{"product_id":"optolong-l2-dual-combo-set-l-extreme-l-synergy-2","title":"Optolong L2 Dual-Combo Set (L-eXtreme\u0026L-Synergy) (2\")","description":"\u003ch1\u003eOptolong L2 Dual-Combo Set (L-eXtreme\u0026amp;L-Synergy)\u003c\/h1\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-size: 14px;\"\u003e\u003cspan style=\"font-family: Arial,Helvetica,sans-serif;\"\u003eL2 Dual-Combo Set includes two premium filters: one L-eXtreme and one L-Synergy.\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-size: 14px;\"\u003e\u003cspan style=\"font-family: Arial,Helvetica,sans-serif;\"\u003eL-eXtreme:The L-eXtreme is a dual-narrowband filter (OIII-7nm \u0026amp; Ha-7nm) designed to exclusively transmit the key nebula emission lines of OIII (500.7nm) and Hα (656.3nm). By effectively blocking all other light pollution emission lines, it ensures that only the signals from OIII and Hα elements are captured during imaging, achieving maximum effective transmission. With years of technological refinement, it significantly optimizes the performance in suppressing bright star halos.\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-size: 14px;\"\u003e\u003cspan style=\"font-family: Arial,Helvetica,sans-serif;\"\u003eL-Synergy：The L-Synergy is a dual-narrowband filter (OIII-7nm \u0026amp; SII-7nm) that guarantees high transmission for both the SII (672.4nm) and OIII (500.7nm) spectral lines, while offering exceptional out-of-band rejection for all other wavelengths. By effectively blocking all other light pollution emission lines, it ensures that only the signals from OIII and SII elements are captured during imaging, achieving maximum effective transmission. With years of technological refinement, it significantly optimizes the performance in suppressing bright star halos.\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-size: 20px;\"\u003e\u003cspan style=\"font-family: Arial,Helvetica,sans-serif;\"\u003e\u003cstrong\u003e1.  Why is L2 Dual-Combo Set?\u003c\/strong\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-size: 14px;\"\u003e\u003cspan style=\"font-family: Arial,Helvetica,sans-serif;\"\u003eThe L2 Dual-Combo Set is engineered to unleash the power of Hubble Palette imaging for color camera users, supporting telescope systems as fast as F3.3, and above ( slower system).\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-size: 14px;\"\u003e\u003cspan style=\"font-family: Arial,Helvetica,sans-serif;\"\u003eTailored specifically for color camera astrophotographers, this set includes two premium filters: OIII \u0026amp; Hα (L-eXtreme),OIII \u0026amp; SII (L-Synergy).\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-size: 14px;\"\u003e\u003cspan style=\"font-family: Arial,Helvetica,sans-serif;\"\u003eThis innovative combination breaks through the traditional limitations of narrowband imaging with color cameras. Without the need to switch to a monochrome camera or invest in an expensive SHO three-filter set, users can achieve stunning Hubble Palette images at a fraction of the cost and complexity.\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-size: 14px;\"\u003e\u003cspan style=\"font-family: Arial,Helvetica,sans-serif;\"\u003eThe core appeal of this combination design lies in lowering barriers and expanding possibilities for colour camera users: it preserves the equipment advantages of colour cameras while enabling users to unlock “Hubble-like” creative capabilities at minimal cost through minimalist filter combination. Simultaneously, it offers greater flexibility for astrophotography.\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-size: 14px;\"\u003e\u003cspan style=\"font-family: Arial,Helvetica,sans-serif;\"\u003eWhether capturing nebular detail or reproducing deep-sky colours, this combination enables richer creative expression, truly unlocking the full potential of colour cameras in deep-sky photography.\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-size: 20px;\"\u003e\u003cspan style=\"font-family: Arial,Helvetica,sans-serif;\"\u003e\u003cstrong\u003e2.Optical Design\u003c\/strong\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-size: 14px;\"\u003e\u003cspan style=\"font-family: Arial,Helvetica,sans-serif;\"\u003eBased on the characteristics of celestial emission lines and light pollution emission lines, the L2 Dual-Combo Set preserves the distinctive colours of nebulae in OIII, Hα, and SII while filtering out the vast majority of light pollution. Specifically designed and optically optimized, its transmission profile is as follows:\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan style=\"font-size: 14px;\"\u003e\u003cspan style=\"font-family: Arial,Helvetica,sans-serif;\"\u003e\u003cimg style=\"height: 371px; width: 800px;\" src=\"https:\/\/optolong.com\/uploads\/images\/20250924\/19ce3d5664886f96373832d4be8e8830.png\" alt=\"\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3 style=\"text-align: left;\"\u003e\u003cspan style=\"font-size: 14px;\"\u003e\u003cspan style=\"font-family: Arial,Helvetica,sans-serif;\"\u003eTechnical Specifications\u003cbr\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003ctable cellspacing=\"0\" border=\"0\"\u003e\n\u003ccolgroup span=\"2\" width=\"85\"\u003e\u003c\/colgroup\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd height=\"17\" align=\"center\"\u003e\u003cb\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003eParameter\u003c\/span\u003e\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd align=\"center\"\u003e\u003cb\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003eValue\u003c\/span\u003e\u003c\/b\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd height=\"47\" align=\"left\"\u003e\u003cb\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003eProduct Name\u003c\/span\u003e\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd align=\"left\"\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003eOptolong L2 Dual-Combo Set\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd height=\"17\" align=\"left\"\u003e\u003cb\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003eFilter Count\u003c\/span\u003e\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd align=\"left\"\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003e2 filters\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd height=\"32\" align=\"left\"\u003e\u003cb\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003eIncluded Filter 1\u003c\/span\u003e\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd align=\"left\"\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003eL-eXtreme\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd height=\"32\" align=\"left\"\u003e\u003cb\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003eIncluded Filter 2\u003c\/span\u003e\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd align=\"left\"\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003eL-Synergy\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd height=\"32\" align=\"left\"\u003e\u003cb\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003eL-eXtreme Passbands\u003c\/span\u003e\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd align=\"left\"\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003eOIII 500.7 nm, Hα 656.3 nm\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd height=\"32\" align=\"left\"\u003e\u003cb\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003eL-Synergy Passbands\u003c\/span\u003e\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd align=\"left\"\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003eOIII 500.7 nm, SII 672.4 nm\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd height=\"32\" align=\"left\"\u003e\u003cb\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003eBandwidth (FWHM)\u003c\/span\u003e\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd align=\"left\"\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003e7 nm (all passbands)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd height=\"47\" align=\"left\"\u003e\u003cb\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003eSupported Telescope Speed\u003c\/span\u003e\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd align=\"left\"\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003ef\/3.3 and slower\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd height=\"32\" align=\"left\"\u003e\u003cb\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003eCoating Type\u003c\/span\u003e\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd align=\"left\"\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003eMulti-layer anti-reflection\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd height=\"77\" align=\"left\"\u003e\u003cb\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003eSubstrate Coating Type\u003c\/span\u003e\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd align=\"left\"\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003eNon-cementing optical substrate coating\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd height=\"47\" align=\"left\"\u003e\u003cb\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003eCoating Technology\u003c\/span\u003e\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd align=\"left\"\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003eIon-assisted deposition (IAD)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd height=\"62\" align=\"left\"\u003e\u003cb\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003eCWL Stability\u003c\/span\u003e\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd align=\"left\"\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003eNo deviation with temperature change\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd height=\"47\" align=\"left\"\u003e\u003cb\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003eCoating Uniformity Method\u003c\/span\u003e\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd align=\"left\"\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003ePlanetary rotation system\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd height=\"32\" align=\"left\"\u003e\u003cb\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003eThread Specification\u003c\/span\u003e\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd align=\"left\"\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003eM48 × 0.75\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd height=\"17\" align=\"left\"\u003e\u003cb\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003eFilter Size\u003c\/span\u003e\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd align=\"left\"\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003e2\"\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd height=\"32\" align=\"left\"\u003e\u003cb\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003eInner Plastic Box Material\u003c\/span\u003e\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd align=\"left\"\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003ePP\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd height=\"32\" align=\"left\"\u003e\u003cb\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003eLining Material\u003c\/span\u003e\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd align=\"left\"\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003eHigh-pressure black EVA\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3 style=\"text-align: left;\"\u003e\n\u003cspan style=\"font-size: 14px;\"\u003e\u003cspan style=\"font-family: Arial,Helvetica,sans-serif;\"\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/span\u003e\u003cspan style=\"font-size: 14px;\"\u003e\u003cspan style=\"font-family: Arial,Helvetica,sans-serif;\"\u003e\u003c\/span\u003e\u003c\/span\u003e\n\u003c\/h3\u003e\n\u003ch3\u003e\u003cspan style=\"font-size: 14px;\"\u003e\u003cspan style=\"font-family: Arial,Helvetica,sans-serif;\"\u003eIn the Box\u003c\/span\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan style=\"font-size: 14px;\"\u003e\u003cspan style=\"font-family: Arial,Helvetica,sans-serif;\"\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003eOptolong L-eXtreme (2\")\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-size: 14px;\"\u003e\u003cspan style=\"font-family: Arial,Helvetica,sans-serif;\"\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003eOptolong L-Synergy (2\")\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan style=\"font-size: 14px;\"\u003e\u003cspan style=\"font-family: Arial,Helvetica,sans-serif;\"\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003e\u003cbr\u003e\u003cbr\u003eWarranty\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/istronomyplus.com\/pages\/optolong-warranty\" target=\"_blank\" rel=\"noopener\"\u003e\u003cspan style=\"font-size: 14px;\"\u003e\u003cspan style=\"font-family: Arial,Helvetica,sans-serif;\"\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003eOptolong 3-Year Warranty\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/a\u003e\u003c\/p\u003e","brand":"Optolong","offers":[{"title":"Default Title","offer_id":48076794396901,"sku":"OPT-L2-2","price":795.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/625ce0ff357eae9d0cd02396e639a230.jpg?v=1777043812","url":"https:\/\/istronomyplus.com\/products\/optolong-l2-dual-combo-set-l-extreme-l-synergy-2","provider":"Astronomy Plus – Telescopes \u0026 Astrophotography Canada","version":"1.0","type":"link"}