{"product_id":"antlia-sho-7nm-prime-filter-set","title":"Antlia SHO 7nm Prime Filter Set","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eComplete SHO narrowband filter set with a 7nm bandpass\u003c\/li\u003e\n\u003cli\u003ePeak transmission greater than 90% for maximum signal\u003c\/li\u003e\n\u003cli\u003eOut-of-band blocking of OD4 (0.01%) minimizes interference from other wavelengths\u003c\/li\u003e\n\u003cli\u003eUsable with systems as fast as f\/2 with minimal loss of signal\u003c\/li\u003e\n\u003cli\u003eLambda\/4 or better transmitted wavefront and \u0026lt;30 arcsec parallelism\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 SHO 7nm Prime Filter Set - 36mm Unmounted\u003c\/h2\u003e\n\u003cp\u003eThe Antlia SHO 7nm Prime Filter Set delivers the core specifications for modern narrowband imaging, combining a tight 7nm bandpass with greater than 90% peak transmission to isolate key emission lines. With out-of-band blocking rated at OD4 (0.01%) and use with nearly all systems as fast as f\/2 with minimal loss in emission signal, this 36mm unmounted set is for narrowband imaging in light-polluted areas and at dark sites.\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\u003e7nm Bandpass with \u0026gt;90% Transmission for High-Contrast Images\u003c\/h3\u003e\n\u003cp\u003eEach filter in the Antlia 7nm Prime set targets a specific emission band: H-alpha (CWL 656.3nm), SII (CWL 672.4nm) and OIII (CWL 500.7nm). The \u0026gt;90% peak transmission captures the faint light from nebulae efficiently, while the OD4 blocking at 300-1000nm minimizes interference from other wavelengths, which Antlia says delivers superior SNR and better contrast.\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\u003eSignal Integrity Down to f\/2 for Modern Telescopes\u003c\/h3\u003e\n\u003cp\u003eAntlia states that, with their wider FWHM, 7nm Prime filters can be used with nearly all systems as fast as f\/2 with minimal loss in emission signal, which meets the requirements of fast optics.\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\u003eLambda\/4 Single-Substrate Design with Blackened Edges\u003c\/h3\u003e\n\u003cp\u003eAntlia builds the 7nm Prime filters on a single, non-glued optical substrate, to eliminate internal reflections, and a steep spectral profile minimizes halos around bright stars. The transmitted wavefront is Lambda\/4 or better with parallelism under 30 arcseconds. The edges of each 2mm thick filter are blackened to eliminate internal reflections from stray light.\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\u003eStrategic Bandpass: Capturing H-alpha, NII, and Dual SII Lines\u003c\/h3\u003e\n\u003cp\u003eThe 7nm bandpass is deliberately chosen to capture more than just the primary emission line. The H-alpha filter's width is sufficient to include the adjacent Nitrogen-II (NII) lines at 654.8nm and 658.3nm, adding signal from H-alpha and NII emission nebulae such as the Orion Nebula (M42). The SII filter is centered to transmit both Sulphur-II emission lines (671.6nm and 673.1nm) for your Hubble Palette (SHO) compositions.\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\"\u003eWhy choose the Antlia 7nm Prime filter set over a 3nm or 5nm set?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eA 7nm bandpass offers a balance between light pollution rejection and signal strength, especially for faster optical systems. While tighter filters (3nm) provide more contrast in heavily light-polluted areas, the \u003cstrong\u003eAntlia 7nm Prime filters\u003c\/strong\u003e allow more signal through, which is beneficial for faster f\/ratio scopes down to f\/2 and can result in shorter exposure times.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the Antlia 7nm Prime SHO set perform with a fast f\/2 telescope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAntlia states that, with their wider FWHM, 7nm Prime filters can be used with nearly all systems as fast as \u003cstrong\u003ef\/2\u003c\/strong\u003e with minimal loss in emission signal.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill I see halos around bright stars with the Antlia 7nm Prime filters?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAntlia has engineered these filters to minimize halos. Key features that contribute to this are:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSingle Substrate:\u003c\/strong\u003e A single, non-glued substrate eliminates internal reflections.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSteep Spectral Profile:\u003c\/strong\u003e The steep spectral profile minimizes halos around bright stars.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEdge Blackening:\u003c\/strong\u003e The unmounted filters are edge blackened to eliminate internal reflections from stray light.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the Antlia 7nm Prime filters for visual observing?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo. Antlia lists night visual observation as not recommended for these filters. They are designed for narrowband astrophotography.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the benefit of the Antlia H-alpha filter also passing NII emission lines?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eMany emission nebulae, such as the Orion Nebula (M42) and the Lagoon Nebula (M8), emit strongly in both H-alpha (hydrogen) and NII (nitrogen). With its \u003cstrong\u003e7nm bandpass\u003c\/strong\u003e, the H-alpha filter passes the H-alpha line at 656.3nm and the NII lines at 654.8nm and 658.3nm, so it records the combined signal.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow will this Antlia 7nm SHO set help me image the Pillars of Creation in the Eagle Nebula (M16) from my suburban backyard?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Eagle Nebula (M16) is a classic SHO target, rich in ionized Sulphur, Hydrogen, and Oxygen. From a suburban location, the \u003cstrong\u003eAntlia 7nm Prime filters\u003c\/strong\u003e can be used in light-polluted areas, as Antlia states. The \u0026gt;OD4 blocking and 7nm bandpass minimize interference from wavelengths outside each passband, which helps separate the structure of the nebula from a bright sky background for a Hubble Palette image.\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\u003eSHO narrowband set (7nm Prime series), 3 filters\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAvailable Sizes\u003c\/td\u003e\n\u003ctd\u003e36mm Round Unmounted\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eH-alpha Filter\u003c\/td\u003e\n\u003ctd\u003eCWL 656.3nm, FWHM 7nm (passes NII 654.8nm \u0026amp; 658.3nm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSII Filter\u003c\/td\u003e\n\u003ctd\u003eCWL 672.4nm, FWHM 7nm (passes SII 671.6nm \u0026amp; 673.1nm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOIII Filter\u003c\/td\u003e\n\u003ctd\u003eCWL 500.7nm, FWHM 7nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePeak Transmission\u003c\/td\u003e\n\u003ctd\u003e\u0026gt;90%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBlocking\u003c\/td\u003e\n\u003ctd\u003e\u0026gt;OD4 (0.01%) @ 300-1000nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRecommended F-Ratio\u003c\/td\u003e\n\u003ctd\u003eUsable with systems as fast as f\/2 with minimal loss of signal\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Thickness\u003c\/td\u003e\n\u003ctd\u003e2mm +\/-0.05mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSubstrate\u003c\/td\u003e\n\u003ctd\u003eOptical, single \/ non-glued\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTransmitted Wavefront\u003c\/td\u003e\n\u003ctd\u003eLambda\/4 or better\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eParallelism\u003c\/td\u003e\n\u003ctd\u003eLess than 30 arcsec\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSurface Quality\u003c\/td\u003e\n\u003ctd\u003e60\/40 (scratch\/dig) per MIL-O-13830\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEdge Treatment\u003c\/td\u003e\n\u003ctd\u003eEdge blackened\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNot Recommended For\u003c\/td\u003e\n\u003ctd\u003eSolar imaging, night visual observation\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWarranty\u003c\/td\u003e\n\u003ctd\u003e3-years against delamination\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 7nm Prime Filter Set (H-alpha, SII, OIII)\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1 (3 filters, individually packaged)\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n3-Year Warranty Against Delamination\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Antlia","offers":[{"title":"36mm Round Unmounted","offer_id":51932624716061,"sku":"ANT-SHO-7NM-SET-RD36","price":430.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/antlia-src-ooN2nuAcwoAY4oAY_61498fca-5137-4a6f-87bc-4c82ac116a05.jpg?v=1792549997","url":"https:\/\/davidastro.com\/fr-us\/products\/antlia-sho-7nm-prime-filter-set","provider":"David Astro","version":"1.0","type":"link"}