{"product_id":"optolong-filtro-l-para-2","title":"Optolong L-Para 2\" Dual Band Filter","description":"\u003ch2\u003eOptolong L-Para 2” – 10nm Dual Band Filter for Deep Sky Astrophotography\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eOptolong L-Para 2”\u003c\/strong\u003e is a \u003cstrong\u003e10nm dual band filter\u003c\/strong\u003e for astrophotography of emission nebulae under \u003cstrong\u003elight pollution\u003c\/strong\u003e. Its two transmission windows centered on \u003cstrong\u003eH-Alpha (656nm)\u003c\/strong\u003e and \u003cstrong\u003eOIII (500nm)\u003c\/strong\u003e selectively isolate nebula light while blocking artificial sources (Na 589nm, Hg 435\/578nm) and atmospheric skyglow.\u003c\/p\u003e\n\u003cp\u003eThe 10nm bandwidth offers greater brightness and shorter exposure times compared to ultra-narrowband filters – ideal for \u003cstrong\u003ecolor CMOS\u003c\/strong\u003e and \u003cstrong\u003eCCD cameras\u003c\/strong\u003e under suburban skies.\u003c\/p\u003e\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003e10nm bandwidth\u003c\/strong\u003e on H-Alpha and OIII\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eSchott monolithic substrate\u003c\/strong\u003e, non-cemented\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eMulti-coated ion-assisted\u003c\/strong\u003e for scratch resistance\u003c\/li\u003e\n\u003cli\u003eCompatible with standard 2” focusers\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\u003eDual Band (H-Alpha + OIII)\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003ctd\u003e\u003cstrong\u003eBandwidth\u003c\/strong\u003e\u003c\/td\u003e\u003ctd\u003e10nm (Ha 656nm + OIII 500nm)\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003ctd\u003e\u003cstrong\u003eFormat\u003c\/strong\u003e\u003c\/td\u003e\u003ctd\u003e2” (50.8mm)\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003ctd\u003e\u003cstrong\u003eSubstrate\u003c\/strong\u003e\u003c\/td\u003e\u003ctd\u003eSchott monolithic, non-cemented\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003ctd\u003e\u003cstrong\u003eThickness\u003c\/strong\u003e\u003c\/td\u003e\u003ctd\u003e2.0mm\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\u003eWavefront flatness\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\u003e\u0026lt;30\u0026quot;\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003ctd\u003e\u003cstrong\u003eCoating\u003c\/strong\u003e\u003c\/td\u003e\u003ctd\u003eMulti-coated, ion-assisted evaporation\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003ctd\u003e\u003cstrong\u003eRecommended cameras\u003c\/strong\u003e\u003c\/td\u003e\u003ctd\u003eColor CMOS, Color CCD, DSLR\u003c\/td\u003e\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e","brand":"Optolong","offers":[{"title":"Default Title","offer_id":51260688105803,"sku":"OPL-PARA-2","price":239.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0886\/1981\/1147\/files\/4a19a398e18691c98feb2888ab552f7e.png?v=1756461658","url":"https:\/\/adriasky.it\/en\/products\/optolong-l-para-2-dual-band-filter","provider":"Adriasky","version":"1.0","type":"link"}