{"product_id":"antlia-sho-3nm-narrowband-pro-filters-sho-pro","title":"Antlia SHO 3nm Narrowband PRO Filters","description":"\u003ch1 data-mce-fragment=\"1\"\u003eAntlia SHO 3nm Narrowband Pro Filters\u003c\/h1\u003e\n\u003cp data-mce-fragment=\"1\"\u003eAntlia SHO Pro narrowband filter optimizes the FWHM (full width half maximum) to 3nm bandpass. As the bandwidth becomes narrower, the 3nm Pro narrowband filters enhance contrast of emission targets by lowering the unwanted background signal. Antlia SHO 3nm Pro filters are designed to deliver 88% transmission which provides you with the maximum signal and well defined nebulae structures.\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\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, which means that the 3nm Pro narrowband filter can guarantee high transmittance for working with both long focal ratios and fast optical systems. Blue-shift 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 and meets the requirements of fast optics like Hyperstar and RASA.\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eThe out of band blocking specification is rated OD5 (0.001%) which delivers an excellent SNR (signal to noise ratio) and effective cut-off rate to minimize interference from other wavelengths. Improved sharp cut-off astrophotography 3nm Pro filters are designed to minimize halos around bright stars.\u003c\/p\u003e\n\u003ch4 data-mce-fragment=\"1\"\u003eApplication and Performance:\u003c\/h4\u003e\n\u003cp data-mce-fragment=\"1\"\u003eHigh transmittance and smallest bandwidth to maximize contrast\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eSteep spectral profile minimizes halos around bright stars\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eA single substrate to eliminate internal reflections\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eNarrowband Objects: H-alpha Emission Nebulae, H-alpha Emission Nebulae, SII Emission Nebulae, Planetary, Wolf Rayet Nebulae and Supernova Remnants\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eUse in light polluted areas and dark sites\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eExtends imaging time when the moon is up\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eAntlia narrowband Pro filters can be used down to F\/3 systems with slight loss of signal\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eAll Antlia Narrowband filters are edge blackened to eliminate internal reflections from stray light\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eSuperior optical reliability reduces post image processing\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eThis filter is not suited to deep sky objects that do not contain H-alpha emissions.\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"color: #ff2a00;\"\u003eNot Recommended:\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"color: #ff2a00;\"\u003eSolar Observing and imaging\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"color: #ff2a00;\"\u003eVisual observation\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"color: #ff2a00;\"\u003eDO NOT LOOK AT THE SUN WITH ANTLIA FILTERS.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"color: #ff2a00;\"\u003eSerious eye damage will result if you fail to observe the warning.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003eWhen we design filters for astronomy imaging systems, we look at how they will work together with optical systems, carefully designing the blocking and band-pass parameters to achieve an optimum result. The out of band blocking rate is a very important performance index since it is designed to sharply attenuate off-band wavelengths. The result is that the Antlia SII 3nm Pro filter delivers excellent contrast with extremely dark backgrounds whilst delivering a high transmission of the SII signal. Such filters are more difficult to produce to a consistently high standard.\u003c\/p\u003e\n\u003cp\u003eEach filter is individually tested and scanned to ensure that the quality meets the high-performance parameters. The end result is a filter that achieves excellent contrast but with a higher production cost. We believe the price to performance ratio compares more favorably than similar premium filters in the market.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ch4\u003e\u003cem\u003eSII Specifications:\u003c\/em\u003e\u003c\/h4\u003e\n\u003cp\u003e\u003cstrong\u003eBasic Substrate:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eSchott optical substrate\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFilter Thickness：\u003c\/strong\u003e2mm+\/-0.05mm\/ (3mm+\/-0.05mm for Dia50mm unmounted)\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFWHM (Full width at half maximum):\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003e3nm\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCWL (Central Wavelength)\u003c\/strong\u003e: 671.6nm\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePeak Transmission:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e＞88%\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eBlocking:\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003e\u0026gt; 5 OD(0.001% out of band blocking) @ 300-1000nm\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSurface Quality:\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003eS\/D (scratch\/dig)= 60\/40 (Refer to MIL-O-13830)\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTransmitted Wavefront:\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003eLambda\/4 or better.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eParallelism:\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003eless than 30 arcsec\u003c\/p\u003e\n\u003cp\u003eSingle \/ Non-glued substrate\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch4\u003e\u003cem\u003eH-Alpha Specifications:\u003c\/em\u003e\u003c\/h4\u003e\n\u003cp\u003e\u003cstrong\u003eBasic Substrate:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eSchott optical substrate\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFilter Thickness:   \u003c\/strong\u003e2mm+\/-0.05mm \/ (3mm+\/-0.05mm for Dia50mm unmounted)\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFWHM (Full width at half maximum):\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003e3nm\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCWL (Central Wavelength)\u003c\/strong\u003e: 656.3nmnm\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePeak Transmission:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e＞88%\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eBlocking:\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003e\u0026gt; 5 OD(0.001% out of band blocking) @ 300-1000nm\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSurface Quality:\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003eS\/D (scratch\/dig)= 60\/40 (Refer to MIL-O-13830)\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTransmitted Wavefront:\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003eLambda\/4 or better.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eParallelism:\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003eless than 30 arcsec\u003c\/p\u003e\n\u003cp\u003eSingle \/ Non-glued substrate\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch4\u003e\u003cem\u003eOIII Specifications:\u003c\/em\u003e\u003c\/h4\u003e\n\u003cp\u003e\u003cstrong\u003eBasic Substrate:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eoptical substrate\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFilter Thickness:   \u003c\/strong\u003e2mm+\/-0.05mm \/ (3mm+\/-0.05mm for Dia50mm unmounted)\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFWHM (Full width at half maximum):\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003e3nm\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCWL (Central Wavelength)\u003c\/strong\u003e: 500.7nm\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePeak Transmission:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e＞85%\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eBlocking:\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003e\u0026gt; 5 OD(0.001% out of band blocking) @ 300-1000nm\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSurface Quality:\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003eS\/D (scratch\/dig)= 60\/40 (Refer to MIL-O-13830)\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTransmitted Wavefront:\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003eLambda\/4 or better.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eParallelism:\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003eless than 30 arcsec\u003c\/p\u003e\n\u003cp\u003eSingle \/ Non-glued substrate\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003eIn the Box\u003c\/h3\u003e\n\u003cp\u003eSelected Filters\u003cbr\u003e\u003c\/p\u003e\n\u003cdiv data-mce-fragment=\"1\" class=\"value\"\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003eWarranty \u0026amp; Manuals\u003c\/h3\u003e\n\u003cp data-mce-fragment=\"1\"\u003eAntlia 3-Years Warranty against Delamination\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Antlia","offers":[{"title":"1.25\" Round Mounted \/ SHO Filter Set","offer_id":43780850188517,"sku":"AF-SHO-PRO-1.25","price":1086.0,"currency_code":"CAD","in_stock":true},{"title":"1.25\" Round Mounted \/ H-Alpha","offer_id":43780852515045,"sku":"AF-HA-PRO-1.25","price":362.0,"currency_code":"CAD","in_stock":true},{"title":"1.25\" Round Mounted \/ Oxygen III","offer_id":43780852547813,"sku":"AF-OIII-PRO-1.25","price":362.0,"currency_code":"CAD","in_stock":true},{"title":"1.25\" Round Mounted \/ Sulfur II","offer_id":43780852580581,"sku":"AF-SII-PRO-1.25","price":362.0,"currency_code":"CAD","in_stock":true},{"title":"31mm Round Unmounted \/ SHO Filter Set","offer_id":43780850221285,"sku":"AF-SHO-PRO-31","price":1170.0,"currency_code":"CAD","in_stock":true},{"title":"31mm Round Unmounted \/ H-Alpha","offer_id":43780852613349,"sku":"AF-HA-PRO-31","price":390.0,"currency_code":"CAD","in_stock":true},{"title":"31mm Round Unmounted \/ Oxygen III","offer_id":43780852646117,"sku":"AF-OIII-PRO-31","price":390.0,"currency_code":"CAD","in_stock":true},{"title":"31mm Round Unmounted \/ Sulfur II","offer_id":43780852678885,"sku":"AF-SII-PRO-31","price":390.0,"currency_code":"CAD","in_stock":true},{"title":"36mm Round Unmounted \/ SHO Filter Set","offer_id":43780850254053,"sku":"AF-SHO-PRO-36","price":1320.0,"currency_code":"CAD","in_stock":true},{"title":"36mm Round Unmounted \/ H-Alpha","offer_id":43780852711653,"sku":"AF-HA-PRO-36","price":440.0,"currency_code":"CAD","in_stock":true},{"title":"36mm Round Unmounted \/ Oxygen III","offer_id":43780852744421,"sku":"AF-OIII-PRO-36","price":440.0,"currency_code":"CAD","in_stock":true},{"title":"36mm Round Unmounted \/ Sulfur II","offer_id":43780852777189,"sku":"AF-SII-PRO-36","price":440.0,"currency_code":"CAD","in_stock":true},{"title":"2\" Round Mounted \/ SHO Filter Set","offer_id":43780850286821,"sku":"AF-SHO-PRO-2","price":1683.0,"currency_code":"CAD","in_stock":true},{"title":"2\" Round Mounted \/ H-Alpha","offer_id":43780852809957,"sku":"AF-HA-PRO-2","price":561.0,"currency_code":"CAD","in_stock":true},{"title":"2\" Round Mounted \/ Oxygen III","offer_id":43780852842725,"sku":"AF-OIII-PRO-2","price":561.0,"currency_code":"CAD","in_stock":true},{"title":"2\" Round Mounted \/ Sulfur II","offer_id":43780852875493,"sku":"AF-SII-PRO-2","price":561.0,"currency_code":"CAD","in_stock":true},{"title":"50mm Round Unmounted \/ SHO Filter Set","offer_id":43780850319589,"sku":"AF-SHO-PRO-50R","price":2088.0,"currency_code":"CAD","in_stock":true},{"title":"50mm Round Unmounted \/ H-Alpha","offer_id":43780852908261,"sku":"AF-HA-PRO-50R","price":696.0,"currency_code":"CAD","in_stock":true},{"title":"50mm Round Unmounted \/ Oxygen III","offer_id":43780852941029,"sku":"AF-OIII-PRO-50R","price":696.0,"currency_code":"CAD","in_stock":true},{"title":"50mm Round Unmounted \/ Sulfur II","offer_id":43780852973797,"sku":"AF-SII-PRO-50R","price":696.0,"currency_code":"CAD","in_stock":true},{"title":"50mm Square Unmounted \/ SHO Filter Set","offer_id":43780850352357,"sku":"AF-SHO-PRO-50S","price":3195.0,"currency_code":"CAD","in_stock":true},{"title":"50mm Square Unmounted \/ H-Alpha","offer_id":43780853006565,"sku":"AF-HA-PRO-50S","price":1065.0,"currency_code":"CAD","in_stock":true},{"title":"50mm Square Unmounted \/ Oxygen III","offer_id":43780853039333,"sku":"AF-OIII-PRO-50S","price":1065.0,"currency_code":"CAD","in_stock":true},{"title":"50mm Square Unmounted \/ Sulfur II","offer_id":43780853072101,"sku":"AF-SII-PRO-50S","price":1065.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/antlia-sho-3nm-narrowband-pro-filters-astronomy-plus-1_9e92846b-a4db-4fb9-8abb-50827bd23729.jpg?v=1690488413","url":"https:\/\/istronomyplus.com\/products\/antlia-sho-3nm-narrowband-pro-filters-sho-pro","provider":"Astronomy Plus – Telescopes \u0026 Astrophotography Canada","version":"1.0","type":"link"}