{"product_id":"antlia-filtro-h-alpha-3-5nm-2","title":"Antlia H-Alpha 3.5nm Filter 2\"","description":"\u003ch2\u003eAntlia H-Alpha 3.5nm Filter 2\" – Ultra-Narrow Band for Astrophotography\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eAntlia H-Alpha 3.5nm filter\u003c\/strong\u003e is an \u003cstrong\u003eultra-narrow band filter\u003c\/strong\u003e centered on the ionized hydrogen emission line at \u003cstrong\u003e656.3nm\u003c\/strong\u003e, with a bandwidth of just \u003cstrong\u003e3.5nm\u003c\/strong\u003e. It guarantees transmission above \u003cstrong\u003e88%\u003c\/strong\u003e on the H-Alpha line and out-of-band blocking of OD3 (0.1%) from 300 to 1100nm, for maximum contrast even under heavy light pollution and during moonlit nights.\u003c\/p\u003e\n\u003cp\u003eDesigned specifically for \u003cstrong\u003enew-generation CMOS cameras\u003c\/strong\u003e and fast telescopes down to \u003cstrong\u003ef\/2.0\u003c\/strong\u003e, the filter uses a monolithic, non-glued Schott substrate with double-sided polishing and multi-layer nano-coating. The edge is hand-blackened – a distinctive feature of Antlia's build quality – to completely eliminate stray light and halos around bright stars.\u003c\/p\u003e\n\u003cp\u003eThe H-Alpha component of the \u003cstrong\u003eSHO set\u003c\/strong\u003e (H-Alpha + OIII + SII), it enables high-contrast imaging of emission nebulae, supernova remnants and planetary nebulae, with the option to enrich RGB images with the H-Alpha channel for greater structural definition.\u003c\/p\u003e\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003e3.5nm\u003c\/strong\u003e bandpass – maximum contrast and light pollution suppression\u003c\/li\u003e\n\u003cli\u003eTransmission \u003cstrong\u003e\u0026gt;88%\u003c\/strong\u003e on the H-Alpha line at 656.3nm\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eOD3 (0.1%)\u003c\/strong\u003e blocking from 300 to 1100nm\u003c\/li\u003e\n\u003cli\u003eMonolithic, non-glued Schott substrate, parallel ±0.05mm\u003c\/li\u003e\n\u003cli\u003eHand-blackened edges to eliminate stray light and halos\u003c\/li\u003e\n\u003cli\u003e2\" mount (M48x0.75), compatible down to \u003cstrong\u003ef\/2.0\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\u003ctd\u003e\u003cstrong\u003eFilter type\u003c\/strong\u003e\u003c\/td\u003e\u003ctd\u003eUltra-narrow band H-Alpha\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003ctd\u003e\u003cstrong\u003eCenter wavelength\u003c\/strong\u003e\u003c\/td\u003e\u003ctd\u003e656.3nm\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003ctd\u003e\u003cstrong\u003eBandpass (FWHM)\u003c\/strong\u003e\u003c\/td\u003e\u003ctd\u003e3.5nm\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003ctd\u003e\u003cstrong\u003eH-Alpha transmission\u003c\/strong\u003e\u003c\/td\u003e\u003ctd\u003e\u0026gt;88%\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003ctd\u003e\u003cstrong\u003eOut-of-band blocking\u003c\/strong\u003e\u003c\/td\u003e\u003ctd\u003eOD3 (0.1%) @ 300–1100nm\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003ctd\u003e\u003cstrong\u003eFormat\u003c\/strong\u003e\u003c\/td\u003e\u003ctd\u003e2\" (mounted, M48x0.75)\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003ctd\u003e\u003cstrong\u003eSubstrate\u003c\/strong\u003e\u003c\/td\u003e\u003ctd\u003eSchott, 2mm ±0.05mm thickness\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003ctd\u003e\u003cstrong\u003eSurface quality\u003c\/strong\u003e\u003c\/td\u003e\u003ctd\u003e60\/40 (MIL-O-13830)\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003ctd\u003e\u003cstrong\u003eFlatness\u003c\/strong\u003e\u003c\/td\u003e\u003ctd\u003e1\/4λ\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003ctd\u003e\u003cstrong\u003eParallelism\u003c\/strong\u003e\u003c\/td\u003e\u003ctd\u003e30\"\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003ctd\u003e\u003cstrong\u003eCoating\u003c\/strong\u003e\u003c\/td\u003e\u003ctd\u003eMulti-layer nano-coating, double-sided\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003ctd\u003e\u003cstrong\u003eFocal ratio\u003c\/strong\u003e\u003c\/td\u003e\u003ctd\u003eDown to f\/2.0\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003ctd\u003e\u003cstrong\u003eRecommended use\u003c\/strong\u003e\u003c\/td\u003e\u003ctd\u003eMono CCD\/CMOS, SHO imaging, emission nebulae\u003c\/td\u003e\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e","brand":"Antlia","offers":[{"title":"Default Title","offer_id":58534348063051,"sku":"ANA-HA-2","price":559.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0886\/1981\/1147\/files\/ABUIABACGAAgo7vF8QUowL7lDTCgBjigBg.jpg?v=1789992081","url":"https:\/\/adriasky.it\/en\/products\/antlia-h-alpha-3-5nm-filter-2-in","provider":"Adriasky","version":"1.0","type":"link"}