{"product_id":"askar-f3-9-full-frame-reducer-for-fra600","title":"Askar F3.9 Full Frame Reducer for FRA600","description":"\u003ch2\u003eProduct Overview\u003c\/h2\u003e\u003cp\u003eThe Askar F3.9 Full Frame Reducer for FRA600 is the dedicated focal reducer for the Askar FRA600 astrograph. It reduces the native 600mm f\/5.6 system to a faster 420mm f\/3.9 imaging configuration, making the FRA600 better suited to wide-field deep-sky imaging and shorter exposure times.\u003c\/p\u003e\u003ch2\u003eWho Is This Product Best For?\u003c\/h2\u003e\u003cp\u003eThis reducer is best for FRA600 owners who want a faster optical system, a wider field of view, and full-frame imaging support for large nebulae, star fields, and extended deep-sky targets.\u003c\/p\u003e\u003ch2\u003eWhy Choose This Product?\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eDedicated reducer for the Askar FRA600.\u003c\/li\u003e\n\u003cli\u003e0.7x reduction changes the FRA600 to 420mm at f\/3.9.\u003c\/li\u003e\n\u003cli\u003eDesigned for full-frame imaging with the FRA600.\u003c\/li\u003e\n\u003cli\u003eStandard 55mm back focus for common astronomy camera setups.\u003c\/li\u003e\n\u003cli\u003eM48 connection with internal 2-inch filter thread support.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eRecommended Uses\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eFaster wide-field deep-sky imaging with the FRA600.\u003c\/li\u003e\n\u003cli\u003eLarge nebulae, star fields, and extended objects.\u003c\/li\u003e\n\u003cli\u003eFull-frame camera setups when correctly spaced.\u003c\/li\u003e\n\u003cli\u003eImaging configurations where shorter exposure times are desired.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eCompatibility and Accessory Notes\u003c\/h2\u003e\u003cp\u003eThis reducer is designed for the Askar FRA600. It provides a 0.7x reduction factor and should be spaced to the specified 55mm back focus from the camera side. It includes an internal M48x0.75 thread for standard 2-inch mounted filters.\u003c\/p\u003e\u003ch2\u003eImportant Limitations\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eDesigned for the FRA600; do not assume compatibility with other telescopes.\u003c\/li\u003e\n\u003cli\u003eRequires correct 55mm camera spacing for best optical performance.\u003c\/li\u003e\n\u003cli\u003ePrimarily an astrophotography accessory and not recommended for visual observing.\u003c\/li\u003e\n\u003cli\u003eThe FRA600 telescope, camera, adapters, and filters are not included.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\u003ch3\u003eIs this good for beginners?\u003c\/h3\u003e\u003cp\u003eIt is straightforward for FRA600 owners who understand camera spacing, but a beginner should confirm their adapter stack reaches the required 55mm back focus.\u003c\/p\u003e\u003ch3\u003eWhat is it best used for?\u003c\/h3\u003e\u003cp\u003eIt is best used for wide-field deep-sky imaging with the FRA600 at a faster f\/3.9 focal ratio.\u003c\/p\u003e\u003ch3\u003eDoes it work with full-frame cameras?\u003c\/h3\u003e\u003cp\u003eYes, it is intended as a full-frame reducer for the FRA600 when the imaging train is configured correctly.\u003c\/p\u003e\u003ch3\u003eDoes it require additional accessories?\u003c\/h3\u003e\u003cp\u003eMost setups will need the correct camera adapter or spacer combination to achieve 55mm back focus.\u003c\/p\u003e\u003ch2\u003eOur Recommendation\u003c\/h2\u003e\u003cp\u003eOntario Telescope recommends this reducer for FRA600 imagers who want a faster, wider-field configuration. Choose it for nebulae and large deep-sky objects; stay native at 600mm when you want a narrower field or more image scale.\u003c\/p\u003e\u003ctable class=\"product-specifications\"\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eProduct Type\u003c\/th\u003e\n\u003ctd\u003eDedicated reducer \/ field corrector\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCompatible Telescope\u003c\/th\u003e\n\u003ctd\u003eAskar FRA600\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eReduction Factor\u003c\/th\u003e\n\u003ctd\u003e0.7x\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eReduced Focal Length\u003c\/th\u003e\n\u003ctd\u003e420mm on FRA600\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eReduced Focal Ratio\u003c\/th\u003e\n\u003ctd\u003ef\/3.9 on FRA600\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBack Focus\u003c\/th\u003e\n\u003ctd\u003e55mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eConnection\u003c\/th\u003e\n\u003ctd\u003eM48 with internal M48x0.75 2-inch filter thread\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePrimary Use\u003c\/th\u003e\n\u003ctd\u003eFull-frame wide-field astrophotography\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e","brand":"Askar","offers":[{"title":"Default Title","offer_id":53155931455599,"sku":"FRA600-REDUCER","price":619.99,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/FMA600reducera.webp?v=1779736945","url":"https:\/\/ontariotelescope.com\/products\/askar-f3-9-full-frame-reducer-for-fra600","provider":"Ontario Telescope and Accessories","version":"1.0","type":"link"}