{"id":1282,"date":"2024-12-18T16:37:41","date_gmt":"2024-12-18T15:37:41","guid":{"rendered":"https:\/\/deep-space-astronomy.geekworkers.dev\/?post_type=product&#038;p=1282"},"modified":"2025-06-03T10:36:15","modified_gmt":"2025-06-03T08:36:15","slug":"reducteur-0-7x-fra600","status":"publish","type":"product","link":"https:\/\/deep-space-astronomy.ch\/en\/product\/reducteur-0-7x-fra600\/","title":{"rendered":"Gearbox 0.7x FRA600"},"content":{"rendered":"<h3>Askar F3.9 0.7x Full-Frame gearbox for FRA400 - Specifications and features<\/h3>\n<p>The Askar F3.9 0.7x reducer is designed to optimize the performance of the FRA400 astrograph, reducing its original 400mm focal length while lowering the focal ratio for shorter exposures and a wider field of view. This model is perfectly compatible with full-frame sensors, enabling extended image coverage without vignetting and meeting the requirements of most deep-sky astrophotographers.<\/p>\n<h3>Askar F3.9 0.7x gearbox specifications<\/h3>\n<ul>\n<li><strong>Focal ratio reduction :<\/strong> The 0.7x reduction factor reduces the focal ratio from f\/5.6 to f\/3.9, increasing brightness and speed for capturing celestial objects with shorter exposures.<\/li>\n<li><strong>Reduced focal length :<\/strong> The focal length is shortened to 280 mm, ideal for fast capture and a wide field of view, especially for diffuse objects such as nebulae and star clusters.<\/li>\n<li><strong>Back focus :<\/strong> The rear focal length is a standard 55 mm, ensuring compatibility with a wide range of accessories and astrophotography cameras.<\/li>\n<li><strong>Full-frame compatibility :<\/strong> This reducer is optimized for full-frame sensors, offering even coverage and vignetting-free images.<\/li>\n<\/ul>\n<h3>Dimensions and technical design<\/h3>\n<ul>\n<li><strong>Outside diameter :<\/strong> 72 mm, offering a robust and stable construction for astrophotography configurations.<\/li>\n<li><strong>Total length :<\/strong> 63 mm, with a compact design that facilitates mounting on FRA400 systems.<\/li>\n<li><strong>Front thread :<\/strong> M61*1, providing a stable and secure connection to the FRA400 astrograph.<\/li>\n<li><strong>Rear thread :<\/strong> M48*0.75, designed to accommodate 2\" filters directly, making filter installation quick and easy for users.<\/li>\n<\/ul>\n<h3>Benefits for astrophotographers<\/h3>\n<p>By reducing exposure time and increasing field of view, this reducer is ideal for astrophotographers wishing to capture high-quality deep-sky images. The ability to add 2\" filters via the built-in M48*0.75 thread facilitates observations of nebulae and other celestial objects requiring specialized filters.<\/p>","protected":false},"excerpt":{"rendered":"<p>R\u00e9ducteur Askar F3.9 0.7x Full-Frame pour FRA400 &#8211; Sp\u00e9cifications et caract\u00e9ristiques Le r\u00e9ducteur Askar F3.9 0.7x est con\u00e7u pour optimiser les performances de l\u2019astrographe FRA400, en r\u00e9duisant sa longueur focale d\u2019origine de 400 mm tout en abaissant le rapport focal pour des expositions plus courtes et un champ de vision plus large. Ce mod\u00e8le est [&hellip;]<\/p>\n","protected":false},"featured_media":6761,"comment_status":"open","ping_status":"closed","template":"","meta":[],"product_brand":[382],"product_cat":[650],"product_tag":[],"class_list":{"0":"post-1282","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_brand-askar","7":"product_cat-rducteurs-correcteurs-ap","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\/1282","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=1282"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/media\/6761"}],"wp:attachment":[{"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/media?parent=1282"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/product_brand?post=1282"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/product_cat?post=1282"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/product_tag?post=1282"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}