{"title":"Askar Flatteners \u0026 Reducers","description":"\u003cp\u003eAskar Flatteners \u0026amp; Reducers. Part of \u003ca href=\"\/collections\/flatteners-and-reducers\"\u003eFlatteners, Reducers \u0026amp; Correctors\u003c\/a\u003e.\u003c\/p\u003e","products":[{"product_id":"f3-9-full-frame-reducer-for-fra400-fra500","title":"F3.9 Full Frame Reducer for FRA400\/FRA500","description":"\u003cspan style=\"color: rgb(68, 68, 68); font-size: 12pt; text-align: justify; font-family: Arial;\"\u003eAskar provides a brand-new F3.9 full frame reducer for FRA400 astrograph, further reducing the focal length and thus shortening the exposure time on its original 400 focal length and f\/5.6 focal ratio design basis. The reduction factor is 0.7×, and the reduced focal length is 280mm, which can satisfy most deep-sky astrophotography. The back focus is standard 55mm. The reducer has built-in M48×0.75 thread, easy for the attachment of 2\" filters.\u003c\/span\u003e\u003cbr style=\"outline: none; box-sizing: border-box; color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei justify font-size:=\"\" text-align:=\"\"\u003e","brand":"Askar","offers":[{"title":"Default Title","offer_id":44013705789551,"sku":"FRA400\/500 Reducer","price":397.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/1588757507__61682.jpg?v=1766560228"},{"product_id":"askar-107phq-130-150-phq-universal-reducer","title":"Askar 107PHQ\/130\/150 PHQ Universal reducer","description":"\u003cspan style=\"color: rgb(68, 68, 68); font-family: Arial; font-size: 14px;\"\u003eAskar’s new-launched 3” 0.7x full-frame reducer adapts for 107PHQ \u0026amp; 130PHQ.  \u003c\/span\u003e\u003cspan style=\"color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei font-size:=\"\"\u003eIt has a triplet design with one ED glass. \u003c\/span\u003e\u003cdiv\u003e\n\u003cdiv\u003e\n\u003cdiv style=\"outline: none; box-sizing: border-box; margin: 0px; padding: 0px; color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei font-size:\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv style=\"outline: none; box-sizing: border-box; margin: 0px; padding: 0px; color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei font-size:\u003eThe 0.7x reduction gives 107PHQ a shortened focal ratio of 4.9 and a shortened focal length of 524mm. This reducer, connected with the astrographs, can  effectively shorten the exposure time and dramatically increase your field of view, bringing more convenience and possibilities for your deep-sky astrophotography.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Askar","offers":[{"title":"Default Title","offer_id":44013794394223,"sku":"107PHQ-Reducer","price":557.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/1655171628__85803.jpg?v=1766562978"},{"product_id":"160apo-1x-full-frame-flattener","title":"160APO 1x Full-frame Flattener","description":"\u003cp\u003e\u003cspan\u003eThe Askar 160 APO comes with three optional premium accessories, a 1.0x flattener and a 0.8x reducer. Introduced here is the 1.0x flattener, which is optimized for the Askar 160APO, and can provide more possibilities for telescope use.\u003c\/span\u003e\u003c\/p\u003e\n\u003cdiv id=\"ie_fimg-1736818366331\" class=\"ie_fimg\"\u003e\n\u003cdiv\u003e\u003cimg src=\"https:\/\/omo-oss-image.thefastimg.com\/portal-saas\/pg2024111409483993253\/cms\/image\/c143bdb5-29f0-4174-ba8f-6b526dcf3732.jpg\" alt=\"长友气体\"\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv id=\"ie_line-1736818366581\" class=\"ie_line\"\u003e\n\u003cdiv\u003e \u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv id=\"ie_text-1736818366586\" class=\"reset_style\"\u003e\n\u003cdiv\u003e\n\u003cp\u003e\u003cspan\u003eThe 1.0x flattener does not change the telescope's focal ratio itself. After connecting with the Askar 160APO, it still maintained a focal ratio of 7. The flattener corrects field curvature and coma, resulting in flatter field edges and finer star points.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe 1.0x flattener adopts a triplet design and supports a 44mm full-frame image circle.  The back focus from the M48 thread is a standard 55mm. The front thread is M92*1. At the camera end, it is equipped with M68*1, M54*0.75, and M48*0.75 three sizes of adapters, which are convenient for connection. At the same time, it has a built-in M48*0.75 2-inch filter thread, which can be directly installed and used. The overall CNC machined, both end threaded metal caps prevent ash when not in use.\u003c\/span\u003e\u003c\/p\u003e\n\u003cfigure class=\"table\"\u003e\n\u003ctable width=\"84.20%\" cellspacing=\"0\" align=\"center\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd colspan=\"3\"\u003e\n\u003cp\u003e\u003cstrong\u003e1x Flattener Size Diagram\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003cp\u003e\u003cimg class=\"image_resized\" src=\"https:\/\/omo-oss-image.thefastimg.com\/portal-saas\/pg2024111409483993253\/cms\/image\/d9b2c108-4323-4eef-9ba7-2fd468ea243c.jpg\" alt=\"长友气体\"\u003e\u003c\/p\u003e\n\u003cfigure class=\"table\"\u003e\n\u003ctable width=\"84.20%\" cellspacing=\"0\" align=\"center\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd colspan=\"3\"\u003e\n\u003cp\u003e\u003cstrong\u003e1x Flattener Installation\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003cp\u003e\u003cimg class=\"image_resized\" src=\"https:\/\/omo-oss-image.thefastimg.com\/portal-saas\/pg2024111409483993253\/cms\/image\/6fac3c9d-95bd-414a-83dd-4ad887ac02bf.jpg\" alt=\"长友气体\"\u003e\u003c\/p\u003e\n\u003cfigure class=\"table\"\u003e\n\u003ctable width=\"84.20%\" cellspacing=\"0\" align=\"center\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd colspan=\"3\"\u003e\n\u003cp\u003e\u003cstrong\u003eSpot Diagram\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003cp\u003e\u003cimg class=\"image_resized\" src=\"https:\/\/omo-oss-image.thefastimg.com\/portal-saas\/pg2024111409483993253\/cms\/image\/850a58d0-a499-44f1-a227-16642dce87c5.jpg\" alt=\"长友气体\"\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Askar","offers":[{"title":"Default Title","offer_id":44014108541039,"sku":"ASK-Flat-APO-160","price":477.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/36dcdff4-2634-48ac-baae-73f8f7cb8932__39041.png?v=1766571594"},{"product_id":"160apo-0-8x-full-frame-reducer","title":"160APO 0.8x Full-frame Reducer","description":"\u003cp\u003e\u003cspan\u003eThe Askar 160 APO comes with three optional premium accessories, a 1.0x flattener and a 0.8x reducer. Introduced here is the 0.8x reducer, which is optimized for the Askar 160APO, and can provide more possibilities for telescope use.\u003c\/span\u003e\u003c\/p\u003e\n\u003cdiv id=\"ie_fimg-1736818366331\" class=\"ie_fimg\"\u003e\n\u003cdiv\u003e\u003cimg src=\"https:\/\/omo-oss-image.thefastimg.com\/portal-saas\/pg2024111409483993253\/cms\/image\/c143bdb5-29f0-4174-ba8f-6b526dcf3732.jpg\" alt=\"长友气体\"\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv id=\"ie_line-1736818366581\" class=\"ie_line\"\u003e\n\u003cdiv\u003e \u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv id=\"ie_text-1736818366586\" class=\"reset_style\"\u003e\n\u003cdiv\u003e\n\u003cp\u003e\u003cspan\u003eThe 0.8x reducer can bring Askar 160APO's focal ratio down to F5.6. This is a standard reducer with field flattening capabilities as well. A shorter focal ratio allows the OTA to have a wider field of view and faster exposure times, making it suitable for capturing large areas of nebulae, star clusters, and faint, fast-moving celestial objects.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe 0.8x reducer adopts a quadruplet design and supports a 44mm full-frame image circle. The back focus from the M48 thread is a standard 55mm. The front thread is M92*1. At the camera end, it is equipped with M68*1, M54*0.75, and M48*0.75 three sizes of adapters, which are convenient for connection. At the same time, it has a built-in M48*0.75 2-inch filter thread, which can be directly installed and used. The overall CNC machined, both end threaded metal caps prevent ash when not in use.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cfigure class=\"table\"\u003e\n\u003ctable width=\"84.20%\" cellspacing=\"0\" align=\"center\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd colspan=\"3\"\u003e\n\u003cp\u003e\u003cstrong\u003e0.8x Reducer Size Diagram\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003cp\u003e\u003cimg class=\"image_resized\" src=\"https:\/\/omo-oss-image.thefastimg.com\/portal-saas\/pg2024111409483993253\/cms\/image\/95ffac13-afa4-40d1-abfb-0be35dfbf66a.jpg\" alt=\"长友气体\"\u003e\u003c\/p\u003e\n\u003cfigure class=\"table\"\u003e\n\u003ctable width=\"84.20%\" cellspacing=\"0\" align=\"center\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd colspan=\"3\"\u003e\n\u003cp\u003e\u003cstrong\u003e0.8x Reducer Installation\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003cp\u003e\u003cimg class=\"image_resized\" src=\"https:\/\/omo-oss-image.thefastimg.com\/portal-saas\/pg2024111409483993253\/cms\/image\/24d58b5c-6e62-4a3d-986a-861875d627e5.jpg\" alt=\"长友气体\"\u003e\u003c\/p\u003e\n\u003cfigure class=\"table\"\u003e\n\u003ctable width=\"84.20%\" cellspacing=\"0\" align=\"center\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd colspan=\"3\"\u003e\n\u003cp\u003e\u003cstrong\u003eSpot Diagram\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003cp\u003e\u003cimg class=\"image_resized\" src=\"https:\/\/omo-oss-image.thefastimg.com\/portal-saas\/pg2024111409483993253\/cms\/image\/b288cb06-5853-4709-9b0a-e7de4729884c.jpg\" alt=\"长友气体\"\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Askar","offers":[{"title":"Default Title","offer_id":44014108704879,"sku":"ASK-0.8-APO-160","price":477.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/Askar_160_reducer__35581.png?v=1766571613"},{"product_id":"askar-131f-0-74-focal-reducer","title":"Askar 131F 0.74× Focal Reducer","description":"\u003ch2\u003eAskar 131F 0.74× Focal Reducer — For the Askar 131F Flat-Field Astrograph\u003c\/h2\u003e\n\n\u003cp\u003eThe \u003cstrong\u003eAskar 131F 0.74× Reducer\u003c\/strong\u003e is a dedicated focal reducer designed exclusively for the Askar 131F Flat-Field astrograph. It reduces the 131F’s native f\/7.5 focal ratio down to f\/5.6, shortening the effective focal length from 983mm to 733.6mm. This delivers a wider field of view and significantly faster exposures — roughly 80% of the original exposure time — making it particularly valuable for capturing large nebulae, expansive star fields, faint emission structures, and fast-moving or time-sensitive celestial events.\u003c\/p\u003e\n\n\u003cp\u003eIn addition to reducing the focal ratio, the reducer incorporates built-in field-flattening correction that eliminates field curvature across the 44mm full-frame image circle. Stars remain sharp and round from the centre of the frame to the corners, with no additional flattener required at the reduced focal ratio.\u003c\/p\u003e\n\n\u003cp\u003eThe optical design uses a triplet lens group for smooth, well-corrected reduction across the full field. The standard back focus distance is 55mm measured from the M48×0.75 male thread. Both ends of the reducer body feature M72×1 threads. The package includes M54×0.75 and M48×0.75 adapter rings for direct connection to the 131F’s photographic extension tube, and the rear adapter ring has a built-in M48×0.75 standard 2\" filter thread for direct filter installation. The body is precision CNC-machined and ships with protective metal thread caps on both ends.\u003c\/p\u003e\n\n\u003ch2\u003eWho Is This Product Best For?\u003c\/h2\u003e\n\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAskar 131F owners\u003c\/strong\u003e who image large nebulae, emission regions, or wide star fields and want a broader field of view without changing telescopes.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eImagers in light-polluted skies\u003c\/strong\u003e who benefit from the faster f\/5.6 ratio to shorten sub-exposure times.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNarrowband and broadband filter users\u003c\/strong\u003e who want the faster ratio for more efficient filter imaging.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAstrophotographers\u003c\/strong\u003e who want to switch between the native f\/7.5 (for tighter framing) and f\/5.6 (for wider field) without buying a second telescope.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWhy Choose the Askar 131F 0.74× Reducer?\u003c\/h2\u003e\n\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDedicated design\u003c\/strong\u003e — optically optimized specifically for the 131F, not a generic reducer. Delivers consistent correction across the full 44mm image circle at the reduced ratio.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBuilt-in field flattening\u003c\/strong\u003e — no additional flattener needed at f\/5.6; the reducer handles both reduction and correction simultaneously.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFaster imaging\u003c\/strong\u003e — f\/5.6 vs f\/7.5 means roughly 44% less exposure time needed for the same signal level.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWider field\u003c\/strong\u003e — 733.6mm focal length vs 983mm gives approximately 26% more field width in each direction.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eStandard back focus\u003c\/strong\u003e — 55mm from M48 thread eliminates guesswork; direct adapter connections included in the box.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFilter-ready rear\u003c\/strong\u003e — built-in M48×0.75 thread accepts standard 2\" astronomy filters without an additional adapter.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCNC precision body with dust caps\u003c\/strong\u003e — professional-grade build quality with protective metal end caps.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eRecommended Uses\u003c\/h2\u003e\n\n\u003cul\u003e\n  \u003cli\u003eWide-field deep-sky nebula imaging with the Askar 131F\u003c\/li\u003e\n  \u003cli\u003eLarge emission and reflection nebulae (Orion, Rosette, North America, etc.)\u003c\/li\u003e\n  \u003cli\u003eGalaxy groups and clusters requiring wider framing\u003c\/li\u003e\n  \u003cli\u003eNarrowband and broadband filter imaging in light-polluted sites\u003c\/li\u003e\n  \u003cli\u003eTime-lapse or short-exposure widefield astrophotography\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eCompatibility and Accessory Notes\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eCompatible telescope:\u003c\/strong\u003e Askar 131F Flat-Field only. Not designed for use with any other telescope.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eConnection:\u003c\/strong\u003e The 131F’s photographic extension tube connects directly to the reducer via the included M54×0.75 or M48×0.75 adapter rings. Both end threads on the reducer body are M72×1.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eBack focus:\u003c\/strong\u003e 55mm from the base of the M48×0.75 male thread. No additional spacing calculation required when using the supplied adapters.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eFilter compatibility:\u003c\/strong\u003e The built-in rear M48×0.75 thread accepts standard 2\" (48mm) astronomy filters directly.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eCamera compatibility:\u003c\/strong\u003e Works with any camera system that connects via the included M54 or M48 adapter rings — DSLRs with T-rings, and dedicated astronomy cameras with M54 or M48 nose threads.\u003c\/p\u003e\n\n\u003ch2\u003eImportant Limitations\u003c\/h2\u003e\n\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003e131F only\u003c\/strong\u003e — this reducer is not compatible with the 91F, 111F, or any other telescope. Each F Series model has its own dedicated reducer.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNot for visual observing\u003c\/strong\u003e — focal reducers are imaging-only accessories and are not used with eyepieces.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e55mm back focus must be respected\u003c\/strong\u003e — using spacers or adapters that change the back focus distance from the specified 55mm will degrade corner star quality.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat does the 0.74× reducer do to the 131F?\u003c\/strong\u003e\u003cbr\u003eIt reduces the focal length from 983mm to 733.6mm and the focal ratio from f\/7.5 to f\/5.6, giving a wider field of view and faster exposures.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eDoes it work on the 91F or 111F?\u003c\/strong\u003e\u003cbr\u003eNo. Each F Series telescope has its own dedicated reducer. The 91F uses the 0.75× Reducer and the 111F uses the 0.74× Reducer — both are different products.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eDo I still need a field flattener at f\/5.6?\u003c\/strong\u003e\u003cbr\u003eNo. The reducer has field-flattening correction built in and covers the full 44mm image circle with sharp stars to the corners.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat is the back focus distance?\u003c\/strong\u003e\u003cbr\u003e55mm measured from the base of the M48×0.75 male thread on the rear of the reducer.\u003c\/p\u003e\n\n\u003ch2\u003eOur Recommendation\u003c\/h2\u003e\n\n\u003cp\u003eAt Ontario Telescope and Accessories, we consider the \u003cstrong\u003eAskar 131F 0.74× Reducer\u003c\/strong\u003e a worthwhile companion purchase for any 131F owner who does wide-field deep-sky imaging. The improvement in field width and exposure speed is significant, and the fact that it handles both reduction and field flattening in one unit keeps the imaging train simple. If you own a 131F and shoot large nebulae or work under moderate light pollution, this reducer will meaningfully expand what you can do with the telescope.\u003c\/p\u003e","brand":"Askar","offers":[{"title":"Default Title","offer_id":53154396668015,"sku":"131F-REDUCER-074X","price":418.6,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/39700a9a-6969-4a4b-bb2c-f65eb7ad5c26.png?v=1779667444"},{"product_id":"askar-111f-0-74-focal-reducer","title":"Askar 111F 0.74× Focal Reducer","description":"\u003ch2\u003eAskar 111F 0.74× Focal Reducer — For the Askar 111F Flat-Field Astrograph\u003c\/h2\u003e\n\n\u003cp\u003eThe \u003cstrong\u003eAskar 111F 0.74× Reducer\u003c\/strong\u003e is a dedicated focal reducer designed exclusively for the Askar 111F Flat-Field astrograph. It reduces the 111F’s native f\/6.9 focal ratio down to f\/5.1, shortening the effective focal length from 766mm to 566mm. This produces a wider field of view and a faster optical system that reduces exposure times — making it ideal for large nebulae, expansive emission regions, and imaging sessions where efficiency matters.\u003c\/p\u003e\n\n\u003cp\u003eThe reducer incorporates built-in field-flattening correction, eliminating field curvature and ensuring sharp, round stars from the centre of the frame all the way to the corners of a 44mm full-frame image circle. No additional flattener is required at the reduced focal ratio.\u003c\/p\u003e\n\n\u003cp\u003eThe optical design features a triplet lens group for smooth, well-corrected reduction. The standard back focus distance is 55mm from the M48×0.75 male thread. Both ends of the reducer body feature M68×1 threads. The 111F’s photographic extension tube connects directly via the included M54×0.75 and M48×0.75 adapter rings. The rear adapter ring has a built-in M48×0.75 standard 2\" filter thread. The body is precision CNC-machined and ships with protective metal thread caps on both ends.\u003c\/p\u003e\n\n\u003ch2\u003eWho Is This Product Best For?\u003c\/h2\u003e\n\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAskar 111F owners\u003c\/strong\u003e who image large nebulae or wide star fields and want a broader field of view and faster exposures.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eImagers in light-polluted environments\u003c\/strong\u003e who benefit from the faster f\/5.1 ratio to shorten sub-exposure times.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNarrowband and broadband filter users\u003c\/strong\u003e wanting more imaging efficiency from their 111F setup.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePhotographers who want flexibility\u003c\/strong\u003e — switching between the native f\/6.9 (for tighter framing and higher resolution) and f\/5.1 (for wider field) without a second telescope.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWhy Choose the Askar 111F 0.74× Reducer?\u003c\/h2\u003e\n\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDedicated design\u003c\/strong\u003e — optimized specifically for the 111F; delivers consistent, well-corrected performance across the full 44mm image circle at f\/5.1.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBuilt-in field flattening\u003c\/strong\u003e — one accessory handles both reduction and corner correction simultaneously.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSignificantly faster system\u003c\/strong\u003e — f\/5.1 vs f\/6.9 means roughly 45% less exposure time required for the same signal.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWider field\u003c\/strong\u003e — 566mm vs 766mm focal length gives approximately 26% more field width per axis.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eStandard 55mm back focus\u003c\/strong\u003e — no spacing guesswork; direct adapter connections are included.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFilter-ready\u003c\/strong\u003e — built-in M48×0.75 rear thread accepts standard 2\" astronomy filters directly.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCNC body with protective caps\u003c\/strong\u003e — professional build quality with dust-proof metal end caps.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eRecommended Uses\u003c\/h2\u003e\n\n\u003cul\u003e\n  \u003cli\u003eWide-field deep-sky nebula imaging with the Askar 111F\u003c\/li\u003e\n  \u003cli\u003eLarge emission and reflection nebulae\u003c\/li\u003e\n  \u003cli\u003eGalaxy groups and wide star fields requiring broader framing\u003c\/li\u003e\n  \u003cli\u003eNarrowband and broadband filter imaging\u003c\/li\u003e\n  \u003cli\u003eEfficient imaging from light-polluted sites\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eCompatibility and Accessory Notes\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eCompatible telescope:\u003c\/strong\u003e Askar 111F Flat-Field only. Not compatible with the 91F, 131F, or other telescopes.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eConnection:\u003c\/strong\u003e Connects via the 111F’s photographic extension tube using the included M54×0.75 or M48×0.75 adapter rings. Both ends of the reducer body are M68×1 threads.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eBack focus:\u003c\/strong\u003e 55mm from the base of the M48×0.75 male thread. No additional spacing calculation required when using the supplied adapters.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eFilter compatibility:\u003c\/strong\u003e Built-in rear M48×0.75 thread accepts standard 2\" astronomy filters directly.\u003c\/p\u003e\n\n\u003ch2\u003eImportant Limitations\u003c\/h2\u003e\n\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003e111F only\u003c\/strong\u003e — this reducer is not compatible with the 91F, 131F, or any other telescope in the F Series.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNot for visual observing\u003c\/strong\u003e — focal reducers are imaging-only accessories.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e55mm back focus must be respected\u003c\/strong\u003e — altering the back focus distance from 55mm will degrade corner star quality.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat does this reducer do to the 111F?\u003c\/strong\u003e\u003cbr\u003eIt reduces the focal length from 766mm to 566mm and the focal ratio from f\/6.9 to f\/5.1, giving a wider field of view and faster exposures.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eDoes it work on the 91F or 131F?\u003c\/strong\u003e\u003cbr\u003eNo. Each F Series telescope requires its own dedicated reducer. The 91F uses the 0.75× Reducer (M59 thread) and the 131F uses a different 0.74× Reducer (M72 thread).\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eDo I need a separate flattener at f\/5.1?\u003c\/strong\u003e\u003cbr\u003eNo. Field flattening is built into the reducer and covers the full 44mm image circle.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat is the back focus distance?\u003c\/strong\u003e\u003cbr\u003e55mm from the base of the M48×0.75 male thread on the rear of the reducer.\u003c\/p\u003e\n\n\u003ch2\u003eOur Recommendation\u003c\/h2\u003e\n\n\u003cp\u003eAt Ontario Telescope and Accessories, we recommend the \u003cstrong\u003eAskar 111F 0.74× Reducer\u003c\/strong\u003e as a natural pairing for any 111F owner who regularly images large nebulae or works under light-polluted skies. The step from f\/6.9 to f\/5.1 is meaningful in practice — combined with the wider field, it transforms the 111F into a noticeably more capable wide-field imaging system. For 111F owners who haven’t yet added a reducer, this is the one accessory most likely to expand their imaging possibilities.\u003c\/p\u003e","brand":"Askar","offers":[{"title":"Default Title","offer_id":53154397028463,"sku":"111F-REDUCER-074X","price":418.6,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/1b1d4dbf-a360-4f29-a533-6f4e17a2feed.png?v=1779667504"},{"product_id":"askar-91f-0-75-focal-reducer","title":"Askar 91F 0.75× Focal Reducer","description":"\u003ch2\u003eAskar 91F 0.75× Focal Reducer — For the Askar 91F Flat-Field Astrograph\u003c\/h2\u003e\n\n\u003cp\u003eThe \u003cstrong\u003eAskar 91F 0.75× Reducer\u003c\/strong\u003e is a dedicated focal reducer designed exclusively for the Askar 91F Flat-Field astrograph. It reduces the 91F’s native f\/6.7 focal ratio down to f\/5, shortening the effective focal length from 609mm to 455mm. This delivers a noticeably wider field of view and a faster optical system that meaningfully reduces exposure times — particularly useful for large nebulae, wide star fields, and imaging from light-polluted locations.\u003c\/p\u003e\n\n\u003cp\u003eAlongside focal reduction, the reducer incorporates built-in field-flattening correction that eliminates field curvature across the full 44mm image circle. Stars are sharp and round from the centre to the corners of a full-frame sensor, with no additional flattener required at the reduced ratio.\u003c\/p\u003e\n\n\u003cp\u003eThe optical design uses a triplet lens group for smooth, well-corrected reduction. The standard back focus distance is 55mm from the M48×0.75 male thread. Both ends of the reducer body feature M59×1 threads. The 91F’s photographic extension tube connects directly via the included M54×0.75 and M48×0.75 adapter rings. The rear adapter ring has a built-in M48×0.75 standard 2\" filter thread for direct filter installation. The body is precision CNC-machined and ships with protective metal thread caps on both ends to guard against dust when not in use.\u003c\/p\u003e\n\n\u003ch2\u003eWho Is This Product Best For?\u003c\/h2\u003e\n\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAskar 91F owners\u003c\/strong\u003e who want a wider field of view and faster exposures for large nebulae and star fields.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eImagers in light-polluted skies\u003c\/strong\u003e who benefit from the faster f\/5 ratio to shorten sub-exposure times.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTravel astrophotographers\u003c\/strong\u003e already using the compact 91F who want to maximise field width on a lightweight setup.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNarrowband and broadband filter users\u003c\/strong\u003e who want more imaging speed from the 91F system.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUsers wanting flexibility\u003c\/strong\u003e between the native f\/6.7 (tighter framing, higher resolution) and f\/5 (wider field, faster) without a second telescope.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWhy Choose the Askar 91F 0.75× Reducer?\u003c\/h2\u003e\n\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDedicated design\u003c\/strong\u003e — optically optimized specifically for the 91F for consistent, well-corrected performance across the full 44mm image circle at f\/5.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBuilt-in field flattening\u003c\/strong\u003e — one accessory handles both reduction and corner correction simultaneously.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSignificantly faster system\u003c\/strong\u003e — f\/5 vs f\/6.7 means roughly 44% less exposure time required for the same signal.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWider field\u003c\/strong\u003e — 455mm vs 609mm focal length gives approximately 25% more field width per axis.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eStandard 55mm back focus\u003c\/strong\u003e — no spacing guesswork; direct adapter connections are included.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFilter-ready rear thread\u003c\/strong\u003e — built-in M48×0.75 accepts standard 2\" astronomy filters directly.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLightest F Series reducer\u003c\/strong\u003e — at just 0.3kg, adds virtually no weight penalty to the 91F travel setup.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCNC body with protective caps\u003c\/strong\u003e — professional build quality with dust-proof metal end caps for storage and transport.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eRecommended Uses\u003c\/h2\u003e\n\n\u003cul\u003e\n  \u003cli\u003eWide-field deep-sky nebula and star cluster imaging with the Askar 91F\u003c\/li\u003e\n  \u003cli\u003eLarge emission and reflection nebulae (Orion, Rosette, Heart and Soul, etc.)\u003c\/li\u003e\n  \u003cli\u003eMilky Way core and wide star field imaging\u003c\/li\u003e\n  \u003cli\u003eNarrowband and broadband filter imaging from light-polluted sites\u003c\/li\u003e\n  \u003cli\u003ePortable and travel astrophotography setups\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eCompatibility and Accessory Notes\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eCompatible telescope:\u003c\/strong\u003e Askar 91F Flat-Field only. Not compatible with the 111F, 131F, or any other telescope.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eConnection:\u003c\/strong\u003e Connects via the 91F’s photographic extension tube using the included M54×0.75 or M48×0.75 adapter rings. Both ends of the reducer body are M59×1 threads.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eBack focus:\u003c\/strong\u003e 55mm from the base of the M48×0.75 male thread. No additional spacing calculation required when using the supplied adapters.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eFilter compatibility:\u003c\/strong\u003e Built-in rear M48×0.75 thread accepts standard 2\" astronomy filters directly.\u003c\/p\u003e\n\n\u003ch2\u003eImportant Limitations\u003c\/h2\u003e\n\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003e91F only\u003c\/strong\u003e — not compatible with the 111F (which uses a 0.74× reducer with M68 threads) or the 131F (which uses a 0.74× reducer with M72 threads).\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNot for visual observing\u003c\/strong\u003e — focal reducers are imaging-only accessories and are not used with eyepieces.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e55mm back focus must be respected\u003c\/strong\u003e — using additional spacers that alter the back focus from 55mm will degrade corner star quality.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat does this reducer do to the 91F?\u003c\/strong\u003e\u003cbr\u003eIt reduces the focal length from 609mm to 455mm and the focal ratio from f\/6.7 to f\/5, giving a wider field of view and faster exposures.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eDoes it work on the 111F or 131F?\u003c\/strong\u003e\u003cbr\u003eNo. Each F Series telescope has its own dedicated reducer with different thread sizes. The 111F uses a 0.74× Reducer (M68 thread) and the 131F uses a 0.74× Reducer (M72 thread).\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eDo I need a flattener at f\/5?\u003c\/strong\u003e\u003cbr\u003eNo. Field flattening is built into the reducer and covers the full 44mm image circle.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat is the back focus?\u003c\/strong\u003e\u003cbr\u003e55mm from the base of the M48×0.75 male thread on the rear of the reducer.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eIs this suitable for a travel setup?\u003c\/strong\u003e\u003cbr\u003eYes. At 0.3kg it adds minimal weight and the compact size fits easily into any imaging kit bag.\u003c\/p\u003e\n\n\u003ch2\u003eOur Recommendation\u003c\/h2\u003e\n\n\u003cp\u003eAt Ontario Telescope and Accessories, we recommend the \u003cstrong\u003eAskar 91F 0.75× Reducer\u003c\/strong\u003e as an ideal companion for the 91F — particularly for imagers who primarily target large nebulae or who shoot from light-polluted sites where a faster focal ratio makes a real practical difference. At f\/5, the 91F system becomes one of the most capable and portable wide-field full-frame imaging setups available at this price point. For 91F owners who haven’t yet added a reducer, this is the single most impactful accessory purchase you can make for the telescope.\u003c\/p\u003e","brand":"Askar","offers":[{"title":"Default Title","offer_id":53154399125615,"sku":"91F-REDUCER-075X","price":278.6,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/697d8e02-5798-4712-9d20-77ec86f1ed18.png?v=1779667568"},{"product_id":"askar-fra400c-0-7x-full-frame-reducer","title":"Askar FRA400C 0.7x Full-Frame Reducer","description":"\u003ch2\u003eProduct Overview\u003c\/h2\u003e\u003cp\u003eThe Askar FRA400C 0.7x Full-Frame Reducer is the dedicated reducer for the Askar FRA400C astrograph. It changes the FRA400C system to 280mm focal length at f\/3.9 while maintaining full-frame imaging support and a standard 55mm back focus.\u003c\/p\u003e\u003ch2\u003eWho Is This Product Best For?\u003c\/h2\u003e\u003cp\u003eThis reducer is best for FRA400C owners who want faster exposures, a wider field of view, and a more efficient deep-sky imaging setup for large nebulae, star clusters, and wide-field targets.\u003c\/p\u003e\u003ch2\u003eWhy Choose This Product?\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eDedicated optical reducer for the FRA400C.\u003c\/li\u003e\n\u003cli\u003e0.7x reduction changes the FRA400C to 280mm at f\/3.9.\u003c\/li\u003e\n\u003cli\u003eTriplet reducer design with flat-field correction.\u003c\/li\u003e\n\u003cli\u003eSupports full-frame imaging when correctly spaced.\u003c\/li\u003e\n\u003cli\u003eM48x0.75 rear thread with built-in 2-inch filter thread.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eRecommended Uses\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eWide-field deep-sky astrophotography.\u003c\/li\u003e\n\u003cli\u003eLarge emission nebulae and star fields.\u003c\/li\u003e\n\u003cli\u003eFull-frame and APS-C camera setups on the FRA400C.\u003c\/li\u003e\n\u003cli\u003eFaster imaging sessions where shorter exposure times are helpful.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eCompatibility and Accessory Notes\u003c\/h2\u003e\u003cp\u003eThis reducer is designed specifically for the Askar FRA400C. It uses an M48x0.75 rear-end adapter and provides a standard 55mm back focus measured from the base of the M48 male thread. The built-in M48x0.75 filter thread supports standard 2-inch mounted filters.\u003c\/p\u003e\u003ch2\u003eImportant Limitations\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eDesigned for the FRA400C; do not assume compatibility with other telescopes.\u003c\/li\u003e\n\u003cli\u003eRequires correct 55mm camera spacing for best performance.\u003c\/li\u003e\n\u003cli\u003eNot useful for visual observing; this is primarily an imaging accessory.\u003c\/li\u003e\n\u003cli\u003eThe FRA400C telescope and camera adapters 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\u003eYes, for FRA400C owners who already understand basic camera spacing. Beginners should be careful to set the 55mm back focus correctly.\u003c\/p\u003e\u003ch3\u003eWhat is it best used for?\u003c\/h3\u003e\u003cp\u003eIt is best used for faster wide-field deep-sky imaging with the FRA400C.\u003c\/p\u003e\u003ch3\u003eDoes it work with full-frame cameras?\u003c\/h3\u003e\u003cp\u003eYes, the vendor specifies full-frame imaging support when used with the FRA400C and correct spacing.\u003c\/p\u003e\u003ch3\u003eDoes it require additional accessories?\u003c\/h3\u003e\u003cp\u003eMost imaging setups will still require the correct camera adapter or spacer combination to reach 55mm back focus.\u003c\/p\u003e\u003ch2\u003eOur Recommendation\u003c\/h2\u003e\u003cp\u003eOntario Telescope recommends this reducer for FRA400C owners who want the fastest, widest-field configuration available for that telescope. Do not choose it for visual-only use or for telescopes other than the FRA400C unless compatibility is confirmed.\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 FRA400C\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\u003e280mm on FRA400C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eReduced Focal Ratio\u003c\/th\u003e\n\u003ctd\u003ef\/3.9 on FRA400C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eLens Design\u003c\/th\u003e\n\u003ctd\u003eTriplet design\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBack Focus\u003c\/th\u003e\n\u003ctd\u003e55mm from the base of the M48 male thread\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eRear Thread\u003c\/th\u003e\n\u003ctd\u003eM48x0.75 with internal M48x0.75 2-inch filter thread\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWeight\u003c\/th\u003e\n\u003ctd\u003e0.46kg\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":53155909009519,"sku":"FRA400C-REDUCER","price":349.99,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/FRA400reducer.webp?v=1779736281"},{"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"},{"product_id":"askar-80phq-0-76x-full-frame-reducer","title":"Askar 80PHQ 0.76x Full Frame Reducer","description":"\u003ch2\u003eProduct Overview\u003c\/h2\u003e\n\u003cp\u003eThe Askar 80PHQ 0.76x Full Frame Reducer is a dedicated 3-inch reducer designed specifically for the Askar 80PHQ f\/7.5 astrograph. Its triplet optical design reduces the native 80PHQ system by 0.76x, changing the telescope to approximately f\/5.7 with a reduced focal length of 456mm.\u003c\/p\u003e\n\u003cp\u003eThis accessory is built for deep-sky astrophotographers who want a wider field of view and shorter exposure times while keeping the 80PHQ as the core imaging platform.\u003c\/p\u003e\n\n\u003ch2\u003eWho Is This Product Best For?\u003c\/h2\u003e\n\u003cp\u003eThis reducer is best for Askar 80PHQ owners who use their telescope primarily for astrophotography. It is especially useful for beginner-to-advanced deep-sky imagers who want to capture larger nebulae, wide star fields, and extended objects with a faster optical system than the native f\/7.5 configuration.\u003c\/p\u003e\n\n\u003ch2\u003eWhy Choose This Product?\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eDedicated reducer for the Askar 80PHQ astrograph.\u003c\/li\u003e\n  \u003cli\u003e0.76x reduction changes the 80PHQ from f\/7.5 to approximately f\/5.7.\u003c\/li\u003e\n  \u003cli\u003eReduces focal length to approximately 456mm for a wider imaging field.\u003c\/li\u003e\n  \u003cli\u003eHelps shorten exposure time for deep-sky astrophotography.\u003c\/li\u003e\n  \u003cli\u003eUses a 3-inch triplet reducer design for full-frame imaging support.\u003c\/li\u003e\n  \u003cli\u003eStandard 55mm back focus simplifies camera spacing for common astronomy imaging setups.\u003c\/li\u003e\n  \u003cli\u003eBuilt-in M48x0.75 2-inch filter thread supports convenient filter installation.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eRecommended Uses\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eWide-field deep-sky astrophotography with the Askar 80PHQ\u003c\/li\u003e\n  \u003cli\u003eLarge nebula and star-field imaging\u003c\/li\u003e\n  \u003cli\u003eFull-frame camera imaging with the 80PHQ\u003c\/li\u003e\n  \u003cli\u003eShorter exposure imaging compared with the native f\/7.5 configuration\u003c\/li\u003e\n  \u003cli\u003ePortable and semi-permanent imaging rigs using the 80PHQ\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eCompatibility and Accessory Notes\u003c\/h2\u003e\n\u003cp\u003eThis reducer is designed specifically for the Askar 80PHQ. When used with the 80PHQ f\/7.5 astrograph, it provides a reduced focal ratio of approximately f\/5.7 and a reduced focal length of approximately 456mm. The vendor specifies a standard 55mm back focus, and the reducer includes a built-in M48x0.75 2-inch filter thread.\u003c\/p\u003e\n\u003cp\u003eThe reducer connects through the 80PHQ photographic adapter system at the focuser end. Camera adapters, spacers, filters, filter drawers, and cameras are sold separately unless specifically included in a bundle.\u003c\/p\u003e\n\n\u003ch2\u003eImportant Limitations\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eThis is not a standalone imaging lens or telescope.\u003c\/li\u003e\n  \u003cli\u003eIt is designed for the Askar 80PHQ and should not be assumed compatible with other telescopes.\u003c\/li\u003e\n  \u003cli\u003eIt is for astrophotography, not visual observing.\u003c\/li\u003e\n  \u003cli\u003eAccurate 55mm camera-side back focus is required for best field correction.\u003c\/li\u003e\n  \u003cli\u003eIt will not turn the 80PHQ into a high-magnification planetary telescope; it widens the field and speeds up deep-sky imaging.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003ch3\u003eIs this reducer good for beginners?\u003c\/h3\u003e\n\u003cp\u003eYes, if the user already owns an Askar 80PHQ and understands basic camera spacing. The standard 55mm back focus is familiar for many astronomy camera setups, but spacing still needs to be measured carefully.\u003c\/p\u003e\n\u003ch3\u003eWhat is it best used for?\u003c\/h3\u003e\n\u003cp\u003eIt is best used for wide-field deep-sky astrophotography with the Askar 80PHQ, especially when a faster focal ratio and wider field are preferred.\u003c\/p\u003e\n\u003ch3\u003eIs it for visual observing or astrophotography?\u003c\/h3\u003e\n\u003cp\u003eThis is an astrophotography accessory. It is not recommended as a visual observing accessory.\u003c\/p\u003e\n\u003ch3\u003eWhat telescope is it compatible with?\u003c\/h3\u003e\n\u003cp\u003eIt is specifically designed for the Askar 80PHQ astrograph.\u003c\/p\u003e\n\u003ch3\u003eWhat camera spacing does it require?\u003c\/h3\u003e\n\u003cp\u003eThe vendor specifies a standard 55mm back focus.\u003c\/p\u003e\n\u003ch3\u003eDoes it accept filters?\u003c\/h3\u003e\n\u003cp\u003eYes. It includes a built-in M48x0.75 2-inch filter thread.\u003c\/p\u003e\n\u003ch3\u003eWhen should it not be recommended?\u003c\/h3\u003e\n\u003cp\u003eDo not recommend it to customers who do not own an 80PHQ, need a visual accessory, or want to increase focal length for small targets.\u003c\/p\u003e\n\n\u003ch2\u003eOur Recommendation\u003c\/h2\u003e\n\u003cp\u003eOntario Telescope recommends the Askar 80PHQ 0.76x Full Frame Reducer for 80PHQ owners who want to make their imaging system faster and wider without changing telescopes. It solves the problem of capturing larger deep-sky targets more efficiently. Choose the native 80PHQ configuration instead when more focal length and smaller image scale are preferred.\u003c\/p\u003e\n\n\u003ch2\u003eOptical Diagram Reports\u003c\/h2\u003e\n\u003cp\u003eThe following vendor-supplied graphic provides reducer information and specifications for the Askar 80PHQ imaging setup.\u003c\/p\u003e\n\u003cimg src=\"https:\/\/omo-oss-image.thefastimg.com\/portal-saas\/new2022072923460240318\/cms\/image\/f04d2907-9c73-45de-8f41-c2ca81c0ee90.jpg\" alt=\"Askar 80PHQ 0.76x full frame reducer specifications and imaging configuration diagram\"\u003e","brand":"Askar","offers":[{"title":"Default Title","offer_id":53156237574255,"sku":"80PHQ Reducer","price":368.2,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/80PHWREducera.webp?v=1779732870"},{"product_id":"askar-65phq-0-75x-full-frame-reducer","title":"Askar 65PHQ 0.75x Full Frame Reducer","description":"\u003ch2\u003eProduct Overview\u003c\/h2\u003e\n\u003cp\u003eThe Askar 65PHQ 0.75x Full Frame Reducer is a dedicated reducer designed for the Askar 65PHQ astrograph. Its quadruplet optical design reduces the native 65PHQ optical system by 0.75x, changing the telescope to approximately f\/4.8 with a reduced focal length of 312mm.\u003c\/p\u003e\n\u003cp\u003eThis accessory is intended for deep-sky astrophotographers who want a wider field of view, faster imaging speed, and full-frame camera support while continuing to use the 65PHQ as the main telescope.\u003c\/p\u003e\n\n\u003ch2\u003eWho Is This Product Best For?\u003c\/h2\u003e\n\u003cp\u003eThis reducer is best for Askar 65PHQ owners who want to make their imaging setup faster and wider. It is suitable for beginner, intermediate, and advanced astrophotographers using the 65PHQ for wide-field nebulae, Milky Way regions, large star fields, and portable deep-sky imaging rigs.\u003c\/p\u003e\n\n\u003ch2\u003eWhy Choose This Product?\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eDedicated reducer for the Askar 65PHQ astrograph.\u003c\/li\u003e\n  \u003cli\u003e0.75x reduction changes the 65PHQ from f\/6.4 to approximately f\/4.8.\u003c\/li\u003e\n  \u003cli\u003eReduces focal length to approximately 312mm for a wider field of view.\u003c\/li\u003e\n  \u003cli\u003eQuadruplet reducer design supports full-frame astrophotography.\u003c\/li\u003e\n  \u003cli\u003eStandard 55mm back focus works with many common astronomy camera setups.\u003c\/li\u003e\n  \u003cli\u003eBuilt-in M48x0.75 2-inch filter thread supports convenient filter installation.\u003c\/li\u003e\n  \u003cli\u003eExcellent option for faster imaging of large deep-sky objects.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eRecommended Uses\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eWide-field deep-sky imaging with the Askar 65PHQ\u003c\/li\u003e\n  \u003cli\u003eLarge nebula and star-field astrophotography\u003c\/li\u003e\n  \u003cli\u003eFull-frame camera imaging with the 65PHQ\u003c\/li\u003e\n  \u003cli\u003ePortable travel imaging rigs\u003c\/li\u003e\n  \u003cli\u003eShorter exposure imaging compared with the native f\/6.4 65PHQ configuration\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eCompatibility and Accessory Notes\u003c\/h2\u003e\n\u003cp\u003eThis reducer is designed specifically for the Askar 65PHQ. When installed on the 65PHQ, it provides a reduced focal ratio of approximately f\/4.8 and a reduced focal length of approximately 312mm. The vendor specifies a 55mm back focus and includes a built-in M48x0.75 2-inch filter thread.\u003c\/p\u003e\n\u003cp\u003eUse appropriate camera adapters, spacers, filter drawers, and filters to maintain the required back focus. Cameras, filters, spacers, and the telescope OTA are sold separately unless explicitly included in a bundle.\u003c\/p\u003e\n\n\u003ch2\u003eImportant Limitations\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eThis is not a standalone telescope or imaging lens.\u003c\/li\u003e\n  \u003cli\u003eIt is specifically intended for the Askar 65PHQ and should not be assumed compatible with other telescopes.\u003c\/li\u003e\n  \u003cli\u003eIt is an astrophotography accessory, not a visual observing accessory.\u003c\/li\u003e\n  \u003cli\u003eCorrect 55mm back focus is required for best edge performance.\u003c\/li\u003e\n  \u003cli\u003eIt widens the field and reduces focal length, so it is not the right choice when more magnification or smaller-target image scale is needed.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003ch3\u003eIs this reducer good for beginners?\u003c\/h3\u003e\n\u003cp\u003eYes, if the user already owns an Askar 65PHQ and is comfortable setting camera spacing. The 55mm back focus is common, but it still needs to be set accurately.\u003c\/p\u003e\n\u003ch3\u003eWhat is it best used for?\u003c\/h3\u003e\n\u003cp\u003eIt is best used for wide-field deep-sky astrophotography with the Askar 65PHQ, especially large nebulae, star fields, and travel imaging setups.\u003c\/p\u003e\n\u003ch3\u003eIs it for visual observing or astrophotography?\u003c\/h3\u003e\n\u003cp\u003eThis is an astrophotography accessory. It is not recommended for visual observing.\u003c\/p\u003e\n\u003ch3\u003eWhat telescope is it compatible with?\u003c\/h3\u003e\n\u003cp\u003eIt is designed for the Askar 65PHQ astrograph.\u003c\/p\u003e\n\u003ch3\u003eWhat camera spacing does it require?\u003c\/h3\u003e\n\u003cp\u003eThe required back focus is 55mm.\u003c\/p\u003e\n\u003ch3\u003eDoes it support full-frame cameras?\u003c\/h3\u003e\n\u003cp\u003eYes. The vendor identifies it as a full-frame reducer for the 65PHQ.\u003c\/p\u003e\n\u003ch3\u003eDoes it accept filters?\u003c\/h3\u003e\n\u003cp\u003eYes. It includes a built-in M48x0.75 2-inch filter thread.\u003c\/p\u003e\n\u003ch3\u003eWhen should it not be recommended?\u003c\/h3\u003e\n\u003cp\u003eDo not recommend it to users who do not own a 65PHQ, need a visual accessory, or want to keep the longest possible focal length for smaller objects.\u003c\/p\u003e\n\n\u003ch2\u003eOur Recommendation\u003c\/h2\u003e\n\u003cp\u003eOntario Telescope recommends the Askar 65PHQ 0.75x Full Frame Reducer for 65PHQ owners who want a faster, wider imaging system for large deep-sky targets. It solves the problem of making the 65PHQ more efficient for wide-field imaging while maintaining a dedicated optical match. Use the native 65PHQ configuration instead when maximum focal length is preferred.\u003c\/p\u003e\n\n\u003ch2\u003eOptical Diagram Reports\u003c\/h2\u003e\n\u003cp\u003eThe following vendor-supplied graphics provide reducer specifications and optical information for the Askar 65PHQ imaging setup.\u003c\/p\u003e\n\u003cimg src=\"https:\/\/omo-oss-image.thefastimg.com\/common\/design\/detail\/f2def78b-5514-4090-af14-caeb9eab1b02.jpg\" alt=\"Askar 65PHQ 0.75x full frame reducer product and specification diagram\"\u003e\n\u003cimg src=\"https:\/\/omo-oss-image.thefastimg.com\/portal-saas\/new2022072923460240318\/cms\/image\/53e955bc-f95d-4914-8037-047dbeaa213c.jpg\" alt=\"Askar 65PHQ 0.75x full frame reducer optical diagram and imaging configuration\"\u003e","brand":"Askar","offers":[{"title":"Default Title","offer_id":53156241211503,"sku":"65PHQ-0.75","price":299.6,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/65PHQReducer_e6afcfaa-4a05-4d8e-9105-faa469f66206.webp?v=1779732895"},{"product_id":"askar-1x-full-frame-flattener-for-103apo","title":"Askar 1x Full-frame Flattener for 103APO","description":"\u003cp\u003e\u003cspan\u003eThe 1x flattener does not change the telescope's focal ratio itself. After connecting with the Askar 103APO, it still maintained a focal length of 6.8. The flattener corrects field curvature and coma, resulting in flatter field edges and finer star points.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe 1.0x flattener adopts a triplet design and supports a 44mm full-frame image circle. The overall weight is 0.58kg. The back focus from the M48 thread is a standard 55mm. The front thread is M84*1. At the camera end, it is equipped with M54*0.75 and M48*0.75 two sizes of adapters, which are convenient for connection. At the same time, it has a built-in M48*0.75 2-inch filter thread, which can be directly installed and used. The overall CNC machined, both end threaded metal caps prevent ash when not in use.\u003c\/span\u003e\u003c\/p\u003e","brand":"Askar","offers":[{"title":"Default Title","offer_id":54035100794991,"sku":null,"price":300.0,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/IMG-6936.webp?v=1786728372"}],"url":"https:\/\/ontariotelescope.com\/collections\/fr-askar.oembed","provider":"Ontario Telescope and Accessories","version":"1.0","type":"link"}