 2\"","offer_id":54823301087608,"sku":"ANT-4.5HA-1.25EDGE-14","price":304.0,"currency_code":"GBP","in_stock":true},{"title":"OIII 50mm","offer_id":54823301120376,"sku":"ANT-4.5HA-1.25EDGE-15","price":367.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0523\/1650\/4241\/files\/antlia-narrowband-45nm-h-alpha-edge-filter-2-409012_4ad49956-e92a-4432-a0ec-ee697f4c8ef3.webp?v=1782294615"},{"product_id":"antlia-3-0nm-pro-filters","title":"Antlia 3.0nm Pro Filters","description":"\u003ch2\u003eAntlia 3.0nm Pro Filters (H-alpha, SII, OIII)\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eOverview\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eAntlia 3.0nm Pro Filters are a premium solution for astrophotography, designed to achieve ultra-high contrast by isolating narrowband emissions. With a guaranteed transmission rate of over 90% (T\u0026gt;90%) within a precise 3.0nm bandwidth, Antlia 3.0nm Pro Filters excel in suppressing light pollution and achieving maximum contrast for both faint and bright targets. Engineered for systems as fast as f\/3, Antlia 3.0nm Pro Filters ensure minimal signal loss, making them ideal for high-performance optical setups.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003eApplications and Performance\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eAntlia 3.0nm Pro Filters offer exceptional transmittance and a narrow band-pass to enhance contrast in astrophotography.\u003c\/li\u003e\n\u003cli\u003eThe ultra-steep spectral profile of Antlia 3.0nm Pro Filters minimises halos, ensuring clean and detailed imaging around bright stars.\u003c\/li\u003e\n\u003cli\u003eManufactured with optical-grade single substrates, Antlia 3.0nm Pro Filters eliminate internal reflections for optimal reliability.\u003c\/li\u003e\n\u003cli\u003ePerfect for capturing H-alpha, SII, and OIII emissions in deep-sky objects, including emission nebulae, planetary nebulae, and supernova remnants.\u003c\/li\u003e\n\u003cli\u003eAntlia 3.0nm Pro Filters are effective in both light-polluted skies and dark-sky locations, ensuring flexibility in imaging conditions.\u003c\/li\u003e\n\u003cli\u003eDesigned to extend imaging time, Antlia 3.0nm Pro Filters allow for successful imaging even under moonlit skies.\u003c\/li\u003e\n\u003cli\u003eOptimised for systems with focal ratios as fast as f\/3, these filters minimise emission signal loss while maximising imaging potential.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eNote:\u003c\/strong\u003e Antlia 3.0nm Pro Filters are specifically tailored for astrophotography and are ideal for capturing H-alpha, SII, or OIII wavelengths.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSubstrate:\u003c\/strong\u003e Optical-grade, single\/non-glued substrate.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFilter Thickness:\u003c\/strong\u003e\n\u003cul\u003e\n\u003cli\u003e2mm ± 0.05mm for 1.25”, 2” mounted, Dia31mm, and Dia36mm unmounted filters.\u003c\/li\u003e\n\u003cli\u003e3mm ± 0.05mm for Dia50mm unmounted filters.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFWHM (Full Width at Half Maximum):\u003c\/strong\u003e 3.0nm.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCWL (Central Wavelength):\u003c\/strong\u003e\n\u003cul\u003e\n\u003cli\u003eH-alpha: 656.3nm.\u003c\/li\u003e\n\u003cli\u003eSII: 672.4nm.\u003c\/li\u003e\n\u003cli\u003eOIII: 500.7nm.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePeak Transmission:\u003c\/strong\u003e \u0026gt;90%.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBlocking:\u003c\/strong\u003e \u0026gt; 5 OD (out-of-band blocking) @ 300–1000nm.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSurface Quality:\u003c\/strong\u003e S\/D (scratch\/dig) = 60\/40 (per MIL-O-13830 standards).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTransmitted Wavefront:\u003c\/strong\u003e Lambda\/4 or better.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eParallelism:\u003c\/strong\u003e Less than 30 arcsec.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003eFilter Cell\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSizes:\u003c\/strong\u003e\n\u003cul\u003e\n\u003cli\u003eMounted: 1.25” (M28.5x0.6), 2” (M48x0.75).\u003c\/li\u003e\n\u003cli\u003eUnmounted: Dia31mm, Dia36mm, Dia50mm.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003eUltra-thin filter cell to minimise vignetting.\u003c\/li\u003e\n\u003cli\u003eBlack anodised finish with non-fading laser engraving.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003eImportant Notes\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eNot recommended for solar observing or visual observation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 3 years against delamination.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarning:\u003c\/strong\u003e Do not look at the Sun with Antlia 3.0nm Pro Filters. Serious eye damage will result.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003eManufacturer's Note\u003c\/h3\u003e\n\u003cp\u003eAntlia 3.0nm Pro Filters are designed with advanced optical precision to meet the demands of professional astrophotographers. Each filter undergoes rigorous quality testing to ensure high transmittance, precise band-pass parameters, and exceptional optical reliability. While minor halos around bright stars are rare, they may occur depending on the optical setup. Although premium filters like Astrodon or Chroma can guarantee halo-free imaging, Antlia 3.0nm Pro Filters strike a balance between performance and affordability, offering outstanding value for most users.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eReturn Policy:\u003c\/strong\u003e Returns are not accepted for halo-related issues.\u003c\/p\u003e","brand":"Antlia","offers":[{"title":"Ha 1.25\"","offer_id":54823320486264,"sku":"ANT-3.0HA-1.25PRO","price":267.0,"currency_code":"GBP","in_stock":true},{"title":"Ha 31mm","offer_id":54823320519032,"sku":"ANT-3.0HA-31PRO","price":288.0,"currency_code":"GBP","in_stock":true},{"title":"Ha 36mm","offer_id":54823320551800,"sku":"ANT-3.0HA-36PRO","price":325.0,"currency_code":"GBP","in_stock":true},{"title":"Ha 2\"","offer_id":54823320584568,"sku":"ANT-3.0HA-2PRO","price":420.0,"currency_code":"GBP","in_stock":true},{"title":"Ha 50mm","offer_id":54823320617336,"sku":"ANT-3.0HA-50PRO","price":513.0,"currency_code":"GBP","in_stock":true},{"title":"SII 1.25\"","offer_id":54823320650104,"sku":"ANT-3.0SII-1.25PRO","price":267.0,"currency_code":"GBP","in_stock":true},{"title":"SII 31mm","offer_id":54823320682872,"sku":"ANT-3.0SII-31PRO","price":288.0,"currency_code":"GBP","in_stock":true},{"title":"SII 36mm","offer_id":54823320715640,"sku":"ANT-3.0SII-36PRO","price":325.0,"currency_code":"GBP","in_stock":true},{"title":"SII 2\"","offer_id":54823320748408,"sku":"ANT-3.0SII-2PRO","price":420.0,"currency_code":"GBP","in_stock":true},{"title":"SII 50mm","offer_id":54823320781176,"sku":"ANT-3.0SII-50PRO","price":513.0,"currency_code":"GBP","in_stock":true},{"title":"OIII 1.25\"","offer_id":54823320813944,"sku":"ANT-3.0OIII-1.25PRO","price":267.0,"currency_code":"GBP","in_stock":true},{"title":"OIII 31mm","offer_id":54823320846712,"sku":"ANT-3.0-OIII-31PRO","price":288.0,"currency_code":"GBP","in_stock":true},{"title":"OIII 36mm","offer_id":54823320879480,"sku":"ANT-3.0-OIII-36PRO","price":325.0,"currency_code":"GBP","in_stock":true},{"title":"OIII 2\"","offer_id":54823320912248,"sku":"ANT-3.0-OIII-2PRO","price":420.0,"currency_code":"GBP","in_stock":true},{"title":"OIII 50mm","offer_id":54823320945016,"sku":"ANT-3.0-OIII-50PRO","price":513.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0523\/1650\/4241\/files\/antlia-ultra-narrowband-3.5nm-filter-1.25-550x550w.webp?v=1782294744"},{"product_id":"antlia-oag-and-filter-drawer","title":"Antlia OAG and Filter Drawer","description":"\u003ch1\u003eAntlia OAG and Filter Drawer Assembly\u003c\/h1\u003e\n\u003cp\u003eThe Antlia OAG and Filter Drawer Assembly is an innovative accessory that integrates a filter drawer with an off-axis guider (OAG). It enables you to utilize your primary imaging camera and telescope for auto-guiding without the need for a heavy, additional guide scope. The OAG employs a small internal pick-off prism to reflect part of the incoming light from the telescope to an independent guide camera. Sharing the same optical path as the main imaging camera, the system effectively handles bending and tilting issues in your setup, ensuring superior tracking accuracy compared to a separate guide scope.\u003c\/p\u003e\n\u003ch2\u003eFeatures\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eLarge pick-off prism (12x12mm) for compatibility with larger guiding sensors, offering a greater selection of guide stars.\u003c\/li\u003e\n\u003cli\u003eMono-block design with the OAG body directly connected to the filter drawer for added rigidity.\u003c\/li\u003e\n\u003cli\u003eSupports APS-C and Full Frame sensors.\u003c\/li\u003e\n\u003cli\u003eTotal thickness (including both side adapters): 37.5mm.\u003c\/li\u003e\n\u003cli\u003eOptimized for cameras with a 17.5mm back focus distance without requiring additional adapters.\u003c\/li\u003e\n\u003cli\u003eCNC-machined aluminium body provides a robust guiding platform.\u003c\/li\u003e\n\u003cli\u003eHigh-quality 1.25-inch helical focuser with 10mm travel range for precise guide star focus.\u003c\/li\u003e\n\u003cli\u003eAdjustable prism height to optimize field illumination for your auto guider based on sensor size.\u003c\/li\u003e\n\u003cli\u003eDovetail-threaded adapters secured with grub screws for 360° rotation and alignment with telescope and camera.\u003c\/li\u003e\n\u003cli\u003e360° rotatable OAG for locating guide stars with ease.\u003c\/li\u003e\n\u003cli\u003eIncludes a variety of adapters for versatile configurations: M42, M48, M54, and M68 male and female (no M42 female).\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eApplications\u003c\/h2\u003e\n\u003cp\u003eThe Antlia OAG and Filter Drawer Assembly is compatible with multiple instruments and brands. Its application is not limited to any specific setup, making it a versatile choice for astrophotographers.\u003c\/p\u003e\n\u003ch2\u003eOptional Accessories\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eFilter sliders: Dia50mm and 50x50mm.\u003c\/li\u003e\n\u003cli\u003eAdapter rings: B-48125, B-4836, B-4831, and other configurations available separately.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eSchematic Diagram 01\u003c\/h3\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/www.365astronomy.com\/image\/cache\/wp\/lp\/product\/ANTLIA\/antlia-oag-and-filter-drawer-assembly-schematic-1.webp\" alt=\"\"\u003e\u003c\/p\u003e\n\u003ch3\u003eSchematic Diagram 02\u003c\/h3\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/www.365astronomy.com\/image\/cache\/wp\/lj\/product\/ANTLIA\/antlia-oag-and-filter-drawer-assembly-1.webp\" alt=\"\"\u003e\u003c\/p\u003e\n\u003ch3\u003eConnecting Diagram\u003c\/h3\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/www.365astronomy.com\/image\/cache\/wp\/lj\/product\/ANTLIA\/antlia-oag-and-filter-drawer-assembly-6.webp\" alt=\"\"\u003e\u003c\/p\u003e\n\u003ch3\u003eThe Standard Antlia OAG and Filter Drawer Attached to Imaging Setup\u003c\/h3\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/www.365astronomy.com\/image\/cache\/wp\/lj\/product\/ANTLIA\/antlia-oag-and-filter-drawer-assembly-5.webp\" alt=\"\"\u003e\u003c\/p\u003e\n\u003cp\u003eThe OAG requires a telescope, imaging camera, autoguider, and a mount tracking equatorially with autoguiding capability. Please refer to Schematic diagram 02 to familiarize with the Antlia OAG.\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/www.365astronomy.com\/image\/cache\/wp\/lj\/product\/ANTLIA\/antlia-oag-and-filter-drawer-assembly-4.webp\" alt=\"\"\u003e\u003c\/p\u003e\n\u003cp\u003eYou need to ensure that the distance from the prism to the main camera sensor is exactly equal to the distance from the prism to the guider sensor.\u003c\/p\u003e\n\u003ch3\u003eList of Parts included in the Antlia OAG\u0026amp; Filter Drawer set:\u003c\/h3\u003e\n\u003cp\u003e1 x Off-Axis Guider Body, 1 x Helical Focuser, 1 x 2-inch (M48*0.75) Filter Slider, 1 x M42-Male Adapter, 1 x M48-Male Adapter, 1 x M48-Female Adapter,1 x M54-Female Adapter, 1 x M54-Male Adapter, 1 x M68-Female Adapter, 1 x M68-Male Adapter, 1 x M42-6mm*1 for 12.5mm BFD, 1 x M42-1.25-27mm\u003c\/p\u003e\n\u003cp\u003eIf you want to replace the 2-inch (M48*0.75) Filter Slider with a Dia50mm or 50x50mm, please contact us before ordering.\u003c\/p\u003e","brand":"Antlia","offers":[{"title":"Default Title","offer_id":54837044019576,"sku":"ANT-OAG-FILTER-DRAWER","price":272.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0523\/1650\/4241\/files\/antlia-oag-and-filter-drawer-assembly-0-1000x1000h.webp?v=1782294700"},{"product_id":"antlia-solar-discover-cak-calcium-k-5a-imaging-solar-filter-assembly","title":"Antlia Solar Discover CaK Calcium-K 5A Imaging Solar Filter Assembly","description":"\u003ch1\u003eAntlia Solar Discover CaK Calcium-K 5A Imaging Solar Filter Assembly\u003c\/h1\u003e\n\u003cp\u003eThe Antlia Solar Discover 5Å CaK assembly incorporates a set of light-reducing filters to reduce solar heat ingress for safe operation during solar imaging. It is specifically engineered to enhance imaging contrast for Plages, Light Bridges, features prominent in the CaK 393.3nm line and sunspots.\u003c\/p\u003e\n\u003cp\u003eThe Antlia 5Å Ultra Narrow Bandpass Filter is built in, it features a clear aperture of D12mm (B1200) and a wavelength centered on the Calcium II K-Line at 393.3nm. With its ultra-narrow full width at half maximum (FWHM) of 0.5nm, it enables the capture of details in the Chromosphere.\u003c\/p\u003e\n\u003cp\u003eInstallation is similar to the Antlia CaK 3nm Solar Herschel Wedge, with the telescope attached at one end and the camera at the another. The metal tube machined from aircraft aluminum CNN and oxidized. The filters are assembled within a fully enclosed tube, preventing stray light into it.\u003c\/p\u003e\n\u003ch2\u003eImportant Notes\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eIf you do not use the Barlow lens, your telescope must has a focal ratio ＞7.\u003c\/li\u003e\n\u003cli\u003eOptional 2X,3X and 5X Barlow lenses are available, Antlia specifically designed for Solar Discover 5Å CaK ; please order them separately if required. Please refer to the installation diagram and an installation video can be supplied for your reference.\u003c\/li\u003e\n\u003cli\u003eOptional 50mm and 70mm extension tube are provided by Antlia for better focus. please order them separately if required.\u003c\/li\u003e\n\u003cli\u003eWhen you are using a zenith mirror, or Barlow lens supplied by other manufacturer, the ERF filter must be installed in the correct position for safe operation. Please refer to the installation diagram.\u003c\/li\u003e\n\u003cli\u003eWhen you are using a telescope with an aperture ＞100mm, you need to use additional light reduction solutions, such as ERF filters，solar safety films, lowering the telescope aperture for safe operation while using Solar Discover 5Å CaK; If without the extra light reduction solution, the Solar Discover 5Å CaK can only used with REFRACTORS up to 100mm aperture.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eProduct Installation Diagram\u003c\/h2\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/www.365astronomy.com\/image\/cache\/wp\/lj\/product\/ANTLIA\/CaK\/SolarDiscover5ACaK-antlia-solar-discover-cak-calcium-k-5%C3%A5-imaging-solar-filter-assembly-diagram.webp\"\u003e\u003cimg alt=\"\" src=\"https:\/\/www.365astronomy.com\/image\/cache\/wp\/lj\/product\/ANTLIA\/CaK\/SolarDiscover5ACaK-antlia-solar-discover-cak-calcium-k-5%C3%A5-imaging-solar-filter-assembly-diagram.webp\"\u003e\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch2\u003eAbout Visual Observation\u003c\/h2\u003e\n\u003cp\u003eThe bandpass of CaK (393.3 nm) is almost invisible to the human eyes, hence, the Antlia Solar Discover 5Å CaK assembly is primarily used for solar imaging and not recommended for visual observation due to the difficulty of many to visually see information that CaK has to offer.\u003c\/p\u003e\n\u003cp\u003eIn addition, the IR coating range of our products is slightly different from the ISO 12312-2 Standard for Solar Viewers, please see the following chart and refer to ISO 12312-2 Standard for Solar Viewers (https:\/\/eclipse.aas.org\/eye-safety\/iso12312-2)\u003c\/p\u003e\n\u003cp\u003eFor tough technical requirements and safety considerations, we do not recommend Solar Discover 5Å CaK assembly for visual observation.If you need to use the product for visual observation, it is important to ensure that all filters built into the assembly are in good condition for safety.\u003c\/p\u003e\n\u003cp\u003ePlease contact Antlia if you have any questions.\u003c\/p\u003e\n\u003ctable border=\"0\" cellspacing=\"0\" width=\"676\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd colspan=\"3\" valign=\"center\" width=\"372\"\u003e\n\u003cp\u003e\u003cstrong\u003eISO12312-2 Transmittance Requirements\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd valign=\"center\" width=\"303\"\u003e\n\u003cp\u003e\u003cstrong\u003eAntlia Transmittance Requirements\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e(Solar Discover 5Å CaK， Solar Discover 3nm CaK Assembly，Dualband Ha, CaK and CaH filter Assembly，ERF)\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd valign=\"center\" width=\"116\"\u003e\n\u003cp\u003e\u003cstrong\u003eRequirements\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd valign=\"center\" width=\"116\"\u003e\n\u003cp\u003e\u003cstrong\u003eValue\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd valign=\"center\" width=\"141\"\u003e\n\u003cp\u003e\u003cstrong\u003eWavelength Range\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd valign=\"center\" width=\"303\"\u003e\n\u003cp\u003e\u003cstrong\u003eWavelength Range\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd valign=\"center\" width=\"116\"\u003e\n\u003cp\u003eTmax%\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd valign=\"center\" width=\"116\"\u003e\n\u003cp\u003e0.0032%\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd rowspan=\"2\" valign=\"center\" width=\"141\"\u003e\n\u003cp\u003e380-780nm\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd rowspan=\"2\" valign=\"center\" width=\"303\"\u003e\n\u003cp\u003e380-780nm\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd valign=\"center\" width=\"116\"\u003e\n\u003cp\u003eTmin%\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd valign=\"center\" width=\"116\"\u003e\n\u003cp\u003e0.000061%\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd valign=\"center\" width=\"116\"\u003e\n\u003cp\u003eTmax%（UVB）\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd valign=\"center\" width=\"116\"\u003e\n\u003cp\u003e0.0032%\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd valign=\"center\" width=\"141\"\u003e\n\u003cp\u003e280-315nm\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd valign=\"center\" width=\"303\"\u003e\n\u003cp\u003e280-315nm\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd valign=\"center\" width=\"116\"\u003e\n\u003cp\u003eTmax%（UVA）\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd valign=\"center\" width=\"116\"\u003e\n\u003cp\u003e0.0032%\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd valign=\"center\" width=\"141\"\u003e\n\u003cp\u003e315-380nm\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd valign=\"center\" width=\"303\"\u003e\n\u003cp\u003e315-380nm\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd valign=\"center\" width=\"116\"\u003e\n\u003cp\u003eTmax%（IR）\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd valign=\"center\" width=\"116\"\u003e\n\u003cp\u003e3%\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd valign=\"center\" width=\"141\"\u003e\n\u003cp\u003e780-2000nm\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd valign=\"center\" width=\"303\"\u003e\n\u003cp\u003e780-1700nm\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWarranty: 3-years\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eDisassembly of the assembly is prohibited and voids warranty. Any repair\/returns\/exchange for this item is not accepted once it has been disassembled.\u003c\/p\u003e\n\u003ch2\u003eProduct Structure Diagram\u003c\/h2\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ctable cellpadding=\"0\" cellspacing=\"0\" id=\"picParametersTable\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003ch2\u003eImaging Sample Photo:\u003c\/h2\u003e\n\u003cp\u003e\u003cimg alt=\"5Å sample photo.jpg\" height=\"1289\" src=\"https:\/\/20564242.s21i.faiusr.com\/2\/2\/ABUIABACGAAg89PqrwYowIGy_wcw8Qs4iQo.jpg\" width=\"1521\"\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e","brand":"Antlia","offers":[{"title":"No Barlow","offer_id":54920616771960,"sku":"SolarDiscover5ACaK","price":921.0,"currency_code":"GBP","in_stock":true},{"title":"with x2 Barlow Lens","offer_id":54920614740344,"sku":"SolarDiscover5ACaK-2xBarlow","price":974.0,"currency_code":"GBP","in_stock":true},{"title":"With x3 Barlow Lens","offer_id":54920614707576,"sku":"SolarDiscover5ACaK-3xBarlow","price":974.0,"currency_code":"GBP","in_stock":true},{"title":"With x5 Barlow Lens","offer_id":54920614674808,"sku":"SolarDiscover5ACaK-5xBarlow","price":984.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0523\/1650\/4241\/files\/SolarDiscover5ACaK-antlia-solar-discover-cak-calcium-k-5a-imaging-solar-filter-assembly-2-1000x1000w.webp?v=1738600075"}],"url":"https:\/\/www.darkclearskies.co.uk\/collections\/featured-antlia-equipment.oembed","provider":"Dark Clear Skies ","version":"1.0","type":"link"}