{"id":3837,"date":"2025-03-06T20:36:07","date_gmt":"2025-03-06T19:36:07","guid":{"rendered":"https:\/\/deep-space-astronomy.geekworkers.dev\/produit\/filtre-h%ce%b1-7nm-pegasus\/"},"modified":"2025-06-03T10:40:49","modified_gmt":"2025-06-03T08:40:49","slug":"filtre-h%ce%b1-7nm-pegasus","status":"publish","type":"product","link":"https:\/\/deep-space-astronomy.ch\/en\/product\/filtre-h%ce%b1-7nm-pegasus\/","title":{"rendered":"H\u03b1 7nm Pegasus filter - 2\u2033 mounted"},"content":{"rendered":"<h2>Pegasus Astro H-alpha (H\u03b1) filter<\/h2>\n<p>The filter <strong>Pegasus Astro H-alpha (H\u03b1)<\/strong> is a high-quality narrow-band filter designed for astrophotography. Here are its detailed features:<\/p>\n<h3>Technical specifications<\/h3>\n<ul>\n<li><strong>Diameter :<\/strong> 50.8 mm (2 inches)<\/li>\n<li><strong>Thread :<\/strong> M48 x 0.75 mm<\/li>\n<li><strong>Total thickness :<\/strong> 7.5 mm (5 mm filter body + 2.5 mm thread)<\/li>\n<li><strong>Bandwidth :<\/strong> 7 nm<\/li>\n<li><strong>Central wavelength :<\/strong> 656 nm<\/li>\n<li><strong>Transmission :<\/strong> Tave &gt; 80% at 656 nm<\/li>\n<li><strong>Polishing :<\/strong> 1\/4 wavelength<\/li>\n<li><strong>Coating :<\/strong> Anti-reflective multilayer<\/li>\n<li><strong>Type :<\/strong> Narrow-band interference filter<\/li>\n<\/ul>\n<h3>Features and benefits<\/h3>\n<ul>\n<li><strong>Optimum transmission :<\/strong> The filter offers transmission greater than 80% at the central wavelength of 656 nm, corresponding to the hydrogen alpha emission line.<\/li>\n<li><strong>Narrow bandwidth :<\/strong> With a bandwidth of just 7 nm, this filter effectively isolates the H\u03b1 emission line, enabling excellent separation of spectral details.<\/li>\n<li><strong>Parafocality:<\/strong> Like all Pegasus Astro filters, the H\u03b1 filter is parafocal with the other filters in the series, simplifying the image acquisition process.<\/li>\n<li><strong>Superior optical quality :<\/strong> The 1\/4-wavelength polish guarantees excellent image quality and optimum sharpness.<\/li>\n<li><strong>Anti-reflective coating :<\/strong> Multi-layer anti-reflective coating eliminates halos, ghosting and unwanted reflections.<\/li>\n<li><strong>Durability:<\/strong> The filter is designed to withstand scratches and temperature changes.<\/li>\n<li><strong>UV and IR blocking :<\/strong> The filter effectively blocks UV and IR wavelengths, improving image sharpness and reducing halos.<\/li>\n<\/ul>\n<h3>Astrophotography applications<\/h3>\n<ul>\n<li><strong>Imaging emission nebulae :<\/strong> Ideal for capturing the details of nebulae rich in ionized hydrogen.<\/li>\n<li><strong>Reducing light pollution :<\/strong> Narrow bandwidth enables effective imaging even in areas of high light pollution.<\/li>\n<li><strong>False color imaging :<\/strong> Used in the Hubble palette technique (SHO) to create spectacular false-color images.<\/li>\n<li><strong>High-resolution imaging :<\/strong> The narrow bandwidth enables high-contrast images to be obtained, revealing fine details in nebular structures.<\/li>\n<\/ul>\n<h3>Conclusion<\/h3>\n<p>In conclusion, the filter <strong>H\u03b1 Pegasus Astro<\/strong> is a high-quality tool for specialized astrophotography, offering excellent transmission in a narrow band centered on the hydrogen alpha emission line.<\/p>","protected":false},"excerpt":{"rendered":"<p>Filtre Pegasus Astro H-alpha (H\u03b1) Le filtre Pegasus Astro H-alpha (H\u03b1) est un filtre \u00e0 bande \u00e9troite de haute qualit\u00e9 con\u00e7u pour l&rsquo;astrophotographie. Voici ses caract\u00e9ristiques d\u00e9taill\u00e9es : Sp\u00e9cifications techniques Diam\u00e8tre : 50,8 mm (2 pouces) Filetage : M48 x 0,75 mm \u00c9paisseur totale : 7,5 mm (5 mm pour le corps du filtre + [&hellip;]<\/p>\n","protected":false},"featured_media":3835,"comment_status":"open","ping_status":"closed","template":"","meta":[],"product_brand":[517],"product_cat":[780],"product_tag":[],"class_list":{"0":"post-3837","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_brand-pegasus","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\/3837","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=3837"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/media\/3835"}],"wp:attachment":[{"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/media?parent=3837"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/product_brand?post=3837"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/product_cat?post=3837"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/product_tag?post=3837"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}