{"product_id":"antlia-8-el-uhc-pro-visual-enhanced-filter","title":"Antlia 8-EL UHC Pro Visual Enhanced Filter - 2\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eEnhances 8 key nebular emission lines for visual use\u003c\/li\u003e\n\u003cli\u003ePeak transmission of 95% at H-beta, OIII, NII, H-alpha, and SII wavelengths\u003c\/li\u003e\n\u003cli\u003eRecommended for large aperture telescopes (8-inch or larger)\u003c\/li\u003e\n\u003cli\u003eSuppresses sodium light for use in moderate light pollution\u003c\/li\u003e\n\u003cli\u003eStandard 2\" (M48x0.75) threaded, ultra-thin filter cell\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eAntlia 8-EL UHC Pro Visual Enhanced Filter - 2\"\u003c\/h2\u003e\n\u003cp\u003eThe Antlia 8-EL UHC Pro Visual Enhanced Filter is designed for visual observation, with 95% peak transmission at 8 emission lines, including H-beta (486.1nm), OIII (500.7nm), H-alpha (656.3nm) and SII (671.6nm). This 2-inch filter suppresses sodium light and is designed to combat moderate light pollution while maintaining color balance. Antlia recommends large-aperture telescopes of 8 inches or more.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eAn 8-Line Passband Design: 95% Transmission for Key Nebulae Lines\u003c\/h3\u003e\n\u003cp\u003eThis filter's core is a multi-bandpass design that transmits light from 8 specific spectral lines with 95% efficiency. By isolating the distinct wavelengths of doubly ionized oxygen (OIII), hydrogen (H-beta, H-alpha), nitrogen (NII), and sulfur (SII), it helps observers perceive fine structural detail in planetary and emission nebulae, even under moderate light pollution.\u003c\/p\u003e\n\u003cp\u003eAntlia's suggested targets include the Veil Nebula (NGC 6960), the Orion Nebula (M42) and the Horsehead Nebula (IC 434), and Antlia states that the filter lets observers perceive fine structural detail in planetary and emission nebulae even under moderate light pollution.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eRecommended for 8-inch+ Telescopes Under Moderate Light Pollution\u003c\/h3\u003e\n\u003cp\u003eAntlia recommends large-aperture telescopes, for example 8 inches or larger, for the 8-EL UHC Pro. Because the human eye captures fewer photons at night, a large aperture gives sufficient light throughput.\u003c\/p\u003e\n\u003cp\u003eAntlia states that this compensates for the eye's sensitivity drop in low-light conditions while keeping the filter's balance between light pollution suppression and target brightness. Suggested targets include the Ring Nebula (M57) and the Eagle Nebula (M16).\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eBeyond H-beta and OIII: NII, H-alpha and SII Lines\u003c\/h3\u003e\n\u003cp\u003eBesides H-beta and OIII, the Antlia 8-EL passes NII, H-alpha and SII lines, each at 95% peak transmission. Antlia pairs each line with suggested observation targets:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eHydrogen-Alpha (656.3nm):\u003c\/strong\u003e Suggested targets include the North America Nebula (NGC 7000), M8 Lagoon Nebula and M16 Eagle Nebula.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNitrogen II \u0026amp; Sulfur II (654.8nm - 673.1nm):\u003c\/strong\u003e Suggested targets include the Crab Nebula (M1) supernova remnant and the Cat's Eye Nebula (NGC 6543) planetary nebula.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eUltra-Thin, Black Anodized 2\" Filter Cell (M48x0.75)\u003c\/h3\u003e\n\u003cp\u003eThe filter is housed in an ultra-thin, black-anodized cell, designed to minimize vignetting by maximizing the possible clear aperture.\u003c\/p\u003e\n\u003cp\u003eThe filter ring is 2-inch (M48x0.75). The cell is laser engraved, and Antlia states the engraving does not fade.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhich emission lines does the Antlia 8-EL UHC Pro filter pass?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Antlia 8-EL UHC Pro is a multi-band filter with 95% peak transmission at 8 emission lines: \u003cstrong\u003eHydrogen-Beta\u003c\/strong\u003e (486.1nm), \u003cstrong\u003eOxygen-III\u003c\/strong\u003e (495.9nm and 500.7nm), \u003cstrong\u003eNitrogen-II\u003c\/strong\u003e (654.8nm and 658.3nm), \u003cstrong\u003eHydrogen-Alpha\u003c\/strong\u003e (656.3nm) and \u003cstrong\u003eSulfur-II\u003c\/strong\u003e (671.6nm and 673.1nm). It also suppresses sodium light.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy is the Antlia 8-EL filter recommended for telescopes 8 inches or larger?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAntlia's reason is that the human eye captures fewer photons at night. Telescopes with \u003cstrong\u003e8 inches of aperture or more\u003c\/strong\u003e give sufficient light throughput, compensating for the eye's sensitivity drop in low-light conditions while keeping the filter's balance between light pollution suppression and target brightness.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Antlia 8-EL UHC Pro suited to the Veil Nebula (NGC 6960)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. Antlia lists the Veil Nebula among the suggested targets for its OIII, NII, H-alpha and SII lines. The Veil is a supernova remnant, and Antlia states that the filter's high transmission and sodium-light suppression let observers perceive fine structural detail in emission nebulae even under moderate light pollution, with a telescope of 8 inches or larger recommended.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the Antlia 8-EL filter on the Horsehead Nebula (IC 434)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAntlia lists the Horsehead Nebula (IC 434) among the suggested targets for its H-alpha (656.3nm) and SII (671.6nm) lines. It is a difficult visual target, because it is a dark nebula silhouetted against a faint emission nebula, so results depend on your aperture and sky. Antlia recommends a telescope of 8 inches or larger and designed the filter for moderate light pollution.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Antlia 8-EL UHC Pro filter suitable for astrophotography?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAntlia designed this filter for \u003cstrong\u003evisual observation\u003c\/strong\u003e of celestial objects and gives no imaging specifications for it. It is not recommended for solar imaging.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the Antlia 8-EL filter for looking at the Sun?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003e\u003cstrong\u003eABSOLUTELY NOT.\u003c\/strong\u003e Antlia's warning: DO NOT LOOK AT THE SUN WITH THIS FILTER DIRECTLY. Serious eye damage will result if you fail to observe the warning. The filter is also not recommended for solar imaging.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Type\u003c\/td\u003e\n\u003ctd\u003eMulti-band visual enhancer (8 emission lines)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAvailable Sizes\u003c\/td\u003e\n\u003ctd\u003e2\" Mounted\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Threads\u003c\/td\u003e\n\u003ctd\u003eM48x0.75\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePeak Transmission\u003c\/td\u003e\n\u003ctd\u003e95% at H-beta (486.1nm), OIII (495.9nm, 500.7nm), NII (654.8nm, 658.3nm), H-alpha (656.3nm), and SII (671.6nm, 673.1nm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLight Pollution Suppression\u003c\/td\u003e\n\u003ctd\u003eFor moderate light pollution (suppresses sodium light)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRecommended Telescope Aperture\u003c\/td\u003e\n\u003ctd\u003e8-inch (203mm) or larger\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCell Construction\u003c\/td\u003e\n\u003ctd\u003eUltra-thin to minimize vignetting, black anodized, laser engraved\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSolar Safety\u003c\/td\u003e\n\u003ctd\u003eNot recommended for solar imaging; do not look at the Sun with this filter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eAntlia 8-EL UHC Pro Visual Enhanced Filter - 2\"\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\nAntlia 3-Year Warranty Against Delamination\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Antlia","offers":[{"title":"2\" Mounted","offer_id":51932625830173,"sku":"ANT-8-EL-UHC-2","price":167.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/image_7357b329-5b38-423f-ba9b-300b4479374e.jpg?v=1783705352","url":"https:\/\/davidastro.com\/fr\/products\/antlia-8-el-uhc-pro-visual-enhanced-filter","provider":"David Astro","version":"1.0","type":"link"}