{"product_id":"player-one-sii-7nm-narrowband-filter-s-series","title":"Player One SII 7nm Narrowband Filter S-series","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eSulfur-II (SII) Narrowband Filter\u003c\/li\u003e\n\u003cli\u003e7nm Narrowband Passband\u003c\/li\u003e\n\u003cli\u003eAvailable in 1.25\" and 2\" Mounted Formats\u003c\/li\u003e\n\u003cli\u003eOptimized for High-Contrast Astrophotography\u003c\/li\u003e\n\u003cli\u003eAdvanced Anti-Reflection and Halo Control Coatings\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\u003eDownloads\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\u003ePlayer One SII 7nm Narrowband Filter S-series\u003c\/h2\u003e\n\u003cp\u003eThe Player One S-Series SII filter isolates the Sulfur-II (SII) emission line with a tight 7nm bandpass for high-contrast narrowband astrophotography. Available in 1.25\" and 2\" mounted formats, it uses high-quality optical glass and multi-layer coatings to isolate this nebular emission line, dramatically increasing detail and contrast, especially from light-polluted locations.\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\u003eIsolating Emission Lines with a 7nm Bandpass\u003c\/h3\u003e\n\u003cp\u003eThe 7nm bandpass of this filter is the key to its function, transmitting a very narrow slice of the light spectrum while blocking out broadband light pollution from city skies, natural skyglow, and moonlight. This creates a near-black background, causing faint structures in emission nebulae like the Veil Nebula (NGC 6960) to stand out with striking clarity. A 7nm width offers a practical balance, providing excellent contrast without requiring the extremely long exposure times of tighter 3nm or 5nm filters.\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\u003eCreating Hubble Palette Images with 3 Filters\u003c\/h3\u003e\n\u003cp\u003eCombined with the matching Ha and OIII 7nm filters (sold separately), this SII filter completes the three filters required to produce images in the iconic Hubble Palette. By capturing separate data for Sulfur-II, Hydrogen-alpha, and Oxygen-III, you can assign each signal to the Red, Green, and Blue channels of a color image, respectively. This technique reveals detailed structural and compositional differences within nebulae, creating vibrant, scientific, and aesthetically compelling portraits of objects like the Eagle Nebula (M16) and its Pillars of Creation.\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\u003eS-Series Construction: Advanced Halo Control in 1.25\" and 2\" Formats\u003c\/h3\u003e\n\u003cp\u003ePlayer One's S-Series filters are built on a high-quality optical glass substrate and utilize multi-layer composite coatings to ensure excellent optical transmission at the target wavelength. A primary focus of the design is superior halo control, which minimizes the distracting rings of light that can form around bright stars in long exposures. This meticulous coating process results in cleaner data with sharper stars and preserves the faint nebular details surrounding them.\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\"\u003eWhat is the main advantage of the Player One S-Series 7nm SII filter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe primary advantage is its ability to dramatically increase the contrast of emission nebulae by isolating the Sulfur-II (SII) wavelength. The \u003cstrong\u003e7nm bandpass\u003c\/strong\u003e is aggressive enough to block most forms of light pollution, allowing you to capture deep-sky objects from suburban or even urban locations.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I use the SII filter with Ha and OIII filters to create a color image?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYou capture a series of monochrome images through each of the three filters (SII, Ha, and OIII) separately. In post-processing software, you combine them into a single color image. The most common mapping is the \"Hubble Palette\":\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eRed Channel:\u003c\/strong\u003e Sulfur-II (SII) data\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGreen Channel:\u003c\/strong\u003e Hydrogen-alpha (Ha) data\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBlue Channel:\u003c\/strong\u003e Oxygen-III (OIII) data\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThis assignment creates the classic gold-and-blue look associated with Hubble Space Telescope images.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the 7nm SII filter suitable for my fast f\/4 Newtonian telescope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, the 7nm bandpass is generally suitable for telescopes with focal ratios of f\/4 and slower. Very fast systems (f\/2.8 or faster) can sometimes experience a phenomenon called \"band-shift\" with narrowband filters, but a 7nm design is more forgiving than ultra-narrow 3nm filters. The 1.25\" version is ideal for most dedicated astronomy cameras that have smaller sensors, while the 2\" version suits larger sensors.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhich size should I choose for my camera: 1.25\" or 2\"?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003e1.25\" filters are too small for full-frame sensors and will cause severe vignetting (darkening of the corners); they are designed for cameras with smaller sensors, such as APS-C, Four Thirds, or smaller dedicated planetary\/guide cameras. The 2\" version, with standard M48x0.75 threads, prevents vignetting with larger camera sensors or focal reducers and ensures the entire light cone illuminates your sensor.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow will the Player One SII filter perform on the North America Nebula (NGC 7000)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe North America Nebula is an extremely large object rich in Hydrogen-alpha. The \u003cstrong\u003eSII filter\u003c\/strong\u003e will pick up trace amounts of sulfur. Combined with \u003cstrong\u003eHa filter\u003c\/strong\u003e data revealing the intricate structures of the \"Cygnus Wall\" and \u003cstrong\u003eOIII filter\u003c\/strong\u003e data isolating the shockfront regions where stellar winds are exciting oxygen, it allows you to create a full Hubble Palette image with rich color variation across the nebula.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the Player One 7nm SII filter for viewing 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 This is a nighttime narrowband filter and lacks the necessary energy rejection components for solar observation. Attempting to view the Sun through a narrowband filter will cause permanent eye damage and destroy your camera sensor. Safe solar observation requires a dedicated, full-aperture solar filter or a specialized solar telescope.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ch3\u003e1.25\"\u003c\/h3\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Type\u003c\/td\u003e\n\u003ctd\u003eNarrowband Interference Filter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEmission Line\u003c\/td\u003e\n\u003ctd\u003eSulfur-II (SII)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBandpass\u003c\/td\u003e\n\u003ctd\u003e7nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSize\u003c\/td\u003e\n\u003ctd\u003e1.25\" (Mounted)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeries\u003c\/td\u003e\n\u003ctd\u003ePlayer One S-Series\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003e2\"\u003c\/h3\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Type\u003c\/td\u003e\n\u003ctd\u003eNarrowband SII Filter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeries\u003c\/td\u003e\n\u003ctd\u003eS-Series\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBandpass\u003c\/td\u003e\n\u003ctd\u003e7nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSize\u003c\/td\u003e\n\u003ctd\u003e2\" (Mounted)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eThreads\u003c\/td\u003e\n\u003ctd\u003eM48x0.75\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eThis product consists of the SII 7nm filter in the selected size only. Protective cases and other accessories are not specified by the manufacturer.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Player_One_2026_Product_Catalog_Manual.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Manual\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003ca title=\"Player One 2-Year Warranty\" href=\"https:\/\/davidastro.com\/pages\/player-one-warranty-policy\" target=\"_blank\"\u003ePlayer One 2-Year Warranty\u003c\/a\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Player One","offers":[{"title":"1.25\"","offer_id":52913426989341,"sku":"POA-SII7-125","price":181.0,"currency_code":"CAD","in_stock":true},{"title":"2\"","offer_id":52913427022109,"sku":"POA-SII7-2","price":349.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/PlayerOne-Ha-SII-OIII-7nm-narrowband-1-25-Filter-S-series-1-SII7-125_8a98b9af-3a8e-4c13-add3-9b64be7c7f81.jpg?v=1789090943","url":"https:\/\/davidastro.com\/fr\/products\/player-one-sii-7nm-narrowband-filter-s-series","provider":"David Astro","version":"1.0","type":"link"}