{"product_id":"optolong-filtro-l-ultimate-2","title":"Optolong L-Ultimate 2\" Dual Narrowband Filter","description":"\u003ch2\u003eOptolong L-Ultimate 2” – 3nm Dual Narrowband Filter for Astrophotography\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eOptolong L-Ultimate 2”\u003c\/strong\u003e is a \u003cstrong\u003e3nm dual narrowband filter\u003c\/strong\u003e, the evolution of the well-known L-eXtreme. It precisely isolates the emission lines \u003cstrong\u003eH-Alpha (656nm)\u003c\/strong\u003e and \u003cstrong\u003eOIII (500nm)\u003c\/strong\u003e with peak transmission up to \u003cstrong\u003e93%\u003c\/strong\u003e and maximum light pollution suppression.\u003c\/p\u003e\n\u003cp\u003eThe 3nm bandwidth makes the L-Ultimate ideal for astrophotographers in \u003cstrong\u003eurban and suburban areas\u003c\/strong\u003e using \u003cstrong\u003ecolor CMOS cameras\u003c\/strong\u003e – enabling sessions even under full moon and Bortle 7–9 skies without a complex mono setup.\u003c\/p\u003e\n\u003ch3\u003eKey Advantages\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003e3nm bandwidth\u003c\/strong\u003e: maximum suppression of artificial light sources\u003c\/li\u003e\n\u003cli\u003ePeak transmission up to \u003cstrong\u003e93%\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003eWorks under \u003cstrong\u003efull moon\u003c\/strong\u003e and heavily polluted skies\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eOne-filter solution\u003c\/strong\u003e for color CMOS cameras\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 Narrowband (H-Alpha + OIII)\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003ctd\u003e\u003cstrong\u003eBandwidth\u003c\/strong\u003e\u003c\/td\u003e\u003ctd\u003e3nm\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003ctd\u003e\u003cstrong\u003ePeak transmission\u003c\/strong\u003e\u003c\/td\u003e\u003ctd\u003eUp to 93%\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 glass\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\u003eParallelism\u003c\/strong\u003e\u003c\/td\u003e\u003ctd\u003e\u0026lt;30\u0026quot;\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\u003eRecommended camera\u003c\/strong\u003e\u003c\/td\u003e\u003ctd\u003eColor CMOS\u003c\/td\u003e\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e","brand":"Optolong","offers":[{"title":"Default Title","offer_id":51261150888267,"sku":"OPL-ULTIMATE-2","price":369.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0886\/1981\/1147\/files\/optolong-filtro-l-ultimate-astrofotografia-urbana.jpg?v=1744224529","url":"https:\/\/adriasky.it\/en\/products\/optolong-l-ultimate-2-narrowband-filter","provider":"Adriasky","version":"1.0","type":"link"}