{"id":3907,"date":"2025-03-06T20:44:34","date_gmt":"2025-03-06T19:44:34","guid":{"rendered":"https:\/\/deep-space-astronomy.geekworkers.dev\/produit\/filtre-chroma-sii-8nm\/"},"modified":"2025-06-03T10:40:56","modified_gmt":"2025-06-03T08:40:56","slug":"filtre-chroma-sii-8nm","status":"publish","type":"product","link":"https:\/\/deep-space-astronomy.ch\/en\/product\/filtre-chroma-sii-8nm\/","title":{"rendered":"Chroma SII filter 8nm - 2\u2033 mounted"},"content":{"rendered":"<h3>8nm SII filter from Chroma Technology<\/h3>\n<p>Visit <strong>8nm SII filter from Chroma Technology<\/strong> is a narrow-band filter designed to isolate the ionized sulfur emission line (SII) at 672 nm. It is ideal for imaging sulfur-rich nebulae, capturing spectacular detail in deep-sky objects while reducing light interference.<\/p>\n<h4>Key features<\/h4>\n<ul>\n<li><strong>Bandwidth :<\/strong> 8 nm, providing effective isolation of the SII line while blocking unwanted wavelengths, such as those from light pollution or sodium and mercury lamps.<\/li>\n<li><strong>High transmission :<\/strong> Up to 94 % at 672 nm, guaranteeing an excellent signal-to-noise ratio for capturing the subtle details of nebulae.<\/li>\n<li><strong>Targeted emission rays :<\/strong> SII doublet at 671.6 nm and 673.1 nm, characteristic of sulfur-rich regions.<\/li>\n<li><strong>Optical quality :<\/strong> Surface polished to an accuracy of \u03bb\/4.<\/li>\n<li><strong>Multi-layer anti-reflective coatings :<\/strong> To minimize halos and stray reflections.<\/li>\n<li><strong>Available formats :<\/strong>\n<ul>\n<li>Mounted: 1.25\", 2\".<\/li>\n<li>Unmounted: Customized formats (31 mm, 36 mm).<\/li>\n<\/ul>\n<\/li>\n<li><strong>Substrate thickness :<\/strong> Approx. 3 mm, guaranteeing exceptional durability.<\/li>\n<\/ul>\n<h4>Applications<\/h4>\n<ul>\n<li><strong>Imaging SII-rich nebulae:<\/strong>\n<ul>\n<li>Ideal for capturing objects such as the Crab Nebula, Rosette Nebula and Veil Nebula.<\/li>\n<\/ul>\n<\/li>\n<li><strong>Reducing light pollution :<\/strong>\n<ul>\n<li>Effectively blocks unwanted wavelengths, even in urban environments or under polluted skies.<\/li>\n<\/ul>\n<\/li>\n<li><strong>Advanced astrophotography :<\/strong>\n<ul>\n<li>The perfect complement to H-alpha and OIII filters for scientific palette images (SHO or Hubble palette).<\/li>\n<\/ul>\n<\/li>\n<li><strong>Compatibility with high-speed systems :<\/strong>\n<ul>\n<li>Works perfectly with focal ratios up to f\/4.0.<\/li>\n<li>Can be used successfully on very fast systems (f\/2.8 to f\/3.6), although an optimized version is recommended to compensate for blueshift.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h4>Technical highlights<\/h4>\n<ul>\n<li><strong>Exceptional durability :<\/strong>\n<ul>\n<li>Sputter coatings guarantee long-term spectral stability.<\/li>\n<li>Resistant to extreme variations in temperature and humidity.<\/li>\n<\/ul>\n<\/li>\n<li><strong>Anti-halos design :<\/strong> Anti-reflective coatings eliminate halos around bright stars, delivering sharp, detailed images.<\/li>\n<li><strong>Universal compatibility :<\/strong> Compatible with most filter wheels and drawers on the market.<\/li>\n<\/ul>\n<h4>Conclusion<\/h4>\n<p>The filter <strong>Chroma SII 8nm<\/strong> is an essential tool for deep-sky imaging. Its bandwidth is slightly wider than that of ultra-narrow filters (3 or 5 nm), enabling it to capture more signal while offering excellent contrast. It is an essential choice for astrophotographers wishing to reveal the subtle details of nebulae rich in ionized sulfur (SII).<\/p>","protected":false},"excerpt":{"rendered":"<p>Filtre SII 8nm de Chroma Technology Le filtre SII 8nm de Chroma Technology est un filtre \u00e0 bande \u00e9troite con\u00e7u pour isoler la raie d\u2019\u00e9mission du soufre ionis\u00e9 (SII) \u00e0 672 nm. Il est id\u00e9al pour l\u2019imagerie des n\u00e9buleuses riches en soufre, permettant de capturer des d\u00e9tails spectaculaires dans les objets du ciel profond tout [&hellip;]<\/p>\n","protected":false},"featured_media":3905,"comment_status":"open","ping_status":"closed","template":"","meta":[],"product_brand":[582],"product_cat":[780],"product_tag":[],"class_list":{"0":"post-3907","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_brand-chroma","7":"product_cat-filtres-bande-etroite","9":"first","10":"on_supplier","11":"taxable","12":"shipping-taxable","13":"purchasable","14":"product-type-simple"},"_links":{"self":[{"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/product\/3907","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/comments?post=3907"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/media\/3905"}],"wp:attachment":[{"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/media?parent=3907"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/product_brand?post=3907"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/product_cat?post=3907"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/product_tag?post=3907"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}