{"product_id":"askar-f3-9-0-7x-full-frame-reducer-professional-astronomical-accessory-dedicated-for-fra400c-astrograph","title":"Askar F3.9 0.7x Full-frame Reducer Professional Astronomical Accessory Dedicated for FRA400C Astrograph","description":"\u003cp\u003e\u003cb\u003eAskar F3.9 0.7x Full-frame Reducer Professional Astronomical Accessory Dedicated for FRA400C Astrograph\u003cbr\u003e\u003cbr\u003eDescription:\u003c\/b\u003e\u003cbr\u003e- Specially designed for the FRA400C, this 0.7x reducer adopts a triplet lens design, it can reduce the overall focal length to 280mm and the focal ratio to F3.9 while providing a flat-field correction. When used with the reducer, the FRA400C supports full-frame imaging and the back focus is a standard 55mm.\u003cbr\u003e\u003cbr\u003e- The shorter focal ratio enables the telescope to achieve a wider field of view and faster exposure times, making it ideal for shooting large nebulae, star clusters, as well as faint and fast-moving celestial objects.\u003cbr\u003e\u003cbr\u003e- The FRA400C reducer features an M48x0.75 rear-end adapter and has a built-in 2-inch filter thread for convenient filter attachment.\u003cbr\u003e\u003cbr\u003e\u003cb\u003eSpecification:\u003c\/b\u003e\u003cbr\u003e- (After attaching) FRA400C Focal length: 280mm\u003cbr\u003e- (After attaching) FRA400C Focal ratio: f\/3.9\u003cbr\u003e- Lens Number: Triplet design\u003cbr\u003e- Back Focus: 55mm (from the base of M48 male thread)\u003cbr\u003e- Weight: 0.46kg\u003cbr\u003e- Rear-end thread type: M48x0.75 (M48x0.75 filter thread inside)\u003cbr\u003e\u003cbr\u003e\u003cb\u003ePackage Included:\u003c\/b\u003e\u003cbr\u003e- 1 x Reducer\u003c\/p\u003e\u003cp\u003e\u003cimg style=\"width: 1024px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/99025\/99029-01.jpg\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg style=\"width: 1024px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/99025\/99029-02.jpg\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg style=\"width: 1024px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/99025\/99029-03.jpg\"\u003e\u003cbr\u003e\u003c\/p\u003e","brand":"Thanksbuyer Online,SDR Radio, Testers and Measurement devices, Astronomy products, Audio Amplifer and Decoders","offers":[{"title":"Default Title","offer_id":41028705550385,"sku":"99029","price":249.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0578\/4790\/6353\/files\/1759108244-1.jpg?v=1780321529","url":"https:\/\/www.thanksbuyer.com\/es\/products\/askar-f3-9-0-7x-full-frame-reducer-professional-astronomical-accessory-dedicated-for-fra400c-astrograph","provider":"Thanksbuyer Online,SDR Radio, Testers and Measurement devices, Astronomy products,  Audio Amplifer and Decoders","version":"1.0","type":"link"}