{"product_id":"optolong-l-ultimate-dual-band-3nm-filter-2-l-ultimate","title":"Optolong L-Ultimate Dual-Band 3nm Filter","description":"\u003ch1\u003eOptolong L-Ultimate Filter\u003c\/h1\u003e\n\u003cp\u003eIt’s about a 3nm dual band designed to drastically reduce the effect of light pollution, the 3nm isolates the nebulae’s emissions into H-Alpha (red) and OIII (green-blue). It blocks light pollution, maximizes the signal from nebulae, and darkens the sky background. It also blocks artificial light from mercury vapor lamps, high and low pressure sodium vapor lights, and unwanted natural light caused by the emission of neutral oxygen in our atmosphere. …\u003c\/p\u003e\n\u003ch4\u003e\u003cstrong\u003eOpotlong L-Ultimate Introduction\u003c\/strong\u003e\u003c\/h4\u003e\n\u003cp\u003eIt’s about a 3nm dual band designed to drastically reduce the effect of light pollution, the 3nm isolates the nebulae’s emissions into H-Alpha (red) and OIII (green-blue). It blocks light pollution, maximizes the signal from nebulae, and darkens the sky background. It also blocks artificial light from mercury vapor lamps, high and low pressure sodium vapor lights, and unwanted natural light caused by the emission of neutral oxygen in our atmosphere. Maximizes the transmission of the main emission lines of the nebula in OIII (496nm and 500nm) and H-alpha (656nm). Used with DSLR, color\/MONO CMOS and CCD, however, this filter is not suitable for fast ratio systems.\u003c\/p\u003e\n\u003cp\u003eThe advantage of L-Ultimate is that it only passes through the emission lines OIII(500.7nm) and Ha(656.3nm), in which case all other light pollution emission lines are eliminated so that only the emission and reflection signals of the nebula are captured during imaging. Therefore, the sky background of the image is darker, and the contrast between the nebulae and the signal-to-noise ratio are improved to the greatest extent. In heavy light pollution areas, the product can also selectively filter light pollution and clutter signals through the emission lines of nebulae, and finally avoid the impact of light pollution on astrophotography.\u003c\/p\u003e\n\u003cp\u003eIt is different from the series of dual-narrowband L-eNhance and L-eXtreme in that L-Ultimate is a dual-3nm bandwidth filter that only passes through Ha and OIII emission lines. You will get a darker sky background, more contrast of the image and the suppression on stars. L-Ultimate has also been optimized in terms of halo performance, so that there is no obvious halo when shooting on a bright star object.\u003c\/p\u003e\n\u003ch4\u003eFeatures\u003c\/h4\u003e\n\u003ctable align=\"center\" cellpadding=\"1\" cellspacing=\"2\" border=\"1\" class=\"alignleft\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSbustrate\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eoptical glass\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFWHM\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eOIII 3nm Ha 3nm\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBlocking range\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003e300-1000nm\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBlocking\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003e\u0026gt;OD4\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSurface quality\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003e60\/40\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eTransmitted Wavefront RMS:\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eλ\/4\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eParallelism\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003e30seconds\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch4\u003e\u003cstrong\u003eL-Ultimate Filter Performance\u003c\/strong\u003e\u003c\/h4\u003e\n\u003cp\u003e\u003cu\u003e\u003cstrong\u003eNebulae Flying Bat and Squid in the constellation of Cepheus.\u003c\/strong\u003e\u003c\/u\u003e\u003cbr\u003eSquid (OU4) is a region characterized by very weak OIII emission with a bipolar shape reminiscent of planetary nebulae. Recent studies suggest that Ou4 is actually internal to SH2-129 (the H-alpha-emitting flying bat nebula, reddish in the image), generated by a triple star system located in the center (HR8119, visible as the bright star in the center of Squid).\u003cbr\u003eThe distance from our solar system is estimated at about 1300 light years.\u003cbr\u003eThe lights were taken over 2 years, with total integration equal to 29 hours (21.5 for OU4 and 7.5 for SH2-129).\u003cbr\u003eThis project gave me the opportunity to test the Omegon veTEC 571C camera and the Optolong L-Ultimate filter with excellent results for both products.\u003c\/p\u003e\n\u003cp\u003eLights: 258x300s (Ou4, L-Extreme) + 30x900s (Sh2-129, L-Ultimate)\u003c\/p\u003e\n\u003cp\u003eTelescope1: Apocromatic TS PhotoLine 102 f\/5,6 Triplet FPL53\u003cbr\u003eTelescope2: Takahashi FS60CB @ f\/4.2\u003cbr\u003eCamera1: ZWO ASI 294mc Pro\u003cbr\u003eCamera2: Omegon veTEC 571C\u003cbr\u003eMount: Skywatcher AZ-EQ6 GT\u003cbr\u003eFilters: Optolong Astronomy Filter L-Extreme + L-Ultimate\u003cbr\u003eProcessing: DeepSkyStacker, Photoshop CC, PixInsight\u003cbr\u003eCredit:Tommaso Massimo Stella (Italy)\u003c\/p\u003e\n\u003cp\u003e\u003cimg class=\"lazyloaded\" src=\"https:\/\/optolong.com\/uploads\/images\/20220813\/8e82dcbd4356c2b25658ae4d38898da9.jpg\" alt=\"\" width=\"529\" height=\"361\" data-ll-status=\"loaded\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cu\u003e\u003cstrong\u003eObjects: Veil Nebula\u003c\/strong\u003e\u003c\/u\u003e\u003cbr\u003eCamera: QHY168C\u003cbr\u003eTelescope: Pentax 100 SDUF II F\/4\u003cbr\u003eMount: Skywatcher AZ-EQ5GT\u003cbr\u003eFilter: Optolong 3nm L-Ultimate Filter\u003cbr\u003eFrames: 13 x 240sec lights\u003cbr\u003eCredit:Tommy Lim KW (Malaysia)\u003c\/p\u003e\n\u003cp\u003e\u003cimg class=\"lazyloaded\" src=\"https:\/\/optolong.com\/uploads\/images\/20220813\/0a012c0ef16bddfb90595bf2502e3c51.jpg\" alt=\"\" width=\"531\" height=\"353\" data-ll-status=\"loaded\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cu\u003e\u003cstrong\u003eSh2-132 The Lion nebula\u003c\/strong\u003e\u003c\/u\u003e\u003cbr\u003eProsegue il test del filtro  Ultimate della Optolong Astronomy Filter\u003cbr\u003e96 light da 300 sec\u003cbr\u003eNo dark no flat\u003cbr\u003eCredit:Andrea Maggi\u003c\/p\u003e\n\u003cp\u003e\u003cimg class=\"lazyloaded\" src=\"https:\/\/optolong.com\/uploads\/images\/20220813\/31ceb16a19983c46396af72fe7ba3cc1.jpg\" alt=\"\" width=\"500\" height=\"335\" data-ll-status=\"loaded\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cu\u003e\u003cstrong\u003eSupernova remnant W63\u003c\/strong\u003e\u003c\/u\u003e\u003c\/p\u003e\n\u003cp\u003eSupernova remnant W63 glows like a faint cosmic smoke ring along the plane of the Milky Way toward the northern constellation Cygnus. Its spectral appearance is reflected in the region’s rich complex of interstellar clouds and dust by an eerie blue glow, captured with Optolong’s new dual band 3nn filter!! L-Ultimate…\u003c\/p\u003e\n\u003cp\u003eCanon Eos MK IV mod by CentralDS 20×900″ ISO3200\u003cbr\u003eOptolong L-Ultimate\u003cbr\u003eSkywatcher AZ-GTI mount\u003cbr\u003eGuide camera ZWO ASI 120MM\u003cbr\u003eCredit:José Jiménez (Spain)\u003c\/p\u003e\n\u003cp\u003e\u003cimg class=\"lazyloaded\" src=\"https:\/\/optolong.com\/uploads\/images\/20220813\/4672efc207e69c658cf26c68e7bea6a4.jpg\" alt=\"\" width=\"504\" height=\"338\" data-ll-status=\"loaded\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cu\u003e\u003cstrong\u003eSharpless 129\u003c\/strong\u003e\u003c\/u\u003e\u003cbr\u003eCanon Eos MK IV mod by CentralDS 30×900″ ISO3200\u003cbr\u003eOptolong L-Ultimate\u003cbr\u003eCredit:José Jiménez (Spain)\u003c\/p\u003e\n\u003cp\u003e\u003cimg class=\"lazyloaded\" src=\"https:\/\/optolong.com\/uploads\/images\/20220813\/f94ddb185f8fe14b6659bda59bfa14f0.jpg\" alt=\"\" width=\"515\" height=\"338\" data-ll-status=\"loaded\"\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cu\u003e\u003cstrong\u003eNGC6888 HOO Version\u003c\/strong\u003e\u003c\/u\u003e\u003cbr\u003eTelescope ASKAR 500\u003cbr\u003eCamera Zwo ASI 6200\u003cbr\u003eFilter Optolong 3nm\u003cbr\u003eSoftware Voyager\u003cbr\u003eCredit:Andrea Maggi (Italy)\u003c\/p\u003e\n\u003cp\u003e\u003cimg class=\"lazyloading\" src=\"https:\/\/optolong.com\/uploads\/images\/20220813\/1d8c80c3e194a0161f9b4569df88ff1f.jpg\" alt=\"\" width=\"486\" height=\"324\" data-lazy-src=\"https:\/\/optolong.com\/uploads\/images\/20220813\/1d8c80c3e194a0161f9b4569df88ff1f.jpg\" data-ll-status=\"loading\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cu\u003e\u003cstrong\u003eNGC7635 \u0026amp; Sh2-157\u003c\/strong\u003e\u003c\/u\u003e\u003cbr\u003eDue ore stanotte da Saint Barthelemy\u003cbr\u003eTelescopio Askar 80 PH\u003cbr\u003eCamera Asi 2600\u003cbr\u003eFiltro Optolong Ultimate\u003cbr\u003eCredit:Andrea Maggi (Italy)\u003c\/p\u003e\n\u003cp\u003e\u003cimg class=\"lazyloading\" src=\"https:\/\/optolong.com\/uploads\/images\/20220813\/a637b149e53e64b7d6e98dbf75f1c346.jpg\" alt=\"\" width=\"504\" height=\"337\" data-lazy-src=\"https:\/\/optolong.com\/uploads\/images\/20220813\/a637b149e53e64b7d6e98dbf75f1c346.jpg\" data-ll-status=\"loading\"\u003e\u003c\/p\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cem\u003eReference Spectrum\u003c\/em\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg data-ll-status=\"loaded\" height=\"279\" width=\"569\" alt=\"\" src=\"https:\/\/optolong.com\/uploads\/images\/20220813\/affa162a0200e85a43f613d6409654fc.png\" class=\"lazyloaded\"\u003e\u003c\/p\u003e\n\u003cp\u003e※This curve is only for reference, and is not used as the final product data.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow to read the chart?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e▲The horizontal axis is the Wavelength in Nanometers(nm).\u003c\/p\u003e\n\u003cp\u003e▲The vertical axis is transmission in %.\u003cimg data-ll-status=\"loaded\" height=\"80\" width=\"486\" alt=\"\" src=\"http:\/\/www.optolong.com\/uploads\/images\/20191111\/0ff2d7f395c427aa390ff53daf333cec.jpg\" class=\"aligncenter lazyloaded\"\u003e\u003c\/p\u003e\n\u003ctable class=\"alignleft\" border=\"1\" cellspacing=\"2\" cellpadding=\"1\" align=\"center\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSbustrate\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eoptical glass\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFWHM\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eOIII 3nm Ha 3nm\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBlocking range\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003e300-1000nm\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBlocking\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003e\u0026gt;OD4\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSurface quality\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003e60\/40\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eTransmitted Wavefront RMS:\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eλ\/4\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eParallelism\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003e30seconds\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cem\u003e\u003cstrong\u003eCoating Technology\u003c\/strong\u003e\u003c\/em\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e·Multi-layers anti-reflection coating\u003c\/p\u003e\n\u003cp\u003e·Non-cementing optical substrate coating\u003c\/p\u003e\n\u003cp\u003e·Optolong filter adopts precision coating based on Ion-assisted deposition coating technology for durability and resistance to scratching, as well as stability on CWL(central wavelength) no deviation affected by temperature change.\u003c\/p\u003e\n\u003cp\u003e·Planetary rotation system offers precision and homogeneity of coatings ensuring high value on transmission of pass-band and Optical density of off-band.\u003c\/p\u003e\n\u003ch3\u003eIn the Box\u003c\/h3\u003e\n\u003cp\u003eFilter\u003c\/p\u003e\n\u003ch3\u003eManuals \u0026amp; Warranty\u003cbr\u003e\n\u003c\/h3\u003e\n\u003cp\u003eOptolong 3-Years Warranty\u003c\/p\u003e","brand":"Optolong","offers":[{"title":"1.25\"","offer_id":44430953251045,"sku":"OL-L-ULTIMATE-125","price":403.0,"currency_code":"CAD","in_stock":true},{"title":"2\"","offer_id":44430953283813,"sku":"OL-L-ULTIMATE-2","price":543.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/optolong-l-ultimate-dual-band-3nm-filter-2-l-ultimate-astronomy-plus-1.webp?v=1690488488","url":"https:\/\/istronomyplus.com\/products\/optolong-l-ultimate-dual-band-3nm-filter-2-l-ultimate","provider":"Astronomy Plus – Telescopes \u0026 Astrophotography Canada","version":"1.0","type":"link"}