{"id":3944,"date":"2025-03-06T20:50:57","date_gmt":"2025-03-06T19:50:57","guid":{"rendered":"https:\/\/deep-space-astronomy.geekworkers.dev\/produit\/filtre-chroma-h-alpha-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-h-alpha-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-h-alpha-3nm-optimise-pour-f-d-entre-2-8-et-3-6\/","title":{"rendered":"Chroma H-alpha filter 3nm ( 2.8 &lt; f\/d &lt; 3.6) - 2&quot; Mounted"},"content":{"rendered":"<h3>Chroma H-Alpha 3nm filter<\/h3>\n<p>Visit <strong>Chroma H-Alpha 3nm filter<\/strong> optimized for fast focal ratios between f\/2.8 and f\/3.6, is specially designed for narrow-band astronomical imaging. This high-precision filter captures the emission line of ionized hydrogen at 656.3 nm, a wavelength crucial for revealing the details of hydrogen-rich nebulae.<\/p>\n<h4>Key features<\/h4>\n<ul>\n<li><strong>Ultra-narrow bandwidth of 3 nm<\/strong>H-alpha: effectively isolates the H-alpha line while blocking unwanted wavelengths such as light pollution and natural night emissions.<\/li>\n<li><strong>Ideal for capturing fine details<\/strong>Perfect for celestial objects such as the Orion Nebula, the Rosetta Nebula or the Swan Complex.<\/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 high-speed optical systems.<\/li>\n<li><strong>Exceptional transmission<\/strong>Transmittance of up to 99 % at the center wavelength, guaranteeing optimum light collection while maximizing contrast.<\/li>\n<li><strong>Sustainable construction<\/strong>Multilayer sputter coatings for enhanced resistance to temperature and humidity variations. Unique high-quality glass substrate, eliminating the need for lamination and improving spectral stability.<\/li>\n<\/ul>\n<h4>Applications<\/h4>\n<ul>\n<li><strong>Imaging hydrogen-rich nebulae<\/strong>Detailed capture of complex structures in HII regions. Ideal for narrow-band astrophotography projects, including SHO palettes (Hubble).<\/li>\n<li><strong>Reducing light pollution<\/strong>: Effectively blocks unwanted wavelengths (sodium lamps, mercury or lunar emissions), even under polluted skies.<\/li>\n<li><strong>Use with modern CCD\/CMOS cameras<\/strong>Compatible with high-resolution sensors and fast optical systems to maximize deep-sky performance.<\/li>\n<\/ul>\n<h4>Technical advantages<\/h4>\n<ul>\n<li><strong>Universal compatibility<\/strong>: Works with most filter wheels and drawers available on the market.<\/li>\n<li><strong>Available in mounted (1.25\u201d, 2\u201d) and unmounted formats<\/strong>: To adapt to specific needs.<\/li>\n<li><strong>Anti-glare design<\/strong>Anti-reflective coatings on the rear surface to eliminate halos or ghosting around bright stars.<\/li>\n<li><strong>Specially designed for high-speed systems<\/strong>Maintains optimum spectral precision despite the blueshift inherent in high-speed optics.<\/li>\n<\/ul>\n<h4>Conclusion<\/h4>\n<p>Visit <strong>Chroma H-Alpha 3nm filter<\/strong> optimized for f\/2.8 to f\/3.6 is an indispensable tool for astrophotographers using fast optical systems. Its ultra-narrow bandwidth, exceptional transmission and robust design guarantee images rich in detail and unrivalled contrast, even under polluted skies.<\/p>","protected":false},"excerpt":{"rendered":"<p>Filtre Chroma H-Alpha 3nm Le filtre Chroma H-Alpha 3nm optimis\u00e9 pour des rapports focaux rapides entre f\/2.8 et f\/3.6 est sp\u00e9cialement con\u00e7u pour l\u2019imagerie astronomique \u00e0 bande \u00e9troite. Ce filtre de haute pr\u00e9cision permet de capturer la raie d\u2019\u00e9mission de l\u2019hydrog\u00e8ne ionis\u00e9 \u00e0 656,3 nm, une longueur d\u2019onde cruciale pour r\u00e9v\u00e9ler les d\u00e9tails des n\u00e9buleuses [&hellip;]<\/p>\n","protected":false},"featured_media":3920,"comment_status":"open","ping_status":"closed","template":"","meta":[],"product_brand":[582],"product_cat":[780],"product_tag":[],"class_list":["post-3944","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\/3944","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=3944"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/media\/3920"}],"wp:attachment":[{"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/media?parent=3944"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/product_brand?post=3944"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/product_cat?post=3944"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/product_tag?post=3944"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}