{"id":3950,"date":"2025-03-06T20:51:51","date_gmt":"2025-03-06T19:51:51","guid":{"rendered":"https:\/\/deep-space-astronomy.geekworkers.dev\/produit\/filtre-chroma-sii-3nm-optimise-pour-f-d-entre-2-8-et-3-6\/"},"modified":"2025-06-03T10:41:19","modified_gmt":"2025-06-03T08:41:19","slug":"filtre-chroma-sii-3nm-optimise-pour-f-d-entre-2-8-et-3-6","status":"publish","type":"product","link":"https:\/\/deep-space-astronomy.ch\/en\/product\/filtre-chroma-sii-3nm-optimise-pour-f-d-entre-2-8-et-3-6\/","title":{"rendered":"Chroma SII 3nm filter ( 2.8 &lt; f\/d &lt; 3.6) - 2&quot; Mounted"},"content":{"rendered":"<h3>Chroma SII 3nm filter<\/h3>\n<p>Visit <strong>Chroma SII 3nm filter<\/strong>specially optimized for high-speed optical systems with focal ratios between f\/2.8 and f\/3.6, is designed for narrow-band astronomical imaging. It isolates the ionized sulfur emission line (SII) at 671.6 nm and 673.1 nm, essential for revealing details in planetary nebulae, emission nebulae and supernova remnants.<\/p>\n<h4>Key features<\/h4>\n<ul>\n<li><strong>Ultra-narrow bandwidth of 3 nm<\/strong>Allows precise isolation of the SII line while effectively blocking unwanted wavelengths, such as those from light pollution or natural night emissions.<\/li>\n<li><strong>Optimized for high-speed systems (f\/2.8 to f\/3.6)<\/strong>Designed to compensate for the blueshift that occurs with low-focal-ratio telescopes.<\/li>\n<li><strong>Exceptional transmission<\/strong>Transmission of up to 90 % at the center wavelength, offering an excellent signal-to-noise ratio.<\/li>\n<li><strong>Robust construction<\/strong>Multilayer sputter coatings for exceptional durability and long-term spectral stability.<\/li>\n<li><strong>High-quality optical glass substrate<\/strong>Surface accuracy of \u03bb\/4, reducing optical aberrations.<\/li>\n<\/ul>\n<h4>Applications<\/h4>\n<ul>\n<li><strong>Imaging nebulae rich in ionized sulfur<\/strong>Ideal for capturing the complex structures of planetary nebulae and HII regions.<\/li>\n<li><strong>Reducing light pollution<\/strong>Blocks wavelengths from sodium and mercury lamps, as well as atmospheric luminescence.<\/li>\n<li><strong>Advanced astrophotography with high-speed systems<\/strong>Compatible with modern CCD and CMOS cameras, optimizing performance on fast telescopes such as HyperStar or RASA systems.<\/li>\n<\/ul>\n<h4>Technical advantages<\/h4>\n<ul>\n<li><strong>Universal compatibility<\/strong>Available in mounted (1.25\", 2\") and unmounted (36 mm, 50 mm) formats, to suit a wide range of filter wheels and optical configurations.<\/li>\n<li><strong>Anti-glare design<\/strong>Anti-reflective coatings on both sides to eliminate halos around bright stars.<\/li>\n<li><strong>Guaranteed spectral accuracy<\/strong>: Each filter is individually tested to ensure performance to exacting specifications.<\/li>\n<\/ul>\n<h4>Conclusion<\/h4>\n<p>Visit <strong>Chroma SII 3nm filter<\/strong> optimized for f\/2.8 to f\/3.6 is an essential tool for astrophotographers using fast optical systems. Its ultra-narrow bandwidth, exceptional transmission and blueshift optimization guarantee images rich in detail and unrivalled contrast, even under polluted skies.<\/p>","protected":false},"excerpt":{"rendered":"<p>Filtre Chroma SII 3nm Le filtre Chroma SII 3nm, sp\u00e9cialement optimis\u00e9 pour les syst\u00e8mes optiques rapides avec des rapports focaux entre f\/2.8 et f\/3.6, est con\u00e7u pour l\u2019imagerie astronomique \u00e0 bande \u00e9troite. Il isole la raie d\u2019\u00e9mission du soufre ionis\u00e9 (SII) \u00e0 671,6 nm et 673,1 nm, essentielle pour r\u00e9v\u00e9ler des d\u00e9tails dans les n\u00e9buleuses [&hellip;]<\/p>\n","protected":false},"featured_media":3861,"comment_status":"open","ping_status":"closed","template":"","meta":[],"product_brand":[582],"product_cat":[780],"product_tag":[],"class_list":["post-3950","product","type-product","status-publish","has-post-thumbnail","product_brand-chroma","product_cat-filtres-bande-etroite","first","on_supplier","taxable","shipping-taxable","purchasable","product-type-simple"],"_links":{"self":[{"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/product\/3950","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=3950"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/media\/3861"}],"wp:attachment":[{"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/media?parent=3950"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/product_brand?post=3950"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/product_cat?post=3950"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/product_tag?post=3950"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}