{"title":"Antlia Narrowband Filters","description":"\u003cp\u003eExplore Antlia narrowband filters at Dark Clear Skies.\u003c\/p\u003e","products":[{"product_id":"antlia-pro-ultra-narrowband-3-0nm-h-alpha-filter-50mm-unmounted","title":"Antlia PRO Ultra Narrowband 3.0nm H-alpha Filter - 50mm Unmounted","description":"\u003ch1 class=\"title page-title\"\u003eAntlia PRO H-Alpha (Ha) 3.0nm Ultra-Narrowband Filter - 50mm Round Unmounted (glass only)\u003c\/h1\u003e\n\n\u003cp\u003e\u003cspan\u003eAntlia H-alpha Pro narrowband filter optimizes the FWHM (full width half maximum) to 3nm\u003c\/span\u003e\u003cspan\u003e bandpass\u003c\/span\u003e\u003cspan\u003e. \u003c\/span\u003e\u003cspan\u003eAs the bandwidth becomes narrower, the 3nm Pro narrowband filters enhance contrast of emission targets by lowering the unwanted background signal. Antlia \u003c\/span\u003e\u003cspan\u003eH-alpha\u003c\/span\u003e\u003cspan\u003e 3nm Pro filter\u003c\/span\u003e\u003cspan\u003es\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e\u003cspan\u003eare\u003c\/span\u003e\u003cspan\u003e designed to deliver 88\u003c\/span\u003e\u003cspan\u003e% transmission at the 656.3nm line which provides you with the maximum signal and well defined nebulae structures.\u003c\/span\u003e\u003c\/p\u003e\n\n\u003cp\u003e\u003cspan\u003eConventional broader narrowband filters cause a heavy loss in transmission due to the strong Center Wavelength (CWL)-shift. We guarantee T\u0026gt;88% within 1nm range of the center bandwidth,\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e\u003cspan\u003ewhich means that the 3nm Pro narrowband filter can guarantee high transmittance for working with both long focal ratios and fast optical systems. \u003c\/span\u003e\u003cspan\u003eB\u003c\/span\u003e\u003cspan\u003elue\u003c\/span\u003e\u003cspan\u003e-\u003c\/span\u003e\u003cspan\u003eshift data shows that Antlia 3nm Pro filters can be used with nearly all systems as fast as f\/3 with minimal loss in emission signal\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e\u003cspan\u003eand meets the requirements of fast optics like Hyperstar and RASA.\u003c\/span\u003e\u003c\/p\u003e\n\n\u003cp\u003e\u003cspan\u003eThe out of band blocking specification is rated OD\u003c\/span\u003e\u003cspan\u003e5\u003c\/span\u003e\u003cspan\u003e (0.\u003c\/span\u003e\u003cspan\u003e00\u003c\/span\u003e\u003cspan\u003e1%) which delivers an excellent \u003c\/span\u003e\u003cspan\u003eSNR(\u003c\/span\u003e\u003cspan\u003esignal to noise ratio\u003c\/span\u003e\u003cspan\u003e)\u003c\/span\u003e\u003cspan\u003e and effective cut-off rate to minimize interference from other wavelengths.\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e\u003cspan\u003eImproved \u003c\/span\u003e\u003cspan\u003es\u003c\/span\u003e\u003cspan\u003eharp cut-off astrophotography 3nm Pro filters are designed to minimize halos around bright stars.\u003c\/span\u003e\u003c\/p\u003e\n\n\u003ch3\u003eApplication and Performance:\u003c\/h3\u003e\n\n\u003cul\u003e\n\t\u003cli\u003e\u003cspan\u003eUltra-narrow 3.0 nm bandwidths, designed for astronomy imaging in both light polluted areas and at dark sites；\u003c\/span\u003e\u003c\/li\u003e\n\t\u003cli\u003e\u003cspan\u003eSuitable for imaging of H-Alpha emission in nebulae, planetary nebulae and supernova remnants;\u003c\/span\u003e\u003c\/li\u003e\n\t\u003cli\u003e\u003cspan\u003eWith the Ha, SII, OIII set of filters you are able to process your images to achieve the impressive Hubble color palette;\u003c\/span\u003e\u003c\/li\u003e\n\t\u003cli\u003e\u003cspan\u003eWith the Ha and OIII filters these can be used to achieve great narrowband results using the Bi-Color process;\u003c\/span\u003e\u003c\/li\u003e\n\t\u003cli\u003e\u003cspan\u003eHigh transmission of typically 90% and sharp cut-off delivers an excellent boost in contrast for Ha emitting objects;\u003c\/span\u003e\u003c\/li\u003e\n\t\u003cli\u003e\u003cspan\u003eAll Antlia Narrowband filters are edge blackened to minimize interference from stray light;\u003c\/span\u003e\u003c\/li\u003e\n\t\u003cli\u003e\u003cspan\u003eThis filter is not suited to deep sky objects that do not contain Ha emissions. It can be used to image Ha regions in galaxies and such images can be combined into LRGB images to better highlight the Ha emitting regions of galaxies.\u003c\/span\u003e\u003c\/li\u003e\n\t\u003cli\u003e\n\u003cspan\u003e\u003c\/span\u003e\n\t\u003cp\u003e\u003cspan\u003eExtends imaging time when the moon is up\u003c\/span\u003e\u003c\/p\u003e\n\t\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003c\/p\u003e\n\n\u003ch3\u003eTechnical Data:\u003c\/h3\u003e\n\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eBasic Substrate:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Schott optical substrate\u003c\/span\u003e\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eFilter Thickness:   \u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e3mm+\/-0.05mm for Dia50mm unmounted\u003c\/span\u003e\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eFWHM (Full width at half maximum): \u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e3nm\u003c\/span\u003e\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eCWL (Central Wavelength)\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e: \u003c\/span\u003e\u003cspan\u003e656.3nm\u003c\/span\u003e\u003cspan\u003enm\u003c\/span\u003e\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003ePeak Transmission:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e ＞88%\u003c\/span\u003e\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eBlocking: \u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e\u0026gt; 5 OD(0.001%\u003c\/span\u003e\u003cspan\u003e out of band blocking\u003c\/span\u003e\u003cspan\u003e) @ 300-1000nm\u003c\/span\u003e\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eSurface Quality: \u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003eS\/D (scratch\/dig)= 60\/40 (Refer to MIL-O-13830)\u003c\/span\u003e\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eTransmitted Wavefront: \u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003eLambda\/4 or better.\u003c\/span\u003e\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eParallelism: \u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003eless than 30 arcsec\u003c\/span\u003e\u003c\/p\u003e\n\n\u003cp\u003e\u003cspan\u003eSingle \/ Non-glued substrate\u003c\/span\u003e\u003c\/p\u003e\n\n\u003cp\u003e\u003c\/p\u003e\n\n\u003cp\u003e\u003c\/p\u003e\n\n\u003cp\u003e\u003cspan\u003eWarranty: 3-years against delamination\u003c\/span\u003e\u003c\/p\u003e\n\n\u003cul\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eAvailable Sizes：\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*50mm，65*65 square (3mm thickness)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eNot Recommended:\u003c\/h3\u003e\n\n\u003cul\u003e\n\t\u003cli\u003eSolar Observing and imaging.\u003c\/li\u003e\n\t\u003cli\u003eVisual observation\n\t\u003cul\u003e\n\t\t\u003cli\u003e\n\u003cspan\u003eIMPORTANT!\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003eDO NOT LOOK AT THE SUN WITH ANTLIA FILTERS.\u003cbr\u003e\n\t\tSerious eye damage will result if you fail to observe the warning.\u003c\/li\u003e\n\t\u003c\/ul\u003e\n\t\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eUSER CONTRIBUTION:\u003c\/p\u003e\n\n\u003cp\u003e\u003ca href=\"https:\/\/www.365astronomy.com\/image\/cache\/wp\/ij\/content\/horsehead-nebula-antlia-filter-h-alpha-3.5nm.webp\"\u003e\u003cimg alt=\"\" src=\"https:\/\/www.365astronomy.com\/image\/cache\/wp\/ij\/content\/horsehead-nebula-antlia-filter-h-alpha-3.5nm.webp\"\u003e\u003c\/a\u003e\u003c\/p\u003e\n\n\u003cp\u003e\u003c\/p\u003e","brand":"Antlia","offers":[{"title":"Default Title","offer_id":42278582452401,"sku":"ANT-3.0HA-50PRO","price":513.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0523\/1650\/4241\/files\/antlia-pro-ultra-narrowband-30nm-h-alpha-filter-50mm-unmounted-345236.jpg?v=1782294725"},{"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-pro-ultra-narrowband-3nm-h-alpha-filter-1-25-for-imaging","title":"Antlia PRO Ultra Narrowband 3nm H-alpha Filter - 1.25\" for Imaging","description":"\u003ch1 data-mce-fragment=\"1\"\u003eAntlia H-Alpha (Ha) 3.0nm PRO Ultra-Narrowband Filter - Mounted in 1.25\" Filter Cell (31.8mm)\u003c\/h1\u003e\n\u003ch2 data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eJust arrived! Now these Antlia filters got even better! 3nm bandwidth instead of 3.5nm! \u003c\/span\u003e\u003c\/h2\u003e\n\u003cp data-mce-fragment=\"1\"\u003eThe Antlia H-Alpha (Ha) 3.0nm filter is suitable for imaging H-Alpha emissions from nebulae, planetary nebulae and supernova remnants.\u003cbr data-mce-fragment=\"1\"\u003eThe 3.0nm bandwidth delivers a high transmission at a centre wavelength of 656.3nm. The extreme narrowness in bandwidth enables Astro-imaging from heavily light polluted locations and delivers improved contrast at darker sites. The filter effectively suppresses interference from other wavelengths, especially artificial mercury and sodium lamps.\u003cbr data-mce-fragment=\"1\"\u003eAntlia narrowband filters are designed to bring out the faintest features in nebulosity by reducing the unwanted background frequencies.\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eThe narrower the filter, the better. Our H A lpha filter is designed to deliver 90 % transmission at the 656.3nm line. The out of band blocking specification is rated OD3 (0.1%) which delivers an excellent signal to noise ratio and effective cut off rate to minimize interference from other wavelengths.\u003cbr data-mce-fragment=\"1\"\u003eA sharp cut off rate is a very important performance index since it is designed to sharply attenuate off-band wavelengths. The result is that the Antlia Ha filter delivers excellent contrast with extremely dark backgrounds whilst delivering a high transmission of the Ha signal. The sharp cut-off also minimizes the effect of halos around bright stars.\u003cbr data-mce-fragment=\"1\"\u003eIn the production process, we use very strict quality control standards. Each filter is individually tested and scanned to ensure that the product meets our high-performance parameters. Our exacting attention to tolerances requires each substrate to have a uniform thickness that achieves no more + -0.05mm deviation from specification.\u003c\/p\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003eApplication and Performance:\u003c\/h3\u003e\n\u003cul data-mce-fragment=\"1\"\u003e\n\u003cli data-mce-fragment=\"1\"\u003eUltra-narrow 3.0 nm bandwidths, designed for astronomy imaging in both light polluted areas and at dark sites；\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003eSuitable for imaging of H-Alpha emission in nebulae, planetary nebulae and supernova remnants;\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003eWith the Ha, SII, OIII set of filters you are able to process your images to achieve the impressive Hubble colour palette;\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003eWith the Ha and OIII filters these can be used to achieve great narrowband results using the Bi-Colour process;\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003eHigh transmission of typically 90% and sharp cut-off delivers an excellent boost in contrast for Ha emitting objects;\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003eAll Antlia Narrowband filters are edge blackened to minimize interference from stray light;\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003eThis filter is not suited to deep sky objects that do not contain Ha emissions. It can be used to image Ha regions in galaxies and such images can be combined into LRGB images to better highlight the Ha emitting regions of galaxies.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003ca href=\"https:\/\/www.365astronomy.com\/image\/cache\/wp\/ij\/content\/Antlia-ultra-narrowband-Ha-3.5nm-Filter-Spectrum-transmission-Curve-a.webp\" data-mce-fragment=\"1\"\u003e\u003cimg alt=\"\" src=\"https:\/\/www.365astronomy.com\/image\/cache\/wp\/ij\/content\/Antlia-ultra-narrowband-Ha-3.5nm-Filter-Spectrum-transmission-Curve-a.webp\" data-mce-fragment=\"1\"\u003e\u003c\/a\u003e\u003c\/p\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003eTechnical Data:\u003c\/h3\u003e\n\u003cul data-mce-fragment=\"1\"\u003e\n\u003cli data-mce-fragment=\"1\"\u003eSchott optical substrate\n\u003cul data-mce-fragment=\"1\"\u003e\n\u003cli data-mce-fragment=\"1\"\u003e1.25”, 2” mounted, 31mm,36mm diameter (2mm+\/-0.05mm)\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e50mm dia，50*50mm，65*65mm square (3mm+\/-0.05mm)\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003eSurface Quality: 60\/40 (Refer to MIL-O-13830)\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e2 sides fine-optically polished to ensure accurate 1\/4 wavefront\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e30 arcsec parallelism\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003eCentre-Wavelength of Antlia H-Alpha 3.0nm filter: 656.3nm\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003eH-Alpha 656.3nm T＞90%, 90 % transmission at H-Alpha line at 656.3nm\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\u003cb data-mce-fragment=\"1\"\u003emin OD5（0.001%）@ 300-1000nm\u003c\/b\u003e\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003eBoth sides with multi-layer anti-reflection coating\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003eSingle \/ Non-glued substrate\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003eFilter Cell (specifications for cell mounted filters only):\u003c\/h3\u003e\n\u003cul data-mce-fragment=\"1\"\u003e\n\u003cli data-mce-fragment=\"1\"\u003e1.25” (M26*0.6)，2” (M48*0.75)\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003eUltra-thin filter cell to minimize vignetting by maximize possible clear aperture\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003eBlack Anodized Finish\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003eNon-Fading Laser Engraving\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003eAvailable Sizes：\u003c\/h3\u003e\n\u003cul data-mce-fragment=\"1\"\u003e\n\u003cli data-mce-fragment=\"1\"\u003eMounted： 1.25” \u0026amp; 2” (2mm thickness)\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003eUnmounted Diameter 31mm，Dia 36mm (2mm thickness)\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003eUnmounted Diameter 50mm (3mm thickness)\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003eUnmounted：50*50mm，65*65 square (3mm thickness)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003eNot Recommended:\u003c\/h3\u003e\n\u003cul data-mce-fragment=\"1\"\u003e\n\u003cli data-mce-fragment=\"1\"\u003eSolar Observing and imaging\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003eVisual observation\n\u003cul data-mce-fragment=\"1\"\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cspan data-mce-fragment=\"1\"\u003eIMPORTANT!\u003c\/span\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003eDO NOT LOOK AT THE SUN WITH ANTLIA FILTERS.\u003cbr data-mce-fragment=\"1\"\u003eSerious eye damage will result if you fail to observe the warning.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-mce-fragment=\"1\"\u003eUSER CONTRIBUTION:\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003ca href=\"https:\/\/www.365astronomy.com\/image\/cache\/wp\/ij\/content\/horsehead-nebula-antlia-filter-h-alpha-3.5nm.webp\" data-mce-fragment=\"1\"\u003e\u003cimg alt=\"\" src=\"https:\/\/www.365astronomy.com\/image\/cache\/wp\/ij\/content\/horsehead-nebula-antlia-filter-h-alpha-3.5nm.webp\" data-mce-fragment=\"1\"\u003e\u003c\/a\u003e\u003c\/p\u003e\n\u003ch4 data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003eMELOTTE 15 – “THE HEART OF THE HEART NEBULA” (IMAGE BELOW...)\u003c\/strong\u003e\u003c\/h4\u003e\n\u003cul data-mce-fragment=\"1\"\u003e\n\u003cli data-mce-fragment=\"1\"\u003eSubject:                              Melotte 15 – “The Heart of the Heart Nebula”\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003eImaging OTA:                     Sharpstar SCA260 – 1300mm, f\/5.0\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003eImaging Camera:               ZWO ASI2600MM-PRO\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003eFilters:                      \u003cwbr data-mce-fragment=\"1\"\u003e           Antlia 2” Narrowband: Ha (3nm); Sii (3.5nm); Oiii (3.5nm)\u003c\/wbr\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003eFilter Wheel:                      ZWO 7 x 2”\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003eGuide System:                    ZWO OAG-L with ZWO ASI174MM camera\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003eMount:                        \u003cwbr data-mce-fragment=\"1\"\u003e        Skywatcher EQ6-R\u003c\/wbr\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003eCapture Details:                 Ha: 30 x 300s; Sii: 26 x 300s; Oiii: 26 x 300s\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003eIntegration time: 6h40’\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003eBortle 4 over 4 nights\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-mce-fragment=\"1\"\u003eCourtesy of Alistair Scobie\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e(Please note, below is a 900px wide version, but if you click on it, you will see a 1600px wide version. The original was even larger, but we had to reduce it to 1600pixels width as that's the max our shopping cart system allows...)\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003ca href=\"https:\/\/www.365astronomy.com\/image\/cache\/wp\/lj\/product\/SHARPSTAR\/SCA260\/Melotte_15_B-Alistair-Scobie-SCA260-ASI2600MM-PRO.webp\" data-mce-fragment=\"1\"\u003e\u003cimg alt=\"\" height=\"1143\" src=\"https:\/\/www.365astronomy.com\/image\/cache\/wp\/lj\/product\/SHARPSTAR\/SCA260\/Melotte_15_B-Alistair-Scobie-SCA260-ASI2600MM-PRO.webp\" width=\"1600\" data-mce-fragment=\"1\"\u003e\u003c\/a\u003e\u003c\/p\u003e","brand":"Antlia","offers":[{"title":"Default Title","offer_id":42282582704305,"sku":"ANT-3.0HA-1.25PRO","price":267.0,"currency_code":"GBP","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0523\/1650\/4241\/files\/antlia-pro-ultra-narrowband-3nm-h-alpha-filter-125-637515.webp?v=1782294730"},{"product_id":"antlia-pro-ultra-narrowband-3nm-h-alpha-filter-2","title":"ANTLIA PRO Ultra Narrowband 3nm H-alpha Filter - 2\"","description":"\u003ch1\u003eAntlia H-Alpha (Ha) 3.0nm PRO Ultra-Narrowband Filter - Mounted in 2\" Filter Cell (50.4mm)\u003c\/h1\u003e\n\u003ch2\u003e\u003cspan\u003eNow these Antlia filters got even better! 3nm bandwidth instead of 3.5nm! \u003c\/span\u003e\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eDescription of the new PRO 3nm filters is under construction!\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe Antlia H-Alpha (Ha) 3.0nm filter is suitable for imaging H-Alpha emissions from nebulae, planetary nebulae and supernova remnants.\u003cbr\u003eThe 3.0nm bandwidth delivers a high transmission at a centre wavelength of 656.3nm. The extreme narrowness in bandwidth enables Astro-imaging from heavily light polluted locations and delivers improved contrast at darker sites. The filter effectively suppresses interference from other wavelengths, especially artificial mercury and sodium lamps.\u003cbr\u003eAntlia narrowband filters are designed to bring out the faintest features in nebulosity by reducing the unwanted background frequencies.\u003c\/p\u003e\n\u003cp\u003eThe narrower the filter, the better. Our H Alpha filter is designed to deliver 90 % transmission at the 656.3nm line. The out of band blocking specification is rated OD3 (0.1%) which delivers an excellent signal to noise ratio and effective cut off rate to minimize interference from other wavelengths.\u003cbr\u003eA sharp cut off rate is a very important performance index since it is designed to sharply attenuate off-band wavelengths. The result is that the Antlia Ha filter delivers excellent contrast with extremely dark backgrounds whilst delivering a high transmission of the Ha signal. The sharp cut-off also minimizes the effect of halos around bright stars.\u003cbr\u003eIn the production process, we use very strict quality control standards. Each filter is individually tested and scanned to ensure that the product meets our high-performance parameters. Our exacting attention to tolerances requires each substrate to have a uniform thickness that achieves no more + -0.05mm deviation from specification.\u003c\/p\u003e\n\u003ch3\u003eApplication and Performance:\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eUltra-narrow 3.0 nm bandwidths, designed for astronomy imaging in both light polluted areas and at dark sites；\u003c\/li\u003e\n\u003cli\u003eSuitable for imaging of H-Alpha emission in nebulae, planetary nebulae and supernova remnants;\u003c\/li\u003e\n\u003cli\u003eWith the Ha, SII, OIII set of filters you are able to process your images to achieve the impressive Hubble colour palette;\u003c\/li\u003e\n\u003cli\u003eWith the Ha and OIII filters these can be used to achieve great narrowband results using the Bi-Colour process;\u003c\/li\u003e\n\u003cli\u003eHigh transmission of typically 90% and sharp cut-off delivers an excellent boost in contrast for Ha emitting objects;\u003c\/li\u003e\n\u003cli\u003eAll Antlia Narrowband filters are edge blackened to minimize interference from stray light;\u003c\/li\u003e\n\u003cli\u003eThis filter is not suited to deep sky objects that do not contain Ha emissions. It can be used to image Ha regions in galaxies and such images can be combined into LRGB images to better highlight the Ha emitting regions of galaxies.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/www.365astronomy.com\/image\/cache\/wp\/ij\/content\/Antlia-ultra-narrowband-Ha-3.5nm-Filter-Spectrum-transmission-Curve-a-01.webp\"\u003e\u003cimg alt=\"\" src=\"https:\/\/www.365astronomy.com\/image\/cache\/wp\/ij\/content\/Antlia-ultra-narrowband-Ha-3.5nm-Filter-Spectrum-transmission-Curve-a-01.webp\"\u003e\u003c\/a\u003e\u003c\/p\u003e\n\u003ch3\u003eTechnical Data:\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eSchott optical substrate\n\u003cul\u003e\n\u003cli\u003e1.25”, 2” mounted, 31mm,36mm diameter (2mm+\/-0.05mm)\u003c\/li\u003e\n\u003cli\u003e50mm dia，50*50mm，65*65mm square (3mm+\/-0.05mm)\u003c\/li\u003e\n\u003cli\u003eSurface Quality: 60\/40 (Refer to MIL-O-13830)\u003c\/li\u003e\n\u003cli\u003e2 sides fine-optically polished to ensure accurate 1\/4 wave\u003c\/li\u003e\n\u003cli\u003efront\u003c\/li\u003e\n\u003cli\u003e30 arcsec parallelism\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003eCentre-Wavelength of Antlia H-Alpha 3.0nm filter: 656.3nm\u003c\/li\u003e\n\u003cli\u003eH-Alpha 656.3nm T＞90%, 90 % transmission at H-Alpha line at 656.3nm\u003c\/li\u003e\n\u003cli\u003e\u003cb\u003emin OD5（0.001%）@ 300-1000nm\u003c\/b\u003e\u003c\/li\u003e\n\u003cli\u003eBoth sides with multi-layer anti-reflection coating\u003c\/li\u003e\n\u003cli\u003eSingle \/ Non-glued substrate\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFilter Cell (specifications for cell mounted filters only):\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e1.25” (M26*0.6)，2” (M48*0.75)\u003c\/li\u003e\n\u003cli\u003eUltra-thin filter cell to minimize vignetting by maximize possible clear aperture\u003c\/li\u003e\n\u003cli\u003eBlack Anodized Finish\u003c\/li\u003e\n\u003cli\u003eNon-Fading Laser Engraving\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eAvailable Sizes：\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eMounted： 1.25” \u0026amp; 2” (2mm thickness)\u003c\/li\u003e\n\u003cli\u003eUnmounted Diameter 31mm，Dia 36mm (2mm thickness)\u003c\/li\u003e\n\u003cli\u003eUnmounted Diameter 50mm (3mm thickness)\u003c\/li\u003e\n\u003cli\u003eUnmounted：50*50mm，65*65 square (3mm thickness)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eNot Recommended:\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eSolar Observing and imaging\u003c\/li\u003e\n\u003cli\u003eVisual observation\n\u003cul\u003e\n\u003cli\u003e\n\u003cspan\u003eIMPORTANT!\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003eDO NOT LOOK AT THE SUN WITH ANTLIA FILTERS.\u003cbr\u003eSerious eye damage will result if you fail to observe the warning.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eUSER CONTRIBUTIONS:\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/www.365astronomy.com\/image\/cache\/wp\/ij\/content\/horsehead-nebula-antlia-filter-h-alpha-3.5nm.webp\"\u003e\u003cimg alt=\"\" src=\"https:\/\/www.365astronomy.com\/image\/cache\/wp\/ij\/content\/horsehead-nebula-antlia-filter-h-alpha-3.5nm.webp\"\u003e\u003c\/a\u003e\u003c\/p\u003e\n\u003ch4\u003e\u003cstrong\u003eMELOTTE 15 – “THE HEART OF THE HEART NEBULA” (BELOW IMAGE...)\u003c\/strong\u003e\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eSubject:                              Melotte 15 – “The Heart of the Heart Nebula”\u003c\/li\u003e\n\u003cli\u003eImaging OTA:                     Sharpstar SCA260 – 1300mm, f\/5.0\u003c\/li\u003e\n\u003cli\u003eImaging Camera:               ZWO ASI2600MM-PRO\u003c\/li\u003e\n\u003cli\u003eFilters:                      \u003cwbr\u003e           Antlia 2” Narrowband: Ha (3nm); Sii (3.5nm); Oiii (3.5nm)\u003c\/wbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eFilter Wheel:                      ZWO 7 x 2”\u003c\/li\u003e\n\u003cli\u003eGuide System:                    ZWO OAG-L with ZWO ASI174MM camera\u003c\/li\u003e\n\u003cli\u003eMount:                        \u003cwbr\u003e        Skywatcher EQ6-R\u003c\/wbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eCapture Details:                 Ha: 30 x 300s; Sii: 26 x 300s; Oiii: 26 x 300s\u003c\/li\u003e\n\u003cli\u003eIntegration time: 6h40’\u003c\/li\u003e\n\u003cli\u003eBortle 4 over 4 nights\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eCourtesy of Alistair Scobie\u003c\/p\u003e\n\u003cp\u003e(Please note, below is a 900px wide version, but if you click on it, you will see a 1600px wide version. The original was even larger, but we had to reduce it to 1600pixels width as that's the max our shopping cart system allows...)\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/www.365astronomy.com\/image\/cache\/wp\/lj\/product\/SHARPSTAR\/SCA260\/Melotte_15_B-Alistair-Scobie-SCA260-ASI2600MM-PRO.webp\"\u003e\u003cimg alt=\"\" height=\"1143\" src=\"https:\/\/www.365astronomy.com\/image\/cache\/wp\/lj\/product\/SHARPSTAR\/SCA260\/Melotte_15_B-Alistair-Scobie-SCA260-ASI2600MM-PRO.webp\" width=\"1600\"\u003e\u003c\/a\u003e\u003c\/p\u003e","brand":"Antlia","offers":[{"title":"Default Title","offer_id":42282584932529,"sku":"ANT-3.0HA-2PRO","price":414.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0523\/1650\/4241\/files\/antlia-pro-ultra-narrowband-3nm-h-alpha-filter-2-827597.webp?v=1782294732"},{"product_id":"antlia-pro-ultra-narrowband-3nm-h-alpha-filter-31mm-unmounted","title":"Antlia PRO Ultra Narrowband 3nm H-alpha Filter - 31mm Unmounted","description":"\u003ch1\u003eAntlia PRO H-Alpha (Ha) 3.0nm Ultra-Narrowband Filter - 31mm Unmounted (glass only)\u003c\/h1\u003e\n\u003ch2\u003e\u003cspan\u003eJust arrived! Now these Antlia filters got even better! 3nm bandwidth instead of 3.5nm! \u003c\/span\u003e\u003c\/h2\u003e\n\u003cp\u003e The Antlia H-Alpha (Ha) 3.0nm filter is suitable for imaging H-Alpha emissions from nebulae, planetary nebulae and supernova remnants.\u003cbr\u003eThe 3.0nm bandwidth delivers a high transmission at a centre wavelength of 656.3nm. The extreme narrowness in bandwidth enables Astro-imaging from heavily light polluted locations and delivers improved contrast at darker sites. The filter effectively suppresses interference from other wavelengths, especially artificial mercury and sodium lamps.\u003cbr\u003eAntlia narrowband filters are designed to bring out the faintest features in nebulosity by reducing the unwanted background frequencies.\u003c\/p\u003e\n\u003cp\u003eThe narrower the filter, the better. Our H Alpha filter is designed to deliver 90 % transmission at the 656.3nm line. The out of band blocking specification is rated OD3 (0.1%) which delivers an excellent signal to noise ratio and effective cut off rate to minimize interference from other wavelengths.\u003cbr\u003eA sharp cut off rate is a very important performance index since it is designed to sharply attenuate off-band wavelengths. The result is that the Antlia Ha filter delivers excellent contrast with extremely dark backgrounds whilst delivering a high transmission of the Ha signal. The sharp cut-off also minimizes the effect of halos around bright stars.\u003cbr\u003eIn the production process, we use very strict quality control standards. Each filter is individually tested and scanned to ensure that the product meets our high-performance parameters. Our exacting attention to tolerances requires each substrate to have a uniform thickness that achieves no more + -0.05mm deviation from specification.\u003c\/p\u003e\n\u003ch3\u003eApplication and Performance:\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eUltra-narrow 3.0 nm bandwidths, designed for astronomy imaging in both light polluted areas and at dark sites；\u003c\/li\u003e\n\u003cli\u003eSuitable for imaging of H-Alpha emission in nebulae, planetary nebulae and supernova remnants;\u003c\/li\u003e\n\u003cli\u003eWith the Ha, SII, OIII set of filters you are able to process your images to achieve the impressive Hubble color palette;\u003c\/li\u003e\n\u003cli\u003eWith the Ha and OIII filters these can be used to achieve great narrowband results using the Bi-Color process;\u003c\/li\u003e\n\u003cli\u003eHigh transmission of typically 90% and sharp cut-off delivers an excellent boost in contrast for Ha emitting objects;\u003c\/li\u003e\n\u003cli\u003eAll Antlia Narrowband filters are edge blackened to minimize interference from stray light;\u003c\/li\u003e\n\u003cli\u003eThis filter is not suited to deep sky objects that do not contain Ha emissions. It can be used to image Ha regions in galaxies and such images can be combined into LRGB images to better highlight the Ha emitting regions of galaxies.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/www.365astronomy.com\/image\/cache\/wp\/ij\/content\/Antlia-ultra-narrowband-Ha-3.5nm-Filter-Spectrum-transmission-Curve-a-01.webp\"\u003e\u003cimg src=\"https:\/\/www.365astronomy.com\/image\/cache\/wp\/ij\/content\/Antlia-ultra-narrowband-Ha-3.5nm-Filter-Spectrum-transmission-Curve-a-01.webp\" alt=\"\"\u003e\u003c\/a\u003e\u003c\/p\u003e\n\u003ch3\u003eTechnical Data:\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eSchott optical substrate\n\u003cul\u003e\n\u003cli\u003e1.25”, 2” mounted, 31mm,36mm dia (2mm+\/-0.05mm)\u003c\/li\u003e\n\u003cli\u003e50mm dia，50*50mm，65*65mm square (3mm+\/-0.05mm)\u003c\/li\u003e\n\u003cli\u003eSurface Quality: 60\/40 (Refer to MIL-O-13830)\u003c\/li\u003e\n\u003cli\u003e2 sides fine-optically polished to ensure accurate 1\/4 wavefront\u003c\/li\u003e\n\u003cli\u003e30 arcsec parallelism\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003eCenter-Wavelength of Antlia H-Alpha 3.0nm filter: 656.3nm\u003c\/li\u003e\n\u003cli\u003eH-Alpha 656.3nm T＞90%, 90 % transmission at H-Alpha line at 656.3nm\u003c\/li\u003e\n\u003cli\u003e\u003cb\u003emin OD5（0.001%）@ 300-1000nm\u003c\/b\u003e\u003c\/li\u003e\n\u003cli\u003eBoth sides with multi-layer anti-reflection coating\u003c\/li\u003e\n\u003cli\u003eSingle \/ Non-glued substrate\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFilter Cell (specifications for cell mounted filters only):\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e1.25” (M26*0.6)，2” (M48*0.75)\u003c\/li\u003e\n\u003cli\u003eUltra-thin filter cell to minimize vignetting by maximize possible clear aperture\u003c\/li\u003e\n\u003cli\u003eBlack Anodized Finish\u003c\/li\u003e\n\u003cli\u003eNon-Fading Laser Engraving\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eAvailable Sizes：\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eMounted： 1.25” \u0026amp; 2” (2mm thickness)\u003c\/li\u003e\n\u003cli\u003eUnmounted：Dia 31mm，Dia 36mm (2mm thickness)\u003c\/li\u003e\n\u003cli\u003eUnmounted：Dia 50mm (3mm thickness)\u003c\/li\u003e\n\u003cli\u003eUnmounted：50*50mm，65*65 square (3mm thickness)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eNot Recommended:\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eSolar Observing and imaging\u003c\/li\u003e\n\u003cli\u003eVisual observation\n\u003cul\u003e\n\u003cli\u003e\n\u003cspan\u003eIMPORTANT!\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003eDO NOT LOOK AT THE SUN WITH ANTLIA FILTERS.\u003cbr\u003eSerious eye damage will result if you fail to observe the warning.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eUSER CONTRIBUTION:\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/www.365astronomy.com\/image\/cache\/wp\/ij\/content\/horsehead-nebula-antlia-filter-h-alpha-3.5nm.webp\"\u003e\u003cimg src=\"https:\/\/www.365astronomy.com\/image\/cache\/wp\/ij\/content\/horsehead-nebula-antlia-filter-h-alpha-3.5nm.webp\" alt=\"\"\u003e\u003c\/a\u003e\u003c\/p\u003e\n\u003ch4\u003e\u003cstrong\u003eMELOTTE 15 – “THE HEART OF THE HEART NEBULA” (IMAGE FURTHER BELOW...)\u003c\/strong\u003e\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eSubject:                              Melotte 15 – “The Heart of the Heart Nebula”\u003c\/li\u003e\n\u003cli\u003eImaging OTA:                     Sharpstar SCA260 – 1300mm, f\/5.0\u003c\/li\u003e\n\u003cli\u003eImaging Camera:               ZWO ASI2600MM-PRO\u003c\/li\u003e\n\u003cli\u003eFilters:                      \u003cwbr\u003e           Antlia 2” Narrowband: Ha (3nm); Sii (3.5nm); Oiii (3.5nm)\u003c\/wbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eFilter Wheel:                      ZWO 7 x 2”\u003c\/li\u003e\n\u003cli\u003eGuide System:                    ZWO OAG-L with ZWO ASI174MM camera\u003c\/li\u003e\n\u003cli\u003eMount:                        \u003cwbr\u003e        Skywatcher EQ6-R\u003c\/wbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eCapture Details:                 Ha: 30 x 300s; Sii: 26 x 300s; Oiii: 26 x 300s\u003c\/li\u003e\n\u003cli\u003eIntegration time: 6h40’\u003c\/li\u003e\n\u003cli\u003eBortle 4 over 4 nights\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eCourtesy of Alistair Scobie\u003c\/p\u003e\n\u003cp\u003e(Please note, below is a 900px wide version, but if you click on it, you will see a 1600px wide version. The original was even larger, but we had to reduce it to 1600pixels width as that's the max our shopping cart system allows...)\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/www.365astronomy.com\/image\/cache\/wp\/lj\/product\/SHARPSTAR\/SCA260\/Melotte_15_B-Alistair-Scobie-SCA260-ASI2600MM-PRO.webp\"\u003e\u003cimg width=\"1600\" src=\"https:\/\/www.365astronomy.com\/image\/cache\/wp\/lj\/product\/SHARPSTAR\/SCA260\/Melotte_15_B-Alistair-Scobie-SCA260-ASI2600MM-PRO.webp\" height=\"1143\" alt=\"\"\u003e\u003c\/a\u003e\u003c\/p\u003e\n\u003ch2\u003e\n\u003cspan\u003e\u003c\/span\u003e\u003cbr\u003e\n\u003c\/h2\u003e","brand":"Antlia","offers":[{"title":"Default Title","offer_id":42282590535857,"sku":"ANT-3.0HA-31PRO","price":288.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0523\/1650\/4241\/files\/antlia-pro-ultra-narrowband-3nm-h-alpha-filter-31mm-unmounted-705251.webp?v=1782294736"},{"product_id":"antlia-pro-ultra-narrowband-3nm-h-alpha-filter-36mm-unmounted","title":"Antlia PRO Ultra Narrowband 3nm H-alpha Filter - 36mm Unmounted","description":"\u003cdiv style=\"color: #000000; background: #ffffff; padding: 20px; border-radius: 10px; line-height: 1.7; font-size: 16px;\"\u003e\n\u003ch2\u003eAntlia PRO H-Alpha (Ha) 3.0 nm Ultra-Narrowband Filter – 31 mm Unmounted\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eJust arrived!\u003c\/strong\u003e The new \u003cstrong\u003eAntlia PRO 3.0 nm series\u003c\/strong\u003e delivers even better performance than previous 3.5 nm models.\u003c\/p\u003e\n\u003cp\u003eThe \u003cstrong\u003eAntlia H-Alpha (Ha) 3.0 nm filter\u003c\/strong\u003e is designed for capturing fine detail in nebulae, planetary nebulae, and supernova remnants. With a precise \u003cstrong\u003e3.0 nm bandwidth\u003c\/strong\u003e centred on 656.3 nm, it provides high transmission of H-Alpha emissions while strongly rejecting unwanted light from artificial sources such as mercury and sodium lamps.\u003c\/p\u003e\n\u003cp\u003eIts ultra-narrow design allows deep-sky imaging even under heavy light pollution, producing strong contrast and exceptionally dark backgrounds. At darker sites, the filter brings out the faintest nebular structures with outstanding clarity.\u003c\/p\u003e\n\u003ch3\u003eOptical Performance\u003c\/h3\u003e\n\u003cul style=\"text-align: left; margin-left: 25px;\"\u003e\n\u003cli\u003eUltra-narrow \u003cstrong\u003e3.0 nm bandwidth\u003c\/strong\u003e centred at 656.3 nm.\u003c\/li\u003e\n\u003cli\u003eTypical transmission of \u003cstrong\u003e90 %\u003c\/strong\u003e for the H-Alpha signal.\u003c\/li\u003e\n\u003cli\u003eExcellent out-of-band blocking rated at \u003cstrong\u003eOD3 (0.1 %)\u003c\/strong\u003e to maximise signal-to-noise ratio.\u003c\/li\u003e\n\u003cli\u003eSharp cut-off design minimises halos and delivers high contrast with deep black backgrounds.\u003c\/li\u003e\n\u003cli\u003eEach filter individually tested and scanned to meet Antlia’s strict optical standards.\u003c\/li\u003e\n\u003cli\u003eSubstrate thickness tolerance within ±0.05 mm for precise optical alignment.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eApplications\u003c\/h3\u003e\n\u003cul style=\"text-align: left; margin-left: 25px;\"\u003e\n\u003cli\u003eIdeal for imaging H-Alpha emission nebulae, planetary nebulae, and supernova remnants.\u003c\/li\u003e\n\u003cli\u003eWorks perfectly with \u003cstrong\u003eHa, S II, O III\u003c\/strong\u003e filters for full narrowband or Hubble-palette imaging.\u003c\/li\u003e\n\u003cli\u003eExcellent results with \u003cstrong\u003eHa + O III\u003c\/strong\u003e Bi-Color combinations.\u003c\/li\u003e\n\u003cli\u003eSuitable for use in both light-polluted and dark-sky environments.\u003c\/li\u003e\n\u003cli\u003eAll Antlia narrowband filters are edge-blackened to prevent stray-light reflections.\u003c\/li\u003e\n\u003cli\u003eCan be combined with broadband LRGB data to enhance H-Alpha regions in galaxies.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cem\u003eNote:\u003c\/em\u003e This filter is intended for targets that emit in the H-Alpha wavelength and is not suitable for broadband deep-sky imaging of objects without Ha emissions.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/www.365astronomy.com\/image\/cache\/wp\/ij\/content\/Antlia-ultra-narrowband-Ha-3.5nm-Filter-Spectrum-transmission-Curve-a-01.webp\"\u003e\u003cimg alt=\"\" src=\"https:\/\/www.365astronomy.com\/image\/cache\/wp\/ij\/content\/Antlia-ultra-narrowband-Ha-3.5nm-Filter-Spectrum-transmission-Curve-a-01.webp\"\u003e\u003c\/a\u003e\u003c\/p\u003e\n\u003ch3\u003eTechnical Data:\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eSchott optical substrate\n\u003cul\u003e\n\u003cli\u003e1.25”, 2” mounted, 31mm,36mm dia (2mm+\/-0.05mm)\u003c\/li\u003e\n\u003cli\u003e50mm dia，50*50mm，65*65mm square (3mm+\/-0.05mm)\u003c\/li\u003e\n\u003cli\u003eSurface Quality: 60\/40 (Refer to MIL-O-13830)\u003c\/li\u003e\n\u003cli\u003e2 sides fine-optically polished to ensure accurate 1\/4 wavefront\u003c\/li\u003e\n\u003cli\u003e30 arcsec parallelism\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003eCenter-Wavelength of Antlia H-Alpha 3.0nm filter: 656.3nm\u003c\/li\u003e\n\u003cli\u003eH-Alpha 656.3nm T＞90%, 90 % transmission at H-Alpha line at 656.3nm\u003c\/li\u003e\n\u003cli\u003e\u003cb\u003emin OD5（0.001%）@ 300-1000nm\u003c\/b\u003e\u003c\/li\u003e\n\u003cli\u003eBoth sides with multi-layer anti-reflection coating\u003c\/li\u003e\n\u003cli\u003eSingle \/ Non-glued substrate\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFilter Cell (specifications for cell mounted filters only):\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e1.25” (M26*0.6)，2” (M48*0.75)\u003c\/li\u003e\n\u003cli\u003eUltra-thin filter cell to minimize vignetting by maximize possible clear aperture\u003c\/li\u003e\n\u003cli\u003eBlack Anodized Finish\u003c\/li\u003e\n\u003cli\u003eNon-Fading Laser Engraving\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eAvailable Sizes：\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eMounted： 1.25” \u0026amp; 2” (2mm thickness)\u003c\/li\u003e\n\u003cli\u003eUnmounted：Dia 31mm，Dia 36mm (2mm thickness)\u003c\/li\u003e\n\u003cli\u003eUnmounted：Dia 50mm (3mm thickness)\u003c\/li\u003e\n\u003cli\u003eUnmounted：50*50mm，65*65 square (3mm thickness)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eNot Recommended:\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eSolar Observing and imaging\u003c\/li\u003e\n\u003cli\u003eVisual observation\n\u003cul\u003e\n\u003cli\u003e\n\u003cspan\u003eIMPORTANT!\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003eDO NOT LOOK AT THE SUN WITH ANTLIA FILTERS.\u003cbr\u003eSerious eye damage will result if you fail to observe the warning.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eUSER CONTRIBUTION:\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/www.365astronomy.com\/image\/cache\/wp\/ij\/content\/horsehead-nebula-antlia-filter-h-alpha-3.5nm.webp\"\u003e\u003cimg alt=\"\" src=\"https:\/\/www.365astronomy.com\/image\/cache\/wp\/ij\/content\/horsehead-nebula-antlia-filter-h-alpha-3.5nm.webp\"\u003e\u003c\/a\u003e\u003c\/p\u003e\n\u003ch4\u003e\u003cstrong\u003eMELOTTE 15 – “THE HEART OF THE HEART NEBULA” (IMAGE FURTHER BELOW...)\u003c\/strong\u003e\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eSubject:                              Melotte 15 – “The Heart of the Heart Nebula”\u003c\/li\u003e\n\u003cli\u003eImaging OTA:                     Sharpstar SCA260 – 1300mm, f\/5.0\u003c\/li\u003e\n\u003cli\u003eImaging Camera:               ZWO ASI2600MM-PRO\u003c\/li\u003e\n\u003cli\u003eFilters:                      \u003cwbr\u003e           Antlia 2” Narrowband: Ha (3nm); Sii (3.5nm); Oiii (3.5nm)\u003c\/wbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eFilter Wheel:                      ZWO 7 x 2”\u003c\/li\u003e\n\u003cli\u003eGuide System:                    ZWO OAG-L with ZWO ASI174MM camera\u003c\/li\u003e\n\u003cli\u003eMount:                        \u003cwbr\u003e        Skywatcher EQ6-R\u003c\/wbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eCapture Details:                 Ha: 30 x 300s; Sii: 26 x 300s; Oiii: 26 x 300s\u003c\/li\u003e\n\u003cli\u003eIntegration time: 6h40’\u003c\/li\u003e\n\u003cli\u003eBortle 4 over 4 nights\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eCourtesy of Alistair Scobie\u003c\/p\u003e\n\u003cp\u003e(Please note, below is a 900px wide version, but if you click on it, you will see a 1600px wide version. The original was even larger, but we had to reduce it to 1600pixels width as that's the max our shopping cart system allows...)\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/www.365astronomy.com\/image\/cache\/wp\/lj\/product\/SHARPSTAR\/SCA260\/Melotte_15_B-Alistair-Scobie-SCA260-ASI2600MM-PRO.webp\"\u003e\u003cimg alt=\"\" height=\"1143\" src=\"https:\/\/www.365astronomy.com\/image\/cache\/wp\/lj\/product\/SHARPSTAR\/SCA260\/Melotte_15_B-Alistair-Scobie-SCA260-ASI2600MM-PRO.webp\" width=\"1600\"\u003e\u003c\/a\u003e\u003c\/p\u003e","brand":"Antlia","offers":[{"title":"Default Title","offer_id":42282598793393,"sku":"ANT-3.0HA-36PRO","price":325.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0523\/1650\/4241\/files\/antlia-pro-ultra-narrowband-3nm-h-alpha-filter-36mm-unmounted-904839.webp?v=1782294738"},{"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"}],"url":"https:\/\/www.darkclearskies.co.uk\/collections\/antlia-narrowband-filters.oembed","provider":"Dark Clear Skies ","version":"1.0","type":"link"}