{"title":"Focal Reducers","description":"\u003cp\u003eFocal Reducers from every brand we carry. Part of \u003ca href=\"\/collections\/flatteners-and-reducers\"\u003eFlatteners, Reducers \u0026amp; Correctors\u003c\/a\u003e.\u003c\/p\u003e","products":[{"product_id":"f-6-3-focal-reducer-for-f-10-sct-visual-or-imaging","title":"F\/6.3 focal reducer for F\/10 SCT, visual or imaging","description":"\u003cp style=\"margin: 0px 0px 1em; padding: 0px; color: rgb(50, 50, 50); font-family: Arial, Helvetica, sans-serif; font-size: 12px; line-height: 16.2000007629395px; background-color: rgb(255, 255, 255);\"\u003eAntares' f\/6.3 focal reducer provides a faster f\/6.3 system for imaging or visual use when used with an f\/10 SCT or other compatible telescopes. This filter threads on to the rear cell of your Celestron or Meade SCT telescope. The female end attaches to the rear cell of the telescope. All additional accessories mount onto the exterior\/male threads. The reducer features fully coated optics in an anodized aluminum filter ring with an ergonomic rubber grip. It features a standard male SCT thread (2\" OD, 24 TPI) on one side and a standard SCT female thread on the other.\u003c\/p\u003e\u003cp style=\"margin: 0px 0px 1em; padding: 0px; color: rgb(50, 50, 50); font-family: Arial, Helvetica, sans-serif; font-size: 12px; line-height: 16.2000007629395px; background-color: rgb(255, 255, 255);\"\u003eThis is one of our best-selling items, and customers have reported that this product is at least as good as, and probably better than, other leading f\/6.3 focal reducers sold on the market for a lot more. However, even though the imprint on the item states \"Reducer \/ Corrector\" please note that his is a reducer only. It is not a corrector or flattener.\u003c\/p\u003e\u003cp style=\"margin: 0px 0px 1em; padding: 0px; color: rgb(50, 50, 50); font-family: Arial, Helvetica, sans-serif; font-size: 12px; line-height: 16.2000007629395px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"margin: 0px; padding: 0px; font-weight: 700;\"\u003eSpecifications:\u003c\/span\u003e\u003c\/p\u003e\u003cul style=\"margin: 0px 0px 1em; padding: 0px 0px 0px 3em; list-style-position: outside; list-style-image: initial; color: rgb(50, 50, 50); font-family: Arial, Helvetica, sans-serif; font-size: 12px; line-height: 16.2000007629395px; background-color: rgb(255, 255, 255);\"\u003e\n\u003cli style=\"margin: 0px; padding: 0px;\"\u003eFocal length = 220mm\u003c\/li\u003e\n\u003cli style=\"margin: 0px; padding: 0px;\"\u003eClear aperture = 40.8mm (1.60\") \u003c\/li\u003e\n\u003cli style=\"margin: 0px; padding: 0px;\"\u003eLength of male SCT thread = 5mm (0.2\") but this is preceded by an unthreaded part on the eyepiece side making the total length = 8.8mm (0.35\") \u003c\/li\u003e\n\u003cli style=\"margin: 0px; padding: 0px;\"\u003eLength of female SCT thread = 7.5mm (0.3\") \u003c\/li\u003e\n\u003cli style=\"margin: 0px; padding: 0px;\"\u003eWeight = 4.3oz.\u003c\/li\u003e\n\u003cli style=\"margin: 0px; padding: 0px;\"\u003eMade in Canada\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Antares","offers":[{"title":"Default Title","offer_id":44012347424879,"sku":"SCTFR","price":106.95,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/focalreducer__62973.png?v=1766547722"},{"product_id":"antares-0-5x-focal-reducer-1-25-visual-or-imaging","title":"Antares 0.5X focal reducer. 1.25\" visual or imaging","description":"\u003cp style=\"box-sizing: border-box; -webkit-font-smoothing: subpixel-antialiased; margin: 1em 0px; line-height: 18px; color: rgb(64, 64, 64); font-family: arial, sans-serif; font-size: 12px; background-color: rgb(255, 255, 255);\"\u003eVery Useful Reducer. Can Be Used With Any Telescope\u003c\/p\u003e\u003cp style=\"box-sizing: border-box; -webkit-font-smoothing: subpixel-antialiased; margin: 1em 0px; line-height: 18px; color: rgb(64, 64, 64); font-family: arial, sans-serif; font-size: 12px; background-color: rgb(255, 255, 255);\"\u003eThis superb 0.5x focal reducer has been designed to be used with a wide range of modern CCD cameras and eyepieces. The lens has a female 1.25\" eyepiece filter thread and can be attached to camera and eyepiece nose barrels to achieve a 40% increase in field of view. Basically the lens has the effect of reducing the focal length of the telescope by 40%.\u003c\/p\u003e\u003cp style=\"box-sizing: border-box; -webkit-font-smoothing: subpixel-antialiased; margin: 1em 0px; line-height: 18px; color: rgb(64, 64, 64); font-family: arial, sans-serif; font-size: 12px; background-color: rgb(255, 255, 255);\"\u003eThis super quality dual element lens system features fully anti-reflection coating on all air-glass surfaces for increased contrast.\u003c\/p\u003e\u003cp style=\"box-sizing: border-box; -webkit-font-smoothing: subpixel-antialiased; margin: 1em 0px; line-height: 18px; color: rgb(64, 64, 64); font-family: arial, sans-serif; font-size: 12px; background-color: rgb(255, 255, 255);\"\u003eThe exact degree of focal reduction achieved with any given set-up depends somewhat on the precise position of the FR relative to the imaging chip in the case of CCD cameras and the optics when used with eyepieces. Thus the judicious use of extension tubes and carefully positioned filters can squeeze a great deal of versatility out of these excellent quality observing and imaging aids.\u003c\/p\u003e\u003cp style=\"box-sizing: border-box; -webkit-font-smoothing: subpixel-antialiased; margin: 1em 0px; line-height: 18px; color: rgb(64, 64, 64); font-family: arial, sans-serif; font-size: 12px; background-color: rgb(255, 255, 255);\"\u003eGreat for visual use and an indispensable CCD imaging aid!\u003c\/p\u003e","brand":"Antares","offers":[{"title":"Default Title","offer_id":44012347523183,"sku":"FR1","price":30.89,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/ofr-an-fr1-2__88580.jpg?v=1766547732"},{"product_id":"antares-0-5x-2-focal-reducer","title":"Antares 0.5X 2\" Focal reducer","description":"\u003cp style=\"box-sizing: border-box; -webkit-font-smoothing: subpixel-antialiased; margin: 1em 0px; line-height: 18px; color: rgb(64, 64, 64); font-family: arial, sans-serif; font-size: 12px; background-color: rgb(255, 255, 255);\"\u003eThis superb fully multi-coated double-element focal reducer takes advantage of the latest computer aided design techniques to achieve the highest standards of performance to dramatically increase the field of view (FOV) or imaging scale of your telescope regardless of brand or type.\u003c\/p\u003e\u003cp style=\"box-sizing: border-box; -webkit-font-smoothing: subpixel-antialiased; margin: 1em 0px; line-height: 18px; color: rgb(64, 64, 64); font-family: arial, sans-serif; font-size: 12px; background-color: rgb(255, 255, 255);\"\u003eThe Antares 2 inch 0.5x focal reducer screws directly to the 2 inch filter threads found on eyepieces, camera nose-pieces, extension tubes, star diagonals etc.\u003c\/p\u003e\u003cp style=\"box-sizing: border-box; -webkit-font-smoothing: subpixel-antialiased; margin: 1em 0px; line-height: 18px; color: rgb(64, 64, 64); font-family: arial, sans-serif; font-size: 12px; background-color: rgb(255, 255, 255);\"\u003eThe sheer versatility and performance of this new focal reducer can not be over emphasized! It fits virtually every 2 inch accessory (with filter thread) and effectively halves the focal length of any telescope it is used with (the exact effect of the reducer is dependent on its position in the optical system but an approximate halving of the focal length is typical of the result achieved when used with eyepieces and camera nose-pieces etc).\u003c\/p\u003e\u003cp style=\"box-sizing: border-box; -webkit-font-smoothing: subpixel-antialiased; margin: 1em 0px; line-height: 18px; color: rgb(64, 64, 64); font-family: arial, sans-serif; font-size: 12px; background-color: rgb(255, 255, 255);\"\u003eMade in Canada, this excellent optic has a CNC machined aluminium cell with a male 2 inch filter thread.\u003c\/p\u003e","brand":"Antares","offers":[{"title":"Default Title","offer_id":44012606881903,"sku":"FR2-.05","price":41.58,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/s-ofr-an-fr2-2__55084.jpg?v=1766548127"},{"product_id":"antares-0-7x-2-focal-reducer","title":"Antares 0.7x 2\" focal reducer","description":"\u003cp data-start=\"156\" data-end=\"448\"\u003eGive your long-focus scope a wider, brighter personality. The Antares 2\" 0.7× reducer threads on like a standard 2\" filter and shortens your telescope’s effective focal length, opening up larger swaths of sky and cutting exposure times—perfect for galaxies, nebulae, and sweeping star fields.\u003c\/p\u003e\n\u003cp data-start=\"450\" data-end=\"472\"\u003e\u003cstrong data-start=\"450\" data-end=\"472\"\u003eWhy you’ll like it\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-start=\"473\" data-end=\"837\"\u003e\n\u003cli data-start=\"473\" data-end=\"571\"\u003e\n\u003cp data-start=\"475\" data-end=\"571\"\u003e\u003cstrong data-start=\"475\" data-end=\"508\"\u003e0.7× class reduction at 66 mm\u003c\/strong\u003e working distance (from the reducer’s rear lens to the sensor).\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"572\" data-end=\"659\"\u003e\n\u003cp data-start=\"574\" data-end=\"659\"\u003e\u003cstrong data-start=\"574\" data-end=\"599\"\u003eTunable field of view\u003c\/strong\u003e: add spacers to increase reduction for even faster imaging.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"660\" data-end=\"762\"\u003e\n\u003cp data-start=\"662\" data-end=\"762\"\u003e\u003cstrong data-start=\"662\" data-end=\"704\"\u003e2\" format with standard filter threads\u003c\/strong\u003e for easy integration with cameras, wheels, and diagonals.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"763\" data-end=\"837\"\u003e\n\u003cp data-start=\"765\" data-end=\"837\"\u003e\u003cstrong data-start=\"765\" data-end=\"808\"\u003eHigh-quality, fully multi-coated optics\u003c\/strong\u003e for crisp, contrasty images.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"839\" data-end=\"842\"\u003e\n\u003ch2 data-start=\"844\" data-end=\"880\"\u003eHow spacing changes the reduction\u003c\/h2\u003e\n\u003cp data-start=\"882\" data-end=\"1149\"\u003eAs you increase the spacing (back focus), the reduction increases (wider field, faster f\/ratio). Use the table below as a practical guide. Values are approximate and based on the common reducer relationship around this class; plate solve to confirm your exact result.\u003c\/p\u003e\n\u003ch3 data-start=\"1151\" data-end=\"1239\"\u003eSpacer → Reduction quick reference (sensor distance measured from reducer to sensor)\u003c\/h3\u003e\n\u003cdiv class=\"_tableContainer_1rjym_1\"\u003e\n\u003cdiv class=\"group _tableWrapper_1rjym_13 flex w-fit flex-col-reverse\" tabindex=\"-1\"\u003e\n\u003ctable class=\"w-fit min-w-(--thread-content-width)\" data-start=\"1241\" data-end=\"1515\"\u003e\n\u003cthead data-start=\"1241\" data-end=\"1319\"\u003e\n\u003ctr data-start=\"1241\" data-end=\"1319\"\u003e\n\u003cth data-start=\"1241\" data-end=\"1265\" data-col-size=\"sm\"\u003eAdded Spacer vs 66 mm\u003c\/th\u003e\n\u003cth data-start=\"1265\" data-end=\"1283\" data-col-size=\"sm\"\u003eBack Focus (mm)\u003c\/th\u003e\n\u003cth data-start=\"1283\" data-end=\"1303\" data-col-size=\"sm\"\u003eApprox. Reduction\u003c\/th\u003e\n\u003cth data-start=\"1303\" data-end=\"1319\" data-col-size=\"sm\"\u003ef\/10 Becomes\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody data-start=\"1342\" data-end=\"1515\"\u003e\n\u003ctr data-start=\"1342\" data-end=\"1373\"\u003e\n\u003ctd data-start=\"1342\" data-end=\"1350\" data-col-size=\"sm\"\u003e+0 mm\u003c\/td\u003e\n\u003ctd data-start=\"1350\" data-end=\"1355\" data-col-size=\"sm\"\u003e66\u003c\/td\u003e\n\u003ctd data-start=\"1355\" data-end=\"1364\" data-col-size=\"sm\"\u003e~0.70×\u003c\/td\u003e\n\u003ctd data-start=\"1364\" data-end=\"1373\" data-col-size=\"sm\"\u003ef\/7.0\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"1374\" data-end=\"1405\"\u003e\n\u003ctd data-start=\"1374\" data-end=\"1382\" data-col-size=\"sm\"\u003e+5 mm\u003c\/td\u003e\n\u003ctd data-start=\"1382\" data-end=\"1387\" data-col-size=\"sm\"\u003e71\u003c\/td\u003e\n\u003ctd data-start=\"1387\" data-end=\"1396\" data-col-size=\"sm\"\u003e~0.68×\u003c\/td\u003e\n\u003ctd data-start=\"1396\" data-end=\"1405\" data-col-size=\"sm\"\u003ef\/6.8\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"1406\" data-end=\"1438\"\u003e\n\u003ctd data-start=\"1406\" data-end=\"1415\" data-col-size=\"sm\"\u003e+10 mm\u003c\/td\u003e\n\u003ctd data-start=\"1415\" data-end=\"1420\" data-col-size=\"sm\"\u003e76\u003c\/td\u003e\n\u003ctd data-start=\"1420\" data-end=\"1429\" data-col-size=\"sm\"\u003e~0.66×\u003c\/td\u003e\n\u003ctd data-start=\"1429\" data-end=\"1438\" data-col-size=\"sm\"\u003ef\/6.6\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"1439\" data-end=\"1471\"\u003e\n\u003ctd data-start=\"1439\" data-end=\"1448\" data-col-size=\"sm\"\u003e+15 mm\u003c\/td\u003e\n\u003ctd data-start=\"1448\" data-end=\"1453\" data-col-size=\"sm\"\u003e81\u003c\/td\u003e\n\u003ctd data-start=\"1453\" data-end=\"1462\" data-col-size=\"sm\"\u003e~0.64×\u003c\/td\u003e\n\u003ctd data-start=\"1462\" data-end=\"1471\" data-col-size=\"sm\"\u003ef\/6.4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"1472\" data-end=\"1515\"\u003e\n\u003ctd data-start=\"1472\" data-end=\"1481\" data-col-size=\"sm\"\u003e+20 mm\u003c\/td\u003e\n\u003ctd data-start=\"1481\" data-end=\"1486\" data-col-size=\"sm\"\u003e86\u003c\/td\u003e\n\u003ctd data-start=\"1486\" data-end=\"1500\" data-col-size=\"sm\"\u003e~0.61–0.62×\u003c\/td\u003e\n\u003ctd data-start=\"1500\" data-end=\"1515\" data-col-size=\"sm\"\u003ef\/6.1–f\/6.2\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp data-start=\"1517\" data-end=\"1525\"\u003e\u003cstrong data-start=\"1517\" data-end=\"1525\"\u003eTips\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-start=\"1526\" data-end=\"1799\"\u003e\n\u003cli data-start=\"1526\" data-end=\"1579\"\u003e\n\u003cp data-start=\"1528\" data-end=\"1579\"\u003eStart at \u003cstrong data-start=\"1537\" data-end=\"1546\"\u003e66 mm\u003c\/strong\u003e for the nominal 0.7× experience.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1580\" data-end=\"1680\"\u003e\n\u003cp data-start=\"1582\" data-end=\"1680\"\u003eAdd spacers in small steps and confirm with a quick plate solve to dial in framing and star shape.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1681\" data-end=\"1799\"\u003e\n\u003cp data-start=\"1683\" data-end=\"1799\"\u003eVery large spacing can push the system too hard and may introduce edge aberrations—balance speed with image quality.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eExamples of FOV when used with some cameras\u003c\/p\u003e\n\u003ch1 data-start=\"711\" data-end=\"740\"\u003eASI294 (4.63 µm, 4144×2822)\u003c\/h1\u003e\n\u003cdiv class=\"_tableContainer_1rjym_1\"\u003e\n\u003cdiv class=\"group _tableWrapper_1rjym_13 flex w-fit flex-col-reverse\" tabindex=\"-1\"\u003e\n\u003ctable class=\"w-fit min-w-(--thread-content-width)\" data-start=\"742\" data-end=\"1151\"\u003e\n\u003cthead data-start=\"742\" data-end=\"839\"\u003e\n\u003ctr data-start=\"742\" data-end=\"839\"\u003e\n\u003cth data-start=\"742\" data-end=\"766\" data-col-size=\"sm\"\u003eAdded Spacer vs 66 mm\u003c\/th\u003e\n\u003cth data-start=\"766\" data-end=\"776\" data-col-size=\"sm\"\u003eBF (mm)\u003c\/th\u003e\n\u003cth data-start=\"776\" data-end=\"792\" data-col-size=\"sm\"\u003eReduction (×)\u003c\/th\u003e\n\u003cth data-start=\"792\" data-end=\"807\" data-col-size=\"sm\"\u003eEff. FL (mm)\u003c\/th\u003e\n\u003cth data-start=\"807\" data-end=\"828\" data-col-size=\"sm\"\u003ePixel Scale (″\/px)\u003c\/th\u003e\n\u003cth data-start=\"828\" data-end=\"839\" data-col-size=\"sm\"\u003eFOV (°)\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody data-start=\"872\" data-end=\"1151\"\u003e\n\u003ctr data-start=\"872\" data-end=\"932\"\u003e\n\u003ctd data-start=\"872\" data-end=\"877\" data-col-size=\"sm\"\u003e+0\u003c\/td\u003e\n\u003ctd data-start=\"877\" data-end=\"882\" data-col-size=\"sm\"\u003e66\u003c\/td\u003e\n\u003ctd data-start=\"882\" data-end=\"893\" data-col-size=\"sm\"\u003e\u003cstrong data-start=\"884\" data-end=\"892\"\u003e0.70\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd data-start=\"893\" data-end=\"899\" data-col-size=\"sm\"\u003e700\u003c\/td\u003e\n\u003ctd data-start=\"899\" data-end=\"911\" data-col-size=\"sm\"\u003e\u003cstrong data-start=\"901\" data-end=\"910\"\u003e1.364\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd data-start=\"911\" data-end=\"932\" data-col-size=\"sm\"\u003e\u003cstrong data-start=\"913\" data-end=\"930\"\u003e1.570 × 1.069\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"933\" data-end=\"983\"\u003e\n\u003ctd data-start=\"933\" data-end=\"938\" data-col-size=\"sm\"\u003e+5\u003c\/td\u003e\n\u003ctd data-start=\"938\" data-end=\"943\" data-col-size=\"sm\"\u003e71\u003c\/td\u003e\n\u003ctd data-start=\"943\" data-end=\"950\" data-col-size=\"sm\"\u003e0.68\u003c\/td\u003e\n\u003ctd data-start=\"950\" data-end=\"958\" data-col-size=\"sm\"\u003e677.3\u003c\/td\u003e\n\u003ctd data-start=\"958\" data-end=\"966\" data-col-size=\"sm\"\u003e1.410\u003c\/td\u003e\n\u003ctd data-start=\"966\" data-end=\"983\" data-col-size=\"sm\"\u003e1.623 × 1.105\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"984\" data-end=\"1035\"\u003e\n\u003ctd data-start=\"984\" data-end=\"990\" data-col-size=\"sm\"\u003e+10\u003c\/td\u003e\n\u003ctd data-start=\"990\" data-end=\"995\" data-col-size=\"sm\"\u003e76\u003c\/td\u003e\n\u003ctd data-start=\"995\" data-end=\"1002\" data-col-size=\"sm\"\u003e0.65\u003c\/td\u003e\n\u003ctd data-start=\"1002\" data-end=\"1010\" data-col-size=\"sm\"\u003e654.5\u003c\/td\u003e\n\u003ctd data-start=\"1010\" data-end=\"1018\" data-col-size=\"sm\"\u003e1.460\u003c\/td\u003e\n\u003ctd data-start=\"1018\" data-end=\"1035\" data-col-size=\"sm\"\u003e1.679 × 1.142\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"1036\" data-end=\"1087\"\u003e\n\u003ctd data-start=\"1036\" data-end=\"1042\" data-col-size=\"sm\"\u003e+15\u003c\/td\u003e\n\u003ctd data-start=\"1042\" data-end=\"1047\" data-col-size=\"sm\"\u003e81\u003c\/td\u003e\n\u003ctd data-start=\"1047\" data-end=\"1054\" data-col-size=\"sm\"\u003e0.63\u003c\/td\u003e\n\u003ctd data-start=\"1054\" data-end=\"1062\" data-col-size=\"sm\"\u003e631.8\u003c\/td\u003e\n\u003ctd data-start=\"1062\" data-end=\"1070\" data-col-size=\"sm\"\u003e1.516\u003c\/td\u003e\n\u003ctd data-start=\"1070\" data-end=\"1087\" data-col-size=\"sm\"\u003e1.740 × 1.184\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"1088\" data-end=\"1151\"\u003e\n\u003ctd data-start=\"1088\" data-end=\"1094\" data-col-size=\"sm\"\u003e+20\u003c\/td\u003e\n\u003ctd data-start=\"1094\" data-end=\"1099\" data-col-size=\"sm\"\u003e86\u003c\/td\u003e\n\u003ctd data-start=\"1099\" data-end=\"1110\" data-col-size=\"sm\"\u003e\u003cstrong data-start=\"1101\" data-end=\"1109\"\u003e0.61\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd data-start=\"1110\" data-end=\"1118\" data-col-size=\"sm\"\u003e609.1\u003c\/td\u003e\n\u003ctd data-start=\"1118\" data-end=\"1130\" data-col-size=\"sm\"\u003e\u003cstrong data-start=\"1120\" data-end=\"1129\"\u003e1.572\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd data-start=\"1130\" data-end=\"1151\" data-col-size=\"sm\"\u003e\u003cstrong data-start=\"1132\" data-end=\"1149\"\u003e1.802 × 1.227\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003chr data-start=\"1153\" data-end=\"1156\"\u003e\n\u003ch1 data-start=\"1158\" data-end=\"1187\"\u003eASI533 (3.76 µm, 3008×3008)\u003c\/h1\u003e\n\u003cdiv class=\"_tableContainer_1rjym_1\"\u003e\n\u003cdiv class=\"group _tableWrapper_1rjym_13 flex w-fit flex-col-reverse\" tabindex=\"-1\"\u003e\n\u003ctable class=\"w-fit min-w-(--thread-content-width)\" data-start=\"1189\" data-end=\"1598\"\u003e\n\u003cthead data-start=\"1189\" data-end=\"1286\"\u003e\n\u003ctr data-start=\"1189\" data-end=\"1286\"\u003e\n\u003cth data-start=\"1189\" data-end=\"1213\" data-col-size=\"sm\"\u003eAdded Spacer vs 66 mm\u003c\/th\u003e\n\u003cth data-start=\"1213\" data-end=\"1223\" data-col-size=\"sm\"\u003eBF (mm)\u003c\/th\u003e\n\u003cth data-start=\"1223\" data-end=\"1239\" data-col-size=\"sm\"\u003eReduction (×)\u003c\/th\u003e\n\u003cth data-start=\"1239\" data-end=\"1254\" data-col-size=\"sm\"\u003eEff. FL (mm)\u003c\/th\u003e\n\u003cth data-start=\"1254\" data-end=\"1275\" data-col-size=\"sm\"\u003ePixel Scale (″\/px)\u003c\/th\u003e\n\u003cth data-start=\"1275\" data-end=\"1286\" data-col-size=\"sm\"\u003eFOV (°)\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody data-start=\"1319\" data-end=\"1598\"\u003e\n\u003ctr data-start=\"1319\" data-end=\"1379\"\u003e\n\u003ctd data-start=\"1319\" data-end=\"1324\" data-col-size=\"sm\"\u003e+0\u003c\/td\u003e\n\u003ctd data-start=\"1324\" data-end=\"1329\" data-col-size=\"sm\"\u003e66\u003c\/td\u003e\n\u003ctd data-start=\"1329\" data-end=\"1340\" data-col-size=\"sm\"\u003e\u003cstrong data-start=\"1331\" data-end=\"1339\"\u003e0.70\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd data-start=\"1340\" data-end=\"1346\" data-col-size=\"sm\"\u003e700\u003c\/td\u003e\n\u003ctd data-start=\"1346\" data-end=\"1358\" data-col-size=\"sm\"\u003e\u003cstrong data-start=\"1348\" data-end=\"1357\"\u003e1.109\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd data-start=\"1358\" data-end=\"1379\" data-col-size=\"sm\"\u003e\u003cstrong data-start=\"1360\" data-end=\"1377\"\u003e0.927 × 0.927\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"1380\" data-end=\"1430\"\u003e\n\u003ctd data-start=\"1380\" data-end=\"1385\" data-col-size=\"sm\"\u003e+5\u003c\/td\u003e\n\u003ctd data-start=\"1385\" data-end=\"1390\" data-col-size=\"sm\"\u003e71\u003c\/td\u003e\n\u003ctd data-start=\"1390\" data-end=\"1397\" data-col-size=\"sm\"\u003e0.68\u003c\/td\u003e\n\u003ctd data-start=\"1397\" data-end=\"1405\" data-col-size=\"sm\"\u003e677.3\u003c\/td\u003e\n\u003ctd data-start=\"1405\" data-end=\"1413\" data-col-size=\"sm\"\u003e1.147\u003c\/td\u003e\n\u003ctd data-start=\"1413\" data-end=\"1430\" data-col-size=\"sm\"\u003e0.958 × 0.958\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"1431\" data-end=\"1482\"\u003e\n\u003ctd data-start=\"1431\" data-end=\"1437\" data-col-size=\"sm\"\u003e+10\u003c\/td\u003e\n\u003ctd data-start=\"1437\" data-end=\"1442\" data-col-size=\"sm\"\u003e76\u003c\/td\u003e\n\u003ctd data-start=\"1442\" data-end=\"1449\" data-col-size=\"sm\"\u003e0.65\u003c\/td\u003e\n\u003ctd data-start=\"1449\" data-end=\"1457\" data-col-size=\"sm\"\u003e654.5\u003c\/td\u003e\n\u003ctd data-start=\"1457\" data-end=\"1465\" data-col-size=\"sm\"\u003e1.186\u003c\/td\u003e\n\u003ctd data-start=\"1465\" data-end=\"1482\" data-col-size=\"sm\"\u003e0.991 × 0.991\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"1483\" data-end=\"1534\"\u003e\n\u003ctd data-start=\"1483\" data-end=\"1489\" data-col-size=\"sm\"\u003e+15\u003c\/td\u003e\n\u003ctd data-start=\"1489\" data-end=\"1494\" data-col-size=\"sm\"\u003e81\u003c\/td\u003e\n\u003ctd data-start=\"1494\" data-end=\"1501\" data-col-size=\"sm\"\u003e0.63\u003c\/td\u003e\n\u003ctd data-start=\"1501\" data-end=\"1509\" data-col-size=\"sm\"\u003e631.8\u003c\/td\u003e\n\u003ctd data-start=\"1509\" data-end=\"1517\" data-col-size=\"sm\"\u003e1.228\u003c\/td\u003e\n\u003ctd data-start=\"1517\" data-end=\"1534\" data-col-size=\"sm\"\u003e1.025 × 1.025\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"1535\" data-end=\"1598\"\u003e\n\u003ctd data-start=\"1535\" data-end=\"1541\" data-col-size=\"sm\"\u003e+20\u003c\/td\u003e\n\u003ctd data-start=\"1541\" data-end=\"1546\" data-col-size=\"sm\"\u003e86\u003c\/td\u003e\n\u003ctd data-start=\"1546\" data-end=\"1557\" data-col-size=\"sm\"\u003e\u003cstrong data-start=\"1548\" data-end=\"1556\"\u003e0.61\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd data-start=\"1557\" data-end=\"1565\" data-col-size=\"sm\"\u003e609.1\u003c\/td\u003e\n\u003ctd data-start=\"1565\" data-end=\"1577\" data-col-size=\"sm\"\u003e\u003cstrong data-start=\"1567\" data-end=\"1576\"\u003e1.273\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd data-start=\"1577\" data-end=\"1598\" data-col-size=\"sm\"\u003e\u003cstrong data-start=\"1579\" data-end=\"1596\"\u003e1.063 × 1.063\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003chr data-start=\"1600\" data-end=\"1603\"\u003e\n\u003ch1 data-start=\"1605\" data-end=\"1634\"\u003eASI585 (2.90 µm, 3840×2160)\u003c\/h1\u003e\n\u003cdiv class=\"_tableContainer_1rjym_1\"\u003e\n\u003cdiv class=\"group _tableWrapper_1rjym_13 flex w-fit flex-col-reverse\" tabindex=\"-1\"\u003e\n\u003ctable class=\"w-fit min-w-(--thread-content-width)\" data-start=\"1636\" data-end=\"2045\"\u003e\n\u003cthead data-start=\"1636\" data-end=\"1733\"\u003e\n\u003ctr data-start=\"1636\" data-end=\"1733\"\u003e\n\u003cth data-start=\"1636\" data-end=\"1660\" data-col-size=\"sm\"\u003eAdded Spacer vs 66 mm\u003c\/th\u003e\n\u003cth data-start=\"1660\" data-end=\"1670\" data-col-size=\"sm\"\u003eBF (mm)\u003c\/th\u003e\n\u003cth data-start=\"1670\" data-end=\"1686\" data-col-size=\"sm\"\u003eReduction (×)\u003c\/th\u003e\n\u003cth data-start=\"1686\" data-end=\"1701\" data-col-size=\"sm\"\u003eEff. FL (mm)\u003c\/th\u003e\n\u003cth data-start=\"1701\" data-end=\"1722\" data-col-size=\"sm\"\u003ePixel Scale (″\/px)\u003c\/th\u003e\n\u003cth data-start=\"1722\" data-end=\"1733\" data-col-size=\"sm\"\u003eFOV (°)\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody data-start=\"1766\" data-end=\"2045\"\u003e\n\u003ctr data-start=\"1766\" data-end=\"1826\"\u003e\n\u003ctd data-start=\"1766\" data-end=\"1771\" data-col-size=\"sm\"\u003e+0\u003c\/td\u003e\n\u003ctd data-start=\"1771\" data-end=\"1776\" data-col-size=\"sm\"\u003e66\u003c\/td\u003e\n\u003ctd data-start=\"1776\" data-end=\"1787\" data-col-size=\"sm\"\u003e\u003cstrong data-start=\"1778\" data-end=\"1786\"\u003e0.70\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd data-start=\"1787\" data-end=\"1793\" data-col-size=\"sm\"\u003e700\u003c\/td\u003e\n\u003ctd data-start=\"1793\" data-end=\"1805\" data-col-size=\"sm\"\u003e\u003cstrong data-start=\"1795\" data-end=\"1804\"\u003e0.854\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd data-start=\"1805\" data-end=\"1826\" data-col-size=\"sm\"\u003e\u003cstrong data-start=\"1807\" data-end=\"1824\"\u003e0.912 × 0.513\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"1827\" data-end=\"1877\"\u003e\n\u003ctd data-start=\"1827\" data-end=\"1832\" data-col-size=\"sm\"\u003e+5\u003c\/td\u003e\n\u003ctd data-start=\"1832\" data-end=\"1837\" data-col-size=\"sm\"\u003e71\u003c\/td\u003e\n\u003ctd data-start=\"1837\" data-end=\"1844\" data-col-size=\"sm\"\u003e0.68\u003c\/td\u003e\n\u003ctd data-start=\"1844\" data-end=\"1852\" data-col-size=\"sm\"\u003e677.3\u003c\/td\u003e\n\u003ctd data-start=\"1852\" data-end=\"1860\" data-col-size=\"sm\"\u003e0.883\u003c\/td\u003e\n\u003ctd data-start=\"1860\" data-end=\"1877\" data-col-size=\"sm\"\u003e0.943 × 0.531\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"1878\" data-end=\"1929\"\u003e\n\u003ctd data-start=\"1878\" data-end=\"1884\" data-col-size=\"sm\"\u003e+10\u003c\/td\u003e\n\u003ctd data-start=\"1884\" data-end=\"1889\" data-col-size=\"sm\"\u003e76\u003c\/td\u003e\n\u003ctd data-start=\"1889\" data-end=\"1896\" data-col-size=\"sm\"\u003e0.65\u003c\/td\u003e\n\u003ctd data-start=\"1896\" data-end=\"1904\" data-col-size=\"sm\"\u003e654.5\u003c\/td\u003e\n\u003ctd data-start=\"1904\" data-end=\"1912\" data-col-size=\"sm\"\u003e0.914\u003c\/td\u003e\n\u003ctd data-start=\"1912\" data-end=\"1929\" data-col-size=\"sm\"\u003e0.977 × 0.550\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"1930\" data-end=\"1981\"\u003e\n\u003ctd data-start=\"1930\" data-end=\"1936\" data-col-size=\"sm\"\u003e+15\u003c\/td\u003e\n\u003ctd data-start=\"1936\" data-end=\"1941\" data-col-size=\"sm\"\u003e81\u003c\/td\u003e\n\u003ctd data-start=\"1941\" data-end=\"1948\" data-col-size=\"sm\"\u003e0.63\u003c\/td\u003e\n\u003ctd data-start=\"1948\" data-end=\"1956\" data-col-size=\"sm\"\u003e631.8\u003c\/td\u003e\n\u003ctd data-start=\"1956\" data-end=\"1964\" data-col-size=\"sm\"\u003e0.946\u003c\/td\u003e\n\u003ctd data-start=\"1964\" data-end=\"1981\" data-col-size=\"sm\"\u003e1.010 × 0.568\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"1982\" data-end=\"2045\"\u003e\n\u003ctd data-start=\"1982\" data-end=\"1988\" data-col-size=\"sm\"\u003e+20\u003c\/td\u003e\n\u003ctd data-start=\"1988\" data-end=\"1993\" data-col-size=\"sm\"\u003e86\u003c\/td\u003e\n\u003ctd data-start=\"1993\" data-end=\"2004\" data-col-size=\"sm\"\u003e\u003cstrong data-start=\"1995\" data-end=\"2003\"\u003e0.61\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd data-start=\"2004\" data-end=\"2012\" data-col-size=\"sm\"\u003e609.1\u003c\/td\u003e\n\u003ctd data-start=\"2012\" data-end=\"2024\" data-col-size=\"sm\"\u003e\u003cstrong data-start=\"2014\" data-end=\"2023\"\u003e0.982\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd data-start=\"2024\" data-end=\"2045\" data-col-size=\"sm\"\u003e\u003cstrong data-start=\"2026\" data-end=\"2043\"\u003e1.048 × 0.589\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Antares","offers":[{"title":"Default Title","offer_id":44013155713135,"sku":"FR2-0.7","price":106.92,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/antares-fr2-0-07x-reducer-1000__85948.jpg?v=1766548677"},{"product_id":"edgehd-1100-7x-focal-reducer-lens","title":"EdgeHD 1100 .7x Focal Reducer Lens","description":"\u003ch1\u003e\u003cspan style=\"font-family:\" arial new roman\u003eOverview\u003co:p\u003e\u003c\/o:p\u003e\u003c\/span\u003e\u003c\/h1\u003e  \u003cul type=\"disc\"\u003e  \u003cli class=\"MsoNormal\"\u003e\u003cspan style=\"font-family:      \" arial new roman\u003eThe EdgeHD      .7x Focal Reducer Lens Makes Your EdgeHD 1100 One Full F-Stop Faster Than      f\/10, Reducing Your Exposure Time by One-Half to Capture the Same      Brightness of Object\u003co:p\u003e\u003c\/o:p\u003e\u003c\/span\u003e\u003c\/li\u003e  \u003cli class=\"MsoNormal\"\u003e\u003cspan style=\"font-family:      \" arial new roman\u003e5-element      lens design\u003co:p\u003e\u003c\/o:p\u003e\u003c\/span\u003e\u003c\/li\u003e  \u003cli class=\"MsoNormal\"\u003e\u003cspan style=\"font-family:      \" arial new roman\u003eMaintains      similar flat-field performance as native Edge HD optical design\u003co:p\u003e\u003c\/o:p\u003e\u003c\/span\u003e\u003c\/li\u003e  \u003cli class=\"MsoNormal\"\u003e\u003cspan style=\"font-family:      \" arial new roman\u003eIncreases      Field of View by 43% to Better Capture Wide Field Images\u003co:p\u003e\u003c\/o:p\u003e\u003c\/span\u003e\u003c\/li\u003e  \u003cli class=\"MsoNormal\"\u003e\u003cspan style=\"font-family:      \" arial new roman\u003eThreads      Directly onto the 3.25\" threads of the EdgeHD which Reduces      Mechanical Vignetting and Allows for use with Larger (Full Frame) Sensors      and Off-Axis Guiders\u003co:p\u003e\u003c\/o:p\u003e\u003c\/span\u003e\u003c\/li\u003e  \u003cli class=\"MsoNormal\"\u003e\u003cspan style=\"font-family:      \" arial new roman\u003eMaintains      the Identical Back Focus When Used at F\/10 and Provides Generous Back      Focus to Accommodate Additional Accessories and Wide Variety of Cameras\u003co:p\u003e\u003c\/o:p\u003e\u003c\/span\u003e\u003c\/li\u003e  \u003cli class=\"MsoNormal\"\u003e\u003cspan style=\"font-family:      \" arial new roman\u003eAllows Use      of Existing EdgeHD T-adapters With or Without the Reducer Lens\u003co:p\u003e\u003c\/o:p\u003e\u003c\/span\u003e\u003c\/li\u003e \u003c\/ul\u003e  \u003ch1\u003e\u003cspan style=\"font-family:\" arial new roman\u003eDescription\u003co:p\u003e\u003c\/o:p\u003e\u003c\/span\u003e\u003c\/h1\u003e  \u003cp\u003e\u003cspan style=\"font-family:\" arial\u003eCelestron s new EdgeHD reducers feature a custom 5 element optical design engineered to maintain the flat-field performance of our award winning EdgeHD optical system.  Unlike generic reducers, our premium reducers provide substantial back focus to accommodate an assortment of imaging accessories.\u003co:p\u003e\u003c\/o:p\u003e\u003c\/span\u003e\u003c\/p\u003e  \u003cp\u003e\u003cspan style=\"font-family:\" arial\u003eEdgeHD reducers offer high index optical elements, including extra low dispersion, exotic Lanthanum elements, which provide high contrast viewing while minimizing chromatic aberration.  All air to glass lens surfaces feature multiple layers of coating for maximum light transmission and color correction and contain blacken edges to minimize internal reflection and maximize image contrast.  Large diameter lens elements, up to 60 mm clear aperture, ensure that the optimized image circle remains at a generous 42 mm for use with large CCD sensors. \u003co:p\u003e\u003c\/o:p\u003e\u003c\/span\u003e\u003c\/p\u003e  \u003cp\u003e\u003cspan style=\"font-family:\" arial\u003eIncorporating computer assisted CNC machined aluminum housing, for precise spacing and alignment of optical elements, and threaded metal covers on the lens assembly to protect your investment from dust and scratches, our reducers offer you an outstanding mechanical design.\u003co:p\u003e\u003c\/o:p\u003e\u003c\/span\u003e\u003c\/p\u003e  \u003cp\u003e\u003cspan style=\"font-family:\" arial\u003eWith the fastar option on all EdgeHD optical systems, coupled with the .7x reducer, your telescope becomes the most complete imaging system available in its price range today.\u003co:p\u003e\u003c\/o:p\u003e\u003c\/span\u003e\u003c\/p\u003e  \u003ch3\u003e\u003cspan style=\"font-family:\" arial new roman\u003ePerformance\u003co:p\u003e\u003c\/o:p\u003e\u003c\/span\u003e\u003c\/h3\u003e  \u003cul type=\"disc\"\u003e  \u003cli class=\"MsoNormal\"\u003e\n\u003cstrong\u003e\u003cspan style=\"font-family:\" arial new roman\u003eDesign:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan style=\"font-family:\" arial new roman\u003e      5-element optical layout designed specifically for the EdgeHD11\" to      maintain the flat-field performance of the Edge HD optical design\u003co:p\u003e\u003c\/o:p\u003e\u003c\/span\u003e\n\u003c\/li\u003e  \u003cli class=\"MsoNormal\"\u003e\n\u003cstrong\u003e\u003cspan style=\"font-family:\" arial new roman\u003eMaintains      the same back focus as when used at F\/10:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan style=\"font-family:\" arial new roman\u003e      Unlike generic reducers the EdgeHD .7x provides generous back focus to      accommodate additional accessories and a wide variety of cameras. Also      allows use of existing EdgeHD T-adapters and other Celestron imaging      accessories\u003co:p\u003e\u003c\/o:p\u003e\u003c\/span\u003e\n\u003c\/li\u003e  \u003cli class=\"MsoNormal\"\u003e\n\u003cstrong\u003e\u003cspan style=\"font-family:\" arial new roman\u003eOne      full F-Stop faster than f\/10:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan style=\"font-family:      \" arial new roman\u003e Reduces the      exposure time by one-half to capture the same brightness of object\u003co:p\u003e\u003c\/o:p\u003e\u003c\/span\u003e\n\u003c\/li\u003e  \u003cli class=\"MsoNormal\"\u003e\n\u003cstrong\u003e\u003cspan style=\"font-family:\" arial new roman\u003e Increase      field of view by 43%: \u003c\/span\u003e\u003c\/strong\u003e\u003cspan style=\"font-family:\" arial mso-fareast-font-family: new roman\u003eBetter for capturing wide field      images of larger galaxies and nebulae\u003co:p\u003e\u003c\/o:p\u003e\u003c\/span\u003e\n\u003c\/li\u003e \u003c\/ul\u003e  \u003ch3\u003e\u003cspan style=\"font-family:\" arial new roman\u003eGlass\u003co:p\u003e\u003c\/o:p\u003e\u003c\/span\u003e\u003c\/h3\u003e  \u003cul type=\"disc\"\u003e  \u003cli class=\"MsoNormal\"\u003e\n\u003cstrong\u003e\u003cspan style=\"font-family:\" arial new roman\u003eLanthanum      Glass Elements: \u003c\/span\u003e\u003c\/strong\u003e\u003cspan style=\"font-family:\" arial mso-fareast-font-family: new roman\u003eEdgeHD reducer uses \"rare      earth\" Lanthanum glass elements for clear, high contrast viewing      while minimizing chromatic aberration\u003co:p\u003e\u003c\/o:p\u003e\u003c\/span\u003e\n\u003c\/li\u003e  \u003cli class=\"MsoNormal\"\u003e\n\u003cstrong\u003e\u003cspan style=\"font-family:\" arial new roman\u003eFully      multi-coated lens elements:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan style=\"font-family:\" arial mso-fareast-font-family: new roman\u003e All air-to-glass surfaces have      multiple layers of coating for maximum light transmission and color      correction\u003co:p\u003e\u003c\/o:p\u003e\u003c\/span\u003e\n\u003c\/li\u003e  \u003cli class=\"MsoNormal\"\u003e\n\u003cstrong\u003e\u003cspan style=\"font-family:\" arial new roman\u003eBlacken      edges:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan style=\"font-family:\" arial mso-fareast-font-family: new roman\u003e All lens elements have blacken      edges to minimize internal reflection and maximize contrast\u003co:p\u003e\u003c\/o:p\u003e\u003c\/span\u003e\n\u003c\/li\u003e \u003c\/ul\u003e  \u003ch3\u003e\u003cspan style=\"font-family:\" arial new roman\u003eFull Frame Design\u003co:p\u003e\u003c\/o:p\u003e\u003c\/span\u003e\u003c\/h3\u003e  \u003cul type=\"disc\"\u003e  \u003cli class=\"MsoNormal\"\u003e\n\u003cstrong\u003e\u003cspan style=\"font-family:\" arial new roman\u003eThreads      directly onto the 3.25\" threads of the EdgeHD optical tube: \u003c\/span\u003e\u003c\/strong\u003e\u003cspan style=\"font-family:\" arial new roman\u003eReduces      mechanical vignetting and allows for use with larger (full frame) sensors      and Off-Axis Guiders\u003co:p\u003e\u003c\/o:p\u003e\u003c\/span\u003e\n\u003c\/li\u003e  \u003cli class=\"MsoNormal\"\u003e\n\u003cstrong\u003e\u003cspan style=\"font-family:\" arial new roman\u003eClear      aperture: \u003c\/span\u003e\u003c\/strong\u003e\u003cspan style=\"font-family:\" arial mso-fareast-font-family: new roman\u003e60mm clear aperture lens      optimized for a 42 mm image circle for use with large CCD sensors.\u003co:p\u003e\u003c\/o:p\u003e\u003c\/span\u003e\n\u003c\/li\u003e \u003c\/ul\u003e  \u003ch3\u003e\u003cspan style=\"font-family:\" arial new roman\u003eMechanical Design\u003co:p\u003e\u003c\/o:p\u003e\u003c\/span\u003e\u003c\/h3\u003e  \u003cul type=\"disc\"\u003e  \u003cli class=\"MsoNormal\"\u003e\n\u003cstrong\u003e\u003cspan style=\"font-family:\" arial new roman\u003eMachined      aluminum housing: \u003c\/span\u003e\u003c\/strong\u003e\u003cspan style=\"font-family:\" arial mso-fareast-font-family: new roman\u003eComputer assisted CNC machined      aluminum housing for precise spacing and alignment of the optical      elements.\u003co:p\u003e\u003c\/o:p\u003e\u003c\/span\u003e\n\u003c\/li\u003e  \u003cli class=\"MsoNormal\"\u003e\n\u003cstrong\u003e\u003cspan style=\"font-family:\" arial new roman\u003eThreaded      metal covers for both ends of the lens assembly: \u003c\/span\u003e\u003c\/strong\u003e\u003cspan style=\"font-family:\" arial new roman\u003eTo      protect your investment from unwanted dust and scratches.\u003co:p\u003e\u003c\/o:p\u003e\u003c\/span\u003e\n\u003c\/li\u003e \u003c\/ul\u003e  \u003ch3\u003e\u003cspan style=\"font-family:\" arial new roman\u003eVersatility\u003co:p\u003e\u003c\/o:p\u003e\u003c\/span\u003e\u003c\/h3\u003e  \u003cul type=\"disc\"\u003e  \u003cli class=\"MsoNormal\" style=\"mso-margin-top-alt:auto;margin-bottom:12.0pt;      mso-list:l2 level1 lfo6;tab-stops:list .5in\"\u003e\n\u003cstrong\u003e\u003cspan style=\"font-family:\" arial new roman\u003eFastar      compatibility and f\/2 imaging with optional accessory: \u003c\/span\u003e\u003c\/strong\u003e\u003cspan style=\"font-family:\" arial new roman\u003ethe      EdgeHD is the most complete imaging system in its price range.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Celestron","offers":[{"title":"Default Title","offer_id":44013376110703,"sku":"94241","price":1180.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/94241_252520Reducer_252520Lens_2525201100_01__18183.1682640057.1280.1280.jpg?v=1766552122"},{"product_id":"reducer-lens-7x-edgehd-925","title":"REDUCER LENS .7X - EDGEHD 925","description":"\u003cp class=\"MsoNormal\" style=\"margin-bottom:11.25pt;line-height:normal\"\u003e\u003cspan style=\"font-size: 10.5pt; font-family: Arial, sans-serif;\"\u003eCelestron’s new EdgeHD reducers feature a custom 4-element optical design engineered to maintain the flat-field performance of our award winning EdgeHD optical system. Unlike generic reducers, our premium reducers provide substantial back focus to accommodate an assortment of imaging accessories.\u003co:p\u003e\u003c\/o:p\u003e\u003c\/span\u003e\u003c\/p\u003e  \u003cp class=\"MsoNormal\" style=\"margin-bottom:11.25pt;line-height:normal\"\u003e\u003cspan style=\"font-size: 10.5pt; font-family: Arial, sans-serif;\"\u003eEdgeHD reducers offer high index optical elements, including extra low dispersion, exotic Lanthanum elements, which provide high contrast viewing while minimizing chromatic aberration. All air to glass lens surfaces feature multiple layers of coating for maximum light transmission and color correction and contain blacken edges to minimize internal reflection and maximize image contrast. Large diameter lens elements, up to 60 mm clear aperture, ensure that the optimized image circle remains at a generous 42 mm for use with large CCD sensors.\u003co:p\u003e\u003c\/o:p\u003e\u003c\/span\u003e\u003c\/p\u003e  \u003cp class=\"MsoNormal\" style=\"margin-bottom:11.25pt;line-height:normal\"\u003e\u003cspan style=\"font-size: 10.5pt; font-family: Arial, sans-serif;\"\u003eIncorporating computer assisted CNC machined aluminum housing, for precise spacing and alignment of optical elements, and threaded metal covers on the lens assembly to protect your investment from dust and scratches, our reducers offer you an outstanding mechanical design.\u003co:p\u003e\u003c\/o:p\u003e\u003c\/span\u003e\u003c\/p\u003e  \u003cp class=\"MsoNormal\" style=\"margin-bottom:11.25pt;line-height:normal\"\u003e\u003cspan style=\"font-size: 10.5pt; font-family: Arial, sans-serif;\"\u003eWith the fastar option on all EdgeHD optical systems, coupled with the .7x reducer, your telescope becomes the most complete imaging system available in its price range today.\u003co:p\u003e\u003c\/o:p\u003e\u003c\/span\u003e\u003c\/p\u003e  \u003cp class=\"MsoNormal\" style=\"margin-top:11.25pt;margin-right:0in;margin-bottom: 6.0pt;margin-left:0in;line-height:normal;mso-outline-level:3\"\u003e\u003cspan style=\"font-size: 13.5pt; font-family: Arial, sans-serif; font-weight: bold;\"\u003ePerformance\u003co:p\u003e\u003c\/o:p\u003e\u003c\/span\u003e\u003c\/p\u003e  \u003cp class=\"MsoNormal\" style=\"mso-margin-top-alt:auto;margin-bottom:3.75pt; margin-left:0in;text-indent:-.25in;line-height:normal;mso-list:l1 level1 lfo1; tab-stops:list .5in\"\u003e\u003c!--[if !supportLists]--\u003e\u003cspan style=\"font-size: 10pt; font-family: Symbol;\"\u003e\u003cspan style=\"mso-list:Ignore\"\u003e·\u003cspan style=\"font:7.0pt \" times new roman\u003e         \u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c!--[endif]--\u003e\u003cspan style=\"font-size: 10.5pt; font-family: Arial, sans-serif; font-weight: bold;\"\u003eDesign:\u003c\/span\u003e\u003cspan style=\"font-size: 10.5pt; font-family: Arial, sans-serif;\"\u003e 4-element optical layout designed specifically for the \u003ca href=\"https:\/\/www.celestron.com\/products\/edgehd-925-optical-tube-assembly\"\u003eEdgeHD 9.25\"\u003c\/a\u003e to maintain the flat-field performance of the EdgeHD optical design\u003co:p\u003e\u003c\/o:p\u003e\u003c\/span\u003e\u003c\/p\u003e  \u003cp class=\"MsoNormal\" style=\"mso-margin-top-alt:auto;margin-bottom:3.75pt; margin-left:0in;text-indent:-.25in;line-height:normal;mso-list:l1 level1 lfo1; tab-stops:list .5in\"\u003e\u003c!--[if !supportLists]--\u003e\u003cspan style=\"font-size: 10pt; font-family: Symbol;\"\u003e\u003cspan style=\"mso-list:Ignore\"\u003e·\u003cspan style=\"font:7.0pt \" times new roman\u003e         \u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c!--[endif]--\u003e\u003cspan style=\"font-size: 10.5pt; font-family: Arial, sans-serif; font-weight: bold;\"\u003eMaintains the same back focus as when used at f\/10:\u003c\/span\u003e\u003cspan style=\"font-size: 10.5pt; font-family: Arial, sans-serif;\"\u003e Unlike generic reducers the EdgeHD .7x provides generous back focus to accommodate additional accessories and a wide variety of cameras. Also allows use of existing EdgeHD T-Adapters and other Celestron imaging accessories\u003co:p\u003e\u003c\/o:p\u003e\u003c\/span\u003e\u003c\/p\u003e  \u003cp class=\"MsoNormal\" style=\"mso-margin-top-alt:auto;margin-bottom:3.75pt; margin-left:0in;text-indent:-.25in;line-height:normal;mso-list:l1 level1 lfo1; tab-stops:list .5in\"\u003e\u003c!--[if !supportLists]--\u003e\u003cspan style=\"font-size: 10pt; font-family: Symbol;\"\u003e\u003cspan style=\"mso-list:Ignore\"\u003e·\u003cspan style=\"font:7.0pt \" times new roman\u003e         \u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c!--[endif]--\u003e\u003cspan style=\"font-size: 10.5pt; font-family: Arial, sans-serif; font-weight: bold;\"\u003eOne full F-Stop faster than f\/10:\u003c\/span\u003e\u003cspan style=\"font-size: 10.5pt; font-family: Arial, sans-serif;\"\u003e Reduces the exposure time by one-half to capture the same brightness of object\u003co:p\u003e\u003c\/o:p\u003e\u003c\/span\u003e\u003c\/p\u003e  \u003cp class=\"MsoNormal\" style=\"mso-margin-top-alt:auto;margin-bottom:3.75pt; margin-left:0in;text-indent:-.25in;line-height:normal;mso-list:l1 level1 lfo1; tab-stops:list .5in\"\u003e\u003c!--[if !supportLists]--\u003e\u003cspan style=\"font-size: 10pt; font-family: Symbol;\"\u003e\u003cspan style=\"mso-list:Ignore\"\u003e·\u003cspan style=\"font:7.0pt \" times new roman\u003e         \u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c!--[endif]--\u003e\u003cspan style=\"font-size: 10.5pt; font-family: Arial, sans-serif; font-weight: bold;\"\u003eIncrease field of view by 43%: \u003c\/span\u003e\u003cspan style=\"font-size: 10.5pt; font-family: Arial, sans-serif;\"\u003eBetter for capturing wide field images of larger galaxies and nebulae\u003co:p\u003e\u003c\/o:p\u003e\u003c\/span\u003e\u003c\/p\u003e  \u003cp class=\"MsoNormal\" style=\"margin-top:11.25pt;margin-right:0in;margin-bottom: 6.0pt;margin-left:0in;line-height:normal;mso-outline-level:3\"\u003e\u003cspan style=\"font-size: 13.5pt; font-family: Arial, sans-serif; font-weight: bold;\"\u003eGlass\u003co:p\u003e\u003c\/o:p\u003e\u003c\/span\u003e\u003c\/p\u003e  \u003cp class=\"MsoNormal\" style=\"mso-margin-top-alt:auto;margin-bottom:3.75pt; margin-left:0in;text-indent:-.25in;line-height:normal;mso-list:l0 level1 lfo2; tab-stops:list .5in\"\u003e\u003c!--[if !supportLists]--\u003e\u003cspan style=\"font-size: 10pt; font-family: Symbol;\"\u003e\u003cspan style=\"mso-list:Ignore\"\u003e·\u003cspan style=\"font:7.0pt \" times new roman\u003e         \u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c!--[endif]--\u003e\u003cspan style=\"font-size: 10.5pt; font-family: Arial, sans-serif; font-weight: bold;\"\u003eLanthanum Glass Elements: \u003c\/span\u003e\u003cspan style=\"font-size: 10.5pt; font-family: Arial, sans-serif;\"\u003eEdgeHD reducer uses \"rare earth\" Lanthanum glass elements for clear, high contrast viewing while minimizing chromatic aberration\u003co:p\u003e\u003c\/o:p\u003e\u003c\/span\u003e\u003c\/p\u003e  \u003cp class=\"MsoNormal\" style=\"mso-margin-top-alt:auto;margin-bottom:3.75pt; margin-left:0in;text-indent:-.25in;line-height:normal;mso-list:l0 level1 lfo2; tab-stops:list .5in\"\u003e\u003c!--[if !supportLists]--\u003e\u003cspan style=\"font-size: 10pt; font-family: Symbol;\"\u003e\u003cspan style=\"mso-list:Ignore\"\u003e·\u003cspan style=\"font:7.0pt \" times new roman\u003e         \u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c!--[endif]--\u003e\u003cspan style=\"font-size: 10.5pt; font-family: Arial, sans-serif; font-weight: bold;\"\u003eFully multi-coated lens elements:\u003c\/span\u003e\u003cspan style=\"font-size: 10.5pt; font-family: Arial, sans-serif;\"\u003e All air-to-glass surfaces have multiple layers of coating for maximum light transmission and color correction\u003co:p\u003e\u003c\/o:p\u003e\u003c\/span\u003e\u003c\/p\u003e  \u003cp class=\"MsoNormal\" style=\"mso-margin-top-alt:auto;margin-bottom:3.75pt; margin-left:0in;text-indent:-.25in;line-height:normal;mso-list:l0 level1 lfo2; tab-stops:list .5in\"\u003e\u003c!--[if !supportLists]--\u003e\u003cspan style=\"font-size: 10pt; font-family: Symbol;\"\u003e\u003cspan style=\"mso-list:Ignore\"\u003e·\u003cspan style=\"font:7.0pt \" times new roman\u003e         \u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c!--[endif]--\u003e\u003cspan style=\"font-size: 10.5pt; font-family: Arial, sans-serif; font-weight: bold;\"\u003eBlacken edges:\u003c\/span\u003e\u003cspan style=\"font-size: 10.5pt; font-family: Arial, sans-serif;\"\u003e All lens elements have blacken edges to minimize internal reflection and maximize contrast\u003co:p\u003e\u003c\/o:p\u003e\u003c\/span\u003e\u003c\/p\u003e  \u003cp class=\"MsoNormal\" style=\"margin-top:11.25pt;margin-right:0in;margin-bottom: 6.0pt;margin-left:0in;line-height:normal;mso-outline-level:3\"\u003e\u003cspan style=\"font-size: 13.5pt; font-family: Arial, sans-serif; font-weight: bold;\"\u003eFull Frame Design\u003co:p\u003e\u003c\/o:p\u003e\u003c\/span\u003e\u003c\/p\u003e  \u003cp class=\"MsoNormal\" style=\"mso-margin-top-alt:auto;margin-bottom:3.75pt; margin-left:0in;text-indent:-.25in;line-height:normal;mso-list:l2 level1 lfo3; tab-stops:list .5in\"\u003e\u003c!--[if !supportLists]--\u003e\u003cspan style=\"font-size: 10pt; font-family: Symbol;\"\u003e\u003cspan style=\"mso-list:Ignore\"\u003e·\u003cspan style=\"font:7.0pt \" times new roman\u003e         \u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c!--[endif]--\u003e\u003cspan style=\"font-size: 10.5pt; font-family: Arial, sans-serif; font-weight: bold;\"\u003eThreads directly onto the 3.25\" threads of the EdgeHD optical tube: \u003c\/span\u003e\u003cspan style=\"font-size: 10.5pt; font-family: Arial, sans-serif;\"\u003eReduces mechanical vignetting and allows for use with larger (full frame) sensors and Off-Axis Guiders\u003co:p\u003e\u003c\/o:p\u003e\u003c\/span\u003e\u003c\/p\u003e  \u003cp class=\"MsoNormal\" style=\"mso-margin-top-alt:auto;margin-bottom:3.75pt; margin-left:0in;text-indent:-.25in;line-height:normal;mso-list:l2 level1 lfo3; tab-stops:list .5in\"\u003e\u003c!--[if !supportLists]--\u003e\u003cspan style=\"font-size: 10pt; font-family: Symbol;\"\u003e\u003cspan style=\"mso-list:Ignore\"\u003e·\u003cspan style=\"font:7.0pt \" times new roman\u003e         \u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c!--[endif]--\u003e\u003cspan style=\"font-size: 10.5pt; font-family: Arial, sans-serif; font-weight: bold;\"\u003eClear aperture: \u003c\/span\u003e\u003cspan style=\"font-size: 10.5pt; font-family: Arial, sans-serif;\"\u003e60 mm clear aperture lens optimized for a 42 mm image circle for use with large CCD sensors.\u003co:p\u003e\u003c\/o:p\u003e\u003c\/span\u003e\u003c\/p\u003e  \u003cp class=\"MsoNormal\" style=\"margin-top:11.25pt;margin-right:0in;margin-bottom: 6.0pt;margin-left:0in;line-height:normal;mso-outline-level:3\"\u003e\u003cspan style=\"font-size: 13.5pt; font-family: Arial, sans-serif; font-weight: bold;\"\u003eMechanical Design\u003co:p\u003e\u003c\/o:p\u003e\u003c\/span\u003e\u003c\/p\u003e  \u003cp class=\"MsoNormal\" style=\"mso-margin-top-alt:auto;margin-bottom:3.75pt; margin-left:0in;text-indent:-.25in;line-height:normal;mso-list:l4 level1 lfo4; tab-stops:list .5in\"\u003e\u003c!--[if !supportLists]--\u003e\u003cspan style=\"font-size: 10pt; font-family: Symbol;\"\u003e\u003cspan style=\"mso-list:Ignore\"\u003e·\u003cspan style=\"font:7.0pt \" times new roman\u003e         \u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c!--[endif]--\u003e\u003cspan style=\"font-size: 10.5pt; font-family: Arial, sans-serif; font-weight: bold;\"\u003eMachined aluminum housing: \u003c\/span\u003e\u003cspan style=\"font-size: 10.5pt; font-family: Arial, sans-serif;\"\u003eComputer assisted CNC machined aluminum housing for precise spacing and alignment of the optical elements.\u003co:p\u003e\u003c\/o:p\u003e\u003c\/span\u003e\u003c\/p\u003e  \u003cp class=\"MsoNormal\" style=\"mso-margin-top-alt:auto;margin-bottom:3.75pt; margin-left:0in;text-indent:-.25in;line-height:normal;mso-list:l4 level1 lfo4; tab-stops:list .5in\"\u003e\u003c!--[if !supportLists]--\u003e\u003cspan style=\"font-size: 10pt; font-family: Symbol;\"\u003e\u003cspan style=\"mso-list:Ignore\"\u003e·\u003cspan style=\"font:7.0pt \" times new roman\u003e         \u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c!--[endif]--\u003e\u003cspan style=\"font-size: 10.5pt; font-family: Arial, sans-serif; font-weight: bold;\"\u003eThreaded metal covers for both ends of the lens assembly: \u003c\/span\u003e\u003cspan style=\"font-size: 10.5pt; font-family: Arial, sans-serif;\"\u003eTo protect your investment from unwanted dust and scratches.\u003co:p\u003e\u003c\/o:p\u003e\u003c\/span\u003e\u003c\/p\u003e  \u003cp class=\"MsoNormal\" style=\"margin-top:11.25pt;margin-right:0in;margin-bottom: 6.0pt;margin-left:0in;line-height:normal;mso-outline-level:3\"\u003e\u003cspan style=\"font-size: 13.5pt; font-family: Arial, sans-serif; font-weight: bold;\"\u003eVersatility\u003co:p\u003e\u003c\/o:p\u003e\u003c\/span\u003e\u003c\/p\u003e  \u003cp class=\"MsoNormal\" style=\"mso-margin-top-alt:auto;margin-bottom:3.75pt; margin-left:0in;text-indent:-.25in;line-height:normal;mso-list:l3 level1 lfo5; tab-stops:list .5in\"\u003e\u003c!--[if !supportLists]--\u003e\u003cspan style=\"font-size: 10pt; font-family: Symbol;\"\u003e\u003cspan style=\"mso-list:Ignore\"\u003e·\u003cspan style=\"font:7.0pt \" times new roman\u003e         \u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c!--[endif]--\u003e\u003cspan style=\"font-size: 10.5pt; font-family: Arial, sans-serif; font-weight: bold;\"\u003eFastar compatibility and f\/2 imaging with optional accessory: \u003c\/span\u003e\u003cspan style=\"font-size: 10.5pt; font-family: Arial, sans-serif;\"\u003ethe EdgeHD is the most complete imaging system in its price range.\u003co:p\u003e\u003c\/o:p\u003e\u003c\/span\u003e\u003c\/p\u003e  \u003cp class=\"MsoNormal\"\u003e\u003co:p\u003e \u003c\/o:p\u003e\u003c\/p\u003e\u003cbr class=\"innova\"\u003e","brand":"Celestron","offers":[{"title":"Default Title","offer_id":44013399900271,"sku":"94245","price":610.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/94245_Reducer_Lens_EdgeHD_925_1_d67fe260-82bd-4117-9da2-231488df5781_570x3802x__74743.jpg?v=1766553238"},{"product_id":"reducer-lens-7x-edgehd-800","title":"REDUCER LENS .7X - EDGEHD 800","description":"\u003cp style=\"box-sizing: inherit; margin: 0px 0px 15px; padding: 0px; color: rgb(51, 62, 72); font-family: \" open sans arial helvetica sans-serif font-size:=\"\"\u003eCelestron’s new EdgeHD reducers features a custom 4 element optical design engineered to maintain the flat-field performance of our award winning EdgeHD optical system. Unlike generic reducers, our premium reducers provide substantial back focus to accommodate an assortment of imaging accessories.\u003c\/p\u003e\u003cp style=\"box-sizing: inherit; margin: 0px 0px 15px; padding: 0px; color: rgb(51, 62, 72); font-family: \" open sans arial helvetica sans-serif font-size:=\"\"\u003eEdgeHD reducers offer high index optical elements, including extra low dispersion, exotic Lanthanum elements, which provide high contrast viewing while minimizing chromatic aberration. All air to glass lens surfaces feature multiple layers of coating for maximum light transmission and color correction and contain blacken edges to minimize internal reflection and maximize image contrast.\u003c\/p\u003e\u003cp style=\"box-sizing: inherit; margin: 0px 0px 15px; padding: 0px; color: rgb(51, 62, 72); font-family: \" open sans arial helvetica sans-serif font-size:=\"\"\u003eIncorporating computer assisted CNC machined aluminum housing, for precise spacing and alignment of optical elements, and threaded metal covers on the lens assembly to protect your investment from dust and scratches, our reducers offer you an outstanding mechanical design.\u003c\/p\u003e\u003cp style=\"box-sizing: inherit; margin: 0px 0px 15px; padding: 0px; color: rgb(51, 62, 72); font-family: \" open sans arial helvetica sans-serif font-size:=\"\"\u003eWith the Fastar option on all EdgeHD optical systems, coupled with the .7x reducer, your telescope becomes the most complete imaging system available in its price range today.\u003c\/p\u003e\u003ch3 style=\"box-sizing: inherit; margin: 15px 0px 0.5em; padding: 0px; color: rgb(51, 62, 72); font-family: \" open sans arial helvetica sans-serif\u003ePerformance\u003c\/h3\u003e\u003cul style=\"box-sizing: inherit; margin: 15px 0px; padding: 0px; list-style: none; color: rgb(51, 62, 72); font-family: \" open sans arial helvetica sans-serif font-size:=\"\"\u003e\n\u003cli style=\"box-sizing: inherit; position: relative; margin-bottom: 5px; padding-left: 15px;\"\u003e\n\u003cspan style=\"box-sizing: inherit; font-weight: bolder;\"\u003eDesign:\u003c\/span\u003e 4-element optical layout designed specifically for the EdgeHD 8\" to maintain the flat-field performance of the EdgeHD optical design\u003c\/li\u003e\n\u003cli style=\"box-sizing: inherit; position: relative; margin-bottom: 5px; padding-left: 15px;\"\u003e\n\u003cspan style=\"box-sizing: inherit; font-weight: bolder;\"\u003e105 mm of back focus:\u003c\/span\u003e Provides generous back focus to accommodate additional accessories and a wide variety of cameras. Also allows use of existing T-Adapters for EdgeHD 800 and other Celestron imaging accessories\u003c\/li\u003e\n\u003cli style=\"box-sizing: inherit; position: relative; margin-bottom: 5px; padding-left: 15px;\"\u003e\n\u003cspan style=\"box-sizing: inherit; font-weight: bolder;\"\u003eOne full F-Stop faster than f\/10:\u003c\/span\u003e Reduces the exposure time by one-half to capture the same brightness of object\u003c\/li\u003e\n\u003cli style=\"box-sizing: inherit; position: relative; margin-bottom: 5px; padding-left: 15px;\"\u003e\n\u003cspan style=\"box-sizing: inherit; font-weight: bolder;\"\u003eIncrease field of view by 43%: \u003c\/span\u003eBetter for capturing wide field images of larger galaxies and nebulae\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3 style=\"box-sizing: inherit; margin: 15px 0px 0.5em; padding: 0px; color: rgb(51, 62, 72); font-family: \" open sans arial helvetica sans-serif\u003eGlass\u003c\/h3\u003e\u003cul style=\"box-sizing: inherit; margin: 15px 0px; padding: 0px; list-style: none; color: rgb(51, 62, 72); font-family: \" open sans arial helvetica sans-serif font-size:=\"\"\u003e\n\u003cli style=\"box-sizing: inherit; position: relative; margin-bottom: 5px; padding-left: 15px;\"\u003e\n\u003cspan style=\"box-sizing: inherit; font-weight: bolder;\"\u003eLanthanum Glass Elements: \u003c\/span\u003eEdgeHD reducer uses \"rare earth\" Lanthanum glass elements for clear, high contrast viewing while minimizing chromatic aberration\u003c\/li\u003e\n\u003cli style=\"box-sizing: inherit; position: relative; margin-bottom: 5px; padding-left: 15px;\"\u003e\n\u003cspan style=\"box-sizing: inherit; font-weight: bolder;\"\u003eFully multi-coated lens elements:\u003c\/span\u003e All air-to-glass surfaces have multiple layers of coating for maximum light transmission and color correction\u003c\/li\u003e\n\u003cli style=\"box-sizing: inherit; position: relative; margin-bottom: 5px; padding-left: 15px;\"\u003e\n\u003cspan style=\"box-sizing: inherit; font-weight: bolder;\"\u003eBlacken edges:\u003c\/span\u003e All lens elements have blacken edges to minimize internal reflection and maximize contrast\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3 class=\"p1\" style=\"box-sizing: inherit; margin: 15px 0px 0.5em; padding: 0px; color: rgb(51, 62, 72); font-family: \" open sans arial helvetica sans-serif\u003eLarge Illuminated Field\u003c\/h3\u003e\u003cul style=\"box-sizing: inherit; margin: 15px 0px; padding: 0px; list-style: none; color: rgb(51, 62, 72); font-family: \" open sans arial helvetica sans-serif font-size:=\"\"\u003e\u003cli style=\"box-sizing: inherit; position: relative; margin-bottom: 5px; padding-left: 15px;\"\u003e\n\u003cspan style=\"box-sizing: inherit; font-weight: bolder;\"\u003eOptimized for APS-C sized sensors: \u003c\/span\u003eIncluding most DSLR cameras and Nightscape CCD cameras\u003c\/li\u003e\u003c\/ul\u003e\u003ch3 style=\"box-sizing: inherit; margin: 15px 0px 0.5em; padding: 0px; color: rgb(51, 62, 72); font-family: \" open sans arial helvetica sans-serif\u003eMechanical Design\u003c\/h3\u003e\u003cul style=\"box-sizing: inherit; margin: 15px 0px; padding: 0px; list-style: none; color: rgb(51, 62, 72); font-family: \" open sans arial helvetica sans-serif font-size:=\"\"\u003e\n\u003cli style=\"box-sizing: inherit; position: relative; margin-bottom: 5px; padding-left: 15px;\"\u003e\n\u003cspan style=\"box-sizing: inherit; font-weight: bolder;\"\u003eMachined aluminum housing: \u003c\/span\u003eComputer assisted CNC machined aluminum housing for precise spacing and alignment of the optical elements.\u003c\/li\u003e\n\u003cli style=\"box-sizing: inherit; position: relative; margin-bottom: 5px; padding-left: 15px;\"\u003e\n\u003cspan style=\"box-sizing: inherit; font-weight: bolder;\"\u003eThreaded metal covers for both ends of the lens assembly: \u003c\/span\u003eTo protect your investment from unwanted dust and scratches.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3 style=\"box-sizing: inherit; margin: 15px 0px 0.5em; padding: 0px; color: rgb(51, 62, 72); font-family: \" open sans arial helvetica sans-serif\u003eVersatility\u003c\/h3\u003e\u003cul style=\"box-sizing: inherit; margin: 15px 0px; padding: 0px; list-style: none; color: rgb(51, 62, 72); font-family: \" open sans arial helvetica sans-serif font-size:=\"\"\u003e\u003cli style=\"box-sizing: inherit; position: relative; margin-bottom: 5px; padding-left: 15px;\"\u003e\u003cspan style=\"box-sizing: inherit; font-weight: bolder;\"\u003eProvides and intermediate focal length between EdgeHD's native f\/10 (or f\/11) and the optional Hyperstar accessory at f\/2, making the EdgeHD the most complete imaging system in its price range\u003cbr style=\"box-sizing: inherit;\"\u003e\u003c\/span\u003e\u003c\/li\u003e\u003c\/ul\u003e","brand":"Celestron","offers":[{"title":"Default Title","offer_id":44013457866863,"sku":"94242","price":582.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/94242_reducer_lens_edgehd__79693.jpg?v=1766553527"},{"product_id":"48mm-adapter-ring-for-starfield-reducers-flattener","title":"48mm Adapter ring for Starfield Reducers \/ Flattener","description":"\u003cspan style=\"font-family: Arial; font-size: 14pt;\"\u003eReplace the 42mm T-Rings on the Starfield Reducers and Flatteners with a 48mm T-Ring Thread for fill frame cameras.\u003c\/span\u003e","brand":"Starfield","offers":[{"title":"Default Title","offer_id":44013465305199,"sku":"48-Adapter","price":47.0,"currency_code":"CAD","in_stock":true}]},{"product_id":"adjustable-2-5-reducer-for-ed102-and-gear-115","title":"Adjustable 2.5\" Reducer for ED102 and Gear 115","description":"\u003cp style=\"box-sizing: inherit; margin: 0px; font-family: Helvetica, arial, sans-serif; font-size: 16px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"box-sizing: inherit;\"\u003eThe Starfield 0.8x adjustable reducer and flattener makes finding the correct back focus easy!  Fighting with adapters is a thing of the past! \u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"box-sizing: inherit; margin: 0px; font-family: Helvetica, arial, sans-serif; font-size: 16px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"box-sizing: inherit;\"\u003e\u003cbr style=\"box-sizing: inherit; clear: both;\"\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"box-sizing: inherit; margin: 0px; font-family: Helvetica, arial, sans-serif; font-size: 16px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"box-sizing: inherit;\"\u003eBy setting the adjustment to 14.87mm with the scale, achieving 55mm of back focus is simple, and if more adjustment is needed for fine tuning all that is needed is a small twist.    If you are using accessories such as filter wheels and rotators you can not still get the required back focus.   Just add up the thickness of all the accessories, plus the distance to your sensor and subtract from 69.87 and then set the reducer to the number that is calculated.\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"box-sizing: inherit; margin: 0px; font-family: Helvetica, arial, sans-serif; font-size: 16px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"box-sizing: inherit;\"\u003e\u003cbr style=\"box-sizing: inherit; clear: both;\"\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"box-sizing: inherit; margin: 0px; font-family: Helvetica, arial, sans-serif; font-size: 16px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"box-sizing: inherit;\"\u003eThe reducer attaches directly to the Starfield ED102 telescope focuser by removing the Axil lock.  Using the supplied 1.5mm Allen key, loosen off the three screws a half turn and then unscrew the lock.  \u003cbr style=\"box-sizing: inherit; clear: both;\"\u003eThread the reducer onto the focuser.   \u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"box-sizing: inherit; margin: 0px; font-family: Helvetica, arial, sans-serif; font-size: 16px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"box-sizing: inherit;\"\u003e\u003cbr style=\"box-sizing: inherit; clear: both;\"\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"box-sizing: inherit; margin: 0px; font-family: Helvetica, arial, sans-serif; font-size: 16px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"box-sizing: inherit;\"\u003eThis Reducer can also be used for other Telescopes lager than 102mm\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"box-sizing: inherit; margin: 0px; background-color: rgb(255, 255, 255);\"\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\u003cspan style=\"font-family: Helvetica, arial, sans-serif;\"\u003e102 mm \/ focal ratio f\/7 - 69.87 mm\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"font-family: Helvetica, arial, sans-serif;\"\u003e107 mm \/ focal ratio f\/6.5 - 69.0 mm\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"font-family: Helvetica, arial, sans-serif;\"\u003e130 mm \/ focal ratio f\/7 - 66.17 mm\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"font-family: Helvetica, arial, sans-serif;\"\u003e140 mm \/ focal ratio f\/6.5 - 65.8 mm\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"font-family: Helvetica, arial, sans-serif;\"\u003e150 mm \/ focal ratio f\/8 - 63.34 mm\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"font-family: Helvetica, arial, sans-serif;\"\u003e155 mm \/ focal ratio f\/8 - 62.57 mm\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003c\/p\u003e\u003cp style=\"box-sizing: inherit; margin: 0px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"box-sizing: inherit; font-family: Helvetica, arial, sans-serif;\"\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\u003cp style=\"box-sizing: inherit; margin: 0px; font-family: Helvetica, arial, sans-serif; font-size: 16px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"box-sizing: inherit;\"\u003eFilters can be added inside the reducer.\u003c\/span\u003e\u003c\/p\u003e","brand":"Starfield","offers":[{"title":"Default Title","offer_id":44013603684463,"sku":"SF-FFRA08-2.5","price":354.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/IMG_4055__41914.jpg?v=1766557496"},{"product_id":"baader-pushfix-reducer-2-to-1-t-2-part-15a","title":"Baader Pushfix Reducer 2\" to 1¼\" (T-2 part #15a)","description":"\u003cul style=\"box-sizing: inherit; -webkit-font-smoothing: antialiased; text-size-adjust: none; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); margin-top: 1rem; margin-bottom: 1rem; color: rgb(76, 81, 84); font-family: \" libre franklin sans-serif font-size:=\"\" padding:=\"\" margin-left:=\"\"\u003e\n\u003cli style=\"box-sizing: inherit; -webkit-font-smoothing: antialiased; text-size-adjust: none; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); list-style: disc !important;\"\u003eIdeal for Newton Focuser e.g. Baader Newton Crayford focusers with only 1mm optical path length\u003c\/li\u003e\n\u003cli style=\"box-sizing: inherit; -webkit-font-smoothing: antialiased; text-size-adjust: none; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); list-style: disc !important;\"\u003eProvides three separate mounting options for 1¼\" accessories\u003c\/li\u003e\n\u003cli style=\"box-sizing: inherit; -webkit-font-smoothing: antialiased; text-size-adjust: none; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); list-style: disc !important;\"\u003eSide clamping screw and brass clamping ring for secure grip. Also includes countersunk grub screws for permanent or quick release operation of the brass clamping ring.\u003c\/li\u003e\n\u003cli style=\"box-sizing: inherit; -webkit-font-smoothing: antialiased; text-size-adjust: none; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); list-style: disc !important;\"\u003eThe countersunk Delrin grub screws allow for the pressure to be set correctly. This acts as a quick release without relying on set screws. When an eye piece is inserted it is held securely and safely while still allowing the eye piece to be removed.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp style=\"box-sizing: inherit; -webkit-font-smoothing: antialiased; text-size-adjust: none; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); margin-top: 1rem; margin-bottom: 1rem; color: rgb(76, 81, 84); font-family: \" libre franklin sans-serif font-size:=\"\"\u003eOur 2\"\/1¼” reducer permits you convert your 2\" focuser for use with 1¼” eyepieces and accessories. As with its little brother, the 2\" reducer incorporates several useful features. A captive spring bronze lock ring guarantees protection of your eyepiece barrels from damage. This reducer also incorporates two large nickel plated brass knurled clamp screws that are oriented 90 degrees apart. The inclusion of two clamp screws results in a superior 3-point attachment that completely constrains your equipment from wobble, particularly important for imaging applications (typical single clamp screw adapters still allow some motion). Also, for those users that are physically unable to firmly grasp and tighten lock screws, the addition of a second screw doubles the locking force (ie, particularly nice for those unable to grip tightly due to arthritis).\u003cbr style=\"box-sizing: inherit; -webkit-font-smoothing: antialiased; text-size-adjust: none; -webkit-tap-highlight-color: rgba(0, 0, 0, 0);\"\u003e\u003cbr style=\"box-sizing: inherit; -webkit-font-smoothing: antialiased; text-size-adjust: none; -webkit-tap-highlight-color: rgba(0, 0, 0, 0);\"\u003eThe input side is provided with 48mm filter threads, and also includes a nested internal T-2 thread which enables you to use the reducer along with the other T-2 system components. One more unique feature sets our reducer apart - it includes an external T-2 thread that surrounds the eyepiece opening (covered and dressed by a knurled removable ring). This thread permits you to couple other T-2 accessories to the output side. In one application, you can attach T-2 Extension Tubes and create an extremely rigid afocal or eyepiece projection system. Once again, you are free to creatively construct your own combinations.\u003c\/p\u003e","brand":"Baader Planetarium","offers":[{"title":"Default Title","offer_id":44013605388399,"sku":"T2-15A","price":76.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/2408151-8-O-N-3_753x600__47054.jpg?v=1766557529"},{"product_id":"sharpstar-94edph-f4-4-reducer","title":"Sharpstar 94EDPH F4.4 Reducer","description":"\u003cdiv\u003e\u003cspan style=\"font-family: Arial;\"\u003eSHARPSTAR F4.4 Full Frame Focal Reducer made especially for 94EDPH refractor telescopes, it satisfy the demands of full-frame photography. \u003c\/span\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cspan style=\"font-family: Arial;\"\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cspan style=\"font-family: Arial;\"\u003eThe reducer uses 2.5\" lens, provides one end of a M74×1 thread, to attach the focuser of main tube. And the other end features a M48×0.75 thread, to connect camera with 55mm back focus. This reducer's interal optics consist of quadruplet air-spaced lens structure, supports full-frame photography, generates a 50mm image circle, perfect for edge decreased field illumination control. The f\/4.4 reducer works with 94EDPH refractor, reducing the  focal length to 414mm,  is the optimal choice for deep-sky astrophotography.\u003c\/span\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cspan style=\"font-family: Arial;\"\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cspan style=\"font-family: Arial;\"\u003eIn addition, the f\/4.4 reducer features a 360-degree rotator, allows you to easily rotate the camera for astroimaging. The M48 adapter has built-in 2\" filter thread when necessary.\u003c\/span\u003e\u003c\/div\u003e","brand":"Sharpstar","offers":[{"title":"Default Title","offer_id":44013650182255,"sku":"94EDPH-0.8","price":515.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/1601450368__81135.jpg?v=1766558638"},{"product_id":"sharpstar-76edph-f4-5-reducer","title":"SHARPSTAR 76EDPH F4.5 Reducer","description":"\u003cspan style=\"font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003eSHARPSTAR 76EDPH F4.5 is the latest development in dedicated full-frame reducer, which meets the need of full-frame photography. \u003c\/span\u003e\u003cdiv\u003e\u003cspan style=\"font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cspan style=\"font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003eThe reducer is equipped with a 2.5\" lens specs, one end of which adopts a M74×1 thread and connects to the pinion focuser of the primary mirror. The other end adopts a M48×0.75 thread, the focal plane is 55mm from the end interface. The reducer features a triplet air-spaced structure, and full-frame photography is supported, which achieve excellent perimeter dimmer control. The reducer is specifically designed for deep-space widefield astro photography with a focal length of 342mm and a focal ratio of f\/4.5.\u003c\/span\u003e\u003c\/div\u003e\u003cdiv\u003e\n\u003cbr style=\"font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"font-family: ????; font-size: 14px; background-color: rgb(255, 255, 255);\"\u003eIn addition, the 360-degree rotator allows you to easily rotate the camera to achieve the best image framing. The M48 interface contains 2 \"filter thread for easy connection\u003c\/span\u003e\n\u003c\/div\u003e","brand":"Sharpstar","offers":[{"title":"Default Title","offer_id":44013650313327,"sku":"76EDPH-0.8","price":384.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/1573713457__35850.jpg?v=1766558643"},{"product_id":"sharpstar-2-5-0-8x-reducer-for-rcs","title":"Sharpstar 2.5\" 0.8x Reducer for RC's","description":"\u003cp\u003eThe RC2508 0.8x Focal Reducer\/Corrector offers full frame imaging with Ritchey Chretien telescopes between f\/6 and f\/9 focal ratios.\u003c\/p\u003e\n\u003cp\u003eFeaturing an M78x1 threaded front end for connection directly to various SharpStar focusers and an M74x1 threaded connection camera side,  the RC2508 Reducer also ships with an M48x0.75 Camera Adaptor that provides for standard camera connectivity with 55mm of back focus distance.\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/sharpstar_rc2508_dimensions_1_47742e1c-05e0-4d8c-acef-14b74b4fa1b6.jpg?v=1766558672\" alt=\"\"\u003e\u003c\/p\u003e","brand":"Ontario Telescope and Accessories","offers":[{"title":"Default Title","offer_id":44013651984495,"sku":"RC2508","price":519.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/1561009682__52497.jpg?v=1766558673"},{"product_id":"baader-2-to-1-clicklock-reducer","title":"Baader 2\" to 1¼\" ClickLock Reducer","description":"\u003cul style=\"box-sizing: border-box; margin: 0px 0px 1em; padding: 0px; list-style-position: initial; list-style-image: initial; font-family: \" open sans sans-serif rgb color:=\"\" font-size:=\"\" background-color:=\"\"\u003e\n\u003cli style=\"box-sizing: border-box; margin: 0.5em 0px 0px 1.5em; padding: 0px;\"\u003ePrecision machined reducer to complement the Baader 2\" ClickLock-System, inserted height only 9.5mm\u003c\/li\u003e\n\u003cli style=\"box-sizing: border-box; margin: 0.5em 0px 0px 1.5em; padding: 0px;\"\u003eFirmly holds all 1¼\" eyepieces, accessories, and diagonals\u003c\/li\u003e\n\u003cli style=\"box-sizing: border-box; margin: 0.5em 0px 0px 1.5em; padding: 0px;\"\u003eClickLock compression ring made of hardened bronze ensures lifetime non-marring operation\u003c\/li\u003e\n\u003cli style=\"box-sizing: border-box; margin: 0.5em 0px 0px 1.5em; padding: 0px;\"\u003eFingertip operated twist-lock system works like a CNC machine chuck – onto the compression ring\u003c\/li\u003e\n\u003cli style=\"box-sizing: border-box; margin: 0.5em 0px 0px 1.5em; padding: 0px;\"\u003eBidirectional ratcheted lever (no thumbscrew!) indicates open\/close position in the dark\u003c\/li\u003e\n\u003cli style=\"box-sizing: border-box; margin: 0.5em 0px 0px 1.5em; padding: 0px;\"\u003eGentle touch onto the lever results in ultra-strong locking action – and easy release\u003c\/li\u003e\n\u003cli style=\"box-sizing: border-box; margin: 0.5em 0px 0px 1.5em; padding: 0px;\"\u003eAccepts all astronomical, cell-mounted 2\" eyepiece-filters\u003c\/li\u003e\n\u003cli style=\"box-sizing: border-box; margin: 0.5em 0px 0px 1.5em; padding: 0px;\"\u003eT-2 (M42x0.75) inner photo-thread attaches onto most T-2 threaded accessories and all Baader T-2 diagonals\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Baader Planetarium","offers":[{"title":"Default Title","offer_id":44013653295215,"sku":"T2-15B","price":112.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/baader-2-to-1-1-4-clicklock-reducer-t-2-part-15b-498__62525.jpg?v=1766558735"},{"product_id":"starfield-adjustable-2-0-8x-reducer","title":"Starfield Adjustable 2\" 0.8x Reducer","description":"\u003cp style=\"box-sizing: inherit; margin: 0px; font-family: Helvetica, arial, sans-serif; font-size: 16px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"box-sizing: inherit;\"\u003eThe Starfield 2\" 0.8x adjustable reducer and flattener makes finding the correct back focus easy!  Fighting with adapters is a thing of the past! \u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"box-sizing: inherit; margin: 0px; font-family: Helvetica, arial, sans-serif; font-size: 16px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"box-sizing: inherit;\"\u003e\u003cbr style=\"box-sizing: inherit; clear: both;\"\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"box-sizing: inherit; margin: 0px; font-family: Helvetica, arial, sans-serif; font-size: 16px; background-color: rgb(255, 255, 255);\"\u003e\u003cbr\u003e\u003c\/p\u003e\u003cp style=\"box-sizing: inherit; margin: 0px; font-family: Helvetica, arial, sans-serif; font-size: 16px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"box-sizing: inherit;\"\u003eThe reducer attaches directly to the Starfield telescopes focuser by removing the Axil lock. It can also be used when paired with a 2\" adapter.  Using the supplied 1.5mm Allen key, loosen off the three screws a half turn and then unscrew the lock.  \u003cbr style=\"box-sizing: inherit; clear: both;\"\u003eThread the reducer onto the focuser.   \u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"box-sizing: inherit; margin: 0px; font-family: Helvetica, arial, sans-serif; font-size: 16px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"box-sizing: inherit;\"\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"box-sizing: inherit; margin: 0px; font-family: Helvetica, arial, sans-serif; font-size: 16px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"box-sizing: inherit;\"\u003eThis Reducer can also be used for other Telescopes that are 70-102mm in aperture.\u003c\/span\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\u003cspan style=\"font-family: Helvetica, arial, sans-serif;\"\u003e102 mm \/ focal ratio f\/7 - 55 mm\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"font-family: Helvetica, arial, sans-serif;\"\u003e90mm \/ focal ratio f\/6  - 58 mm \u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"font-family: Helvetica, arial, sans-serif;\"\u003e80 mm \/ focal ratio f\/7 - 57.6 mm\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"font-family: Helvetica, arial, sans-serif;\"\u003e80 mm \/ focal ratio f\/6 - 59.6 mm\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"font-family: Helvetica, arial, sans-serif;\"\u003e70 mm \/ focal ratio f\/6 - 61.6 mm\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp style=\"box-sizing: inherit; margin: 0px; font-family: Helvetica, arial, sans-serif; font-size: 16px; background-color: rgb(255, 255, 255);\"\u003e\u003cbr\u003e\u003c\/p\u003e\u003cp style=\"box-sizing: inherit; margin: 0px; font-family: Helvetica, arial, sans-serif; font-size: 16px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"box-sizing: inherit; font-weight: bold;\"\u003eHow to set your distance.\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"box-sizing: inherit; margin: 0px; font-family: Helvetica, arial, sans-serif; font-size: 16px; background-color: rgb(255, 255, 255);\"\u003e\u003cbr\u003e\u003c\/p\u003e\u003cp style=\"box-sizing: inherit; margin: 0px; font-family: Helvetica, arial, sans-serif; font-size: 16px; background-color: rgb(255, 255, 255);\"\u003eStarfield 80mm f\/6 with 480 focal length\u003c\/p\u003e\u003cp style=\"box-sizing: inherit; margin: 0px; font-family: Helvetica, arial, sans-serif; font-size: 16px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"box-sizing: inherit;\"\u003eDSLR with 55mm backfocus when using a T-Ring\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"box-sizing: inherit; margin: 0px; font-family: Helvetica, arial, sans-serif; font-size: 16px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"box-sizing: inherit;\"\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"box-sizing: inherit; margin: 0px; font-family: Helvetica, arial, sans-serif; font-size: 16px; background-color: rgb(255, 255, 255);\"\u003eThe reducers distance for 80mm f\/6 is 59.6mm.   59.6mm - 55mm (DSLR and T-Ring) is 4.6mm.  Simply adjust the reducer to the 4.6mm mark an you are now ready to take pictures.   Fine tuning can be done if needed.  \u003c\/p\u003e\u003cp style=\"box-sizing: inherit; margin: 0px; font-family: Helvetica, arial, sans-serif; font-size: 16px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"box-sizing: inherit;\"\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"box-sizing: inherit; margin: 0px; font-family: Helvetica, arial, sans-serif; font-size: 16px; background-color: rgb(255, 255, 255);\"\u003eFilters can be added inside the reducer.\u003c\/p\u003e","brand":"Starfield","offers":[{"title":"Default Title","offer_id":44013676953711,"sku":"SF-FFRA-08-2","price":319.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/IMG_5572__95904.jpg?v=1766559356"},{"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":"reducer-m68e-to-m48e-to-change-m68-internal-to-m48-external","title":"Reducer M68e to M48e - to change M68 internal to M48 external","description":"Reducer M68e to M48e - to change M68 internal to M48 external","brand":"Ontario Telescope and Accessories","offers":[{"title":"Default Title","offer_id":44013754777711,"sku":"M68\/M48","price":55.0,"currency_code":"CAD","in_stock":true}]},{"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":"61edph-f-4-4-full-frame-reducer","title":"61EDPHⅢ f\/4.4 Full-Frame Reducer","description":"\u003cp\u003e\u003cspan\u003eThe special full-frame reducer of 61EDPH Ⅲ: One end of the thread is M68 × 1, connected to the focuser; the other end of the thread is M48 × 0.75 and has a built-in 2\" filter thread.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe special full-frame reducer of 61EDPH Ⅲ: One end of the thread is M68 × 1, connected to the focuser; the other end of the thread is M48 × 0.75 and has a built-in 2\" filter thread. The back focus is 55mm. If it needs to be extended, the adapter can be screwed down to reveal the M54 × 0.75 male thread, and the back focus becomes 75mm. The focuser adopts a quadruplet air-spaced structure, supporting full-frame imaging. With the reducer, the focal ratio of 61EDPHⅢ is reduced to F4.4 and the focal length is reduced to 270mm, making the telescope the first choice for deep sky astrophotography.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cimg src=\"https:\/\/omo-oss-image.thefastimg.com\/portal-saas\/new2022072923460240318\/cms\/image\/7c4f1c90-3f30-48e2-87e9-9d6461bd2ee3.jpg\"\u003e\u003c\/span\u003e\u003c\/p\u003e","brand":"Sharpstar","offers":[{"title":"Default Title","offer_id":44013897711727,"sku":"61EDPHIII-F4.5","price":317.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/61EDPH_III_rducer__64267.png?v=1766565945"},{"product_id":"night-owl-4x-sct-reducer-corrector","title":"Night Owl - .4x SCT Reducer \/ Corrector","description":"\u003cp\u003eWith the 0.4x focal reduction factor, the field of view becomes 2.5x wider and exposure times are reduced by 6.25x! This allows you to capture amazing detail with very short exposures.\u003c\/p\u003e\n\u003cdiv\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/NightOwl_M1_C925_290MC_850aa542-e623-4f3a-8301-a7fdbb320710.jpg?v=1766566107\" alt=\"Crab Nebula taken with ZWO 290MC and Night Owl Reducer\"\u003e\u003c\/div\u003e\n\u003cp align=\"center\"\u003e \u003c\/p\u003e\n\u003cdiv\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/NightOwl_M97_C925_290MC_48ba6f09-28a7-40ec-bd49-91c3f0e94b23.jpg?v=1766566109\" alt=\"M97 taken with ZWO 290MC and Night Owl Reducer\"\u003e\u003c\/div\u003e\n\u003cp align=\"center\"\u003e\u003cem\u003eThe above images of M1 and M97 were taken with the Night Owl reducer on a Celestron 9.25” SCT\u003cbr\u003eusing an inexpensive ZWO ASI290MC uncooled color camera.\u003c\/em\u003e\u003c\/p\u003e\n\u003cp\u003eThe Night Owl 0.4x Reducer uses a 4-element optical design to provide excellent image quality over a 16mm image circle. The backfocus distance of 38.5mm allows the use of many popular one-shot-color CMOS and CCD cameras. It can also accommodate the Starizona Filter Slider for use with many monochrome camera models, and there is enough backfocus for a filter wheel with some camera models.\u003c\/p\u003e\n\u003cp\u003eThe focal reducer is housed in a 2\" diameter body and will fit into any standard 2\" visual back or focuser on the rear of an SCT. The camera side connection is a standard M42 T-thread. There are M48 threads on the telescope side for using a standard 2\" filter.\u003c\/p\u003e\n\u003cdiv\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/NightOwl_M33_C8_294MC_a670a65c-3959-4ece-92e3-bfed1639040a.jpg?v=1766566111\" alt=\"M33 taken with ZWO 294MC Pro and Night Owl Reducer\"\u003e\u003c\/div\u003e\n\u003cp align=\"center\"\u003e\u003cstrong\u003eA sensor larger than 16mm diagonal can be used but must be cropped to a 16mm format to keep good image quality.\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e\u003cem\u003eThis image of M33 was taken with the Night Owl reducer and Celestron 9.25” SCT with a ZWO ASI294MC camera cropped to a 16mm diagonal.\u003c\/em\u003e\u003c\/p\u003e\n\u003cp\u003eMonochrome cameras can be used with the Starizona Filter Slider. (Some cameras can use a filter wheel depending on the backfocus required.)\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cdiv\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/NightOwl_M42_C8_490EX_4b7e8987-5fb4-41d8-af27-af4edd6d7b53.jpg?v=1766566112\" alt=\"M42 taken with ATIK 490EX and Night Owl Reducer\"\u003e\u003c\/div\u003e\n\u003cp align=\"center\"\u003e\u003cbr\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp align=\"center\"\u003e\u003cem\u003eThis image of the Orion Nebula was taken with the Night Owl reducer on a Celestron 8” SCT with an Atik 490EX monochrome camera using H-alpha and OIII narrowband filters. Total exposure time is only 10 minutes.\u003c\/em\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eAdapters\u003cbr\u003e\u003c\/strong\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003eAs with all field-flattening reducers, the backfocus distance of 38.5mm must be maintained for the best performance. For example, if you are using a ZWO cooled camera with a 17.5mm backfocus, you would need a 21mm T-thread spacer. This adapter is included with the ZWO cooled cameras. For other camera combinations, you just need the right T-thread spacer to put your camera at the correct distance from the reducer. Contact us for help in choosing the right spacers.\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003cstrong\u003eSpecifications\u003c\/strong\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eFocal Reduction Factor: 0.4x\u003c\/li\u003e\n\u003cli\u003eMaximum Sensor Size: 16mm diagonal\u003c\/li\u003e\n\u003cli\u003eOptics: 4 elements, fully multi-coated\u003c\/li\u003e\n\u003cli\u003eFilter Threads: M48 (2\" filter)\u003c\/li\u003e\n\u003cli\u003eCamera Threads: M42 (T-threads)\u003c\/li\u003e\n\u003cli\u003eBackfocus: 38.5mm\u003c\/li\u003e\n\u003cli\u003eDiameter: 2\"\u003c\/li\u003e\n\u003cli\u003eOverall Length: 1.8\"\u003c\/li\u003e\n\u003cli\u003eWeight: 0.5 lbs.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Starizona","offers":[{"title":"Default Title","offer_id":44013907607663,"sku":"SCT-OWL","price":419.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/nightowl-reducer_650x650_fcf05f8a-6664-41a2-9ff7-dde556703bbb_650x650__45798.jpg?v=1766566114"},{"product_id":"imaging-focal-reducer","title":"Imaging Focal Reducer","description":"\u003cp\u003eDayStar's Imaging Focal Reducer can give you more field of view in your images. 2\" to T mount, with included T extension tube for even more reduction.\u003c\/p\u003e\n\u003cp\u003eWith a T-mount camera connected directly to the reducer, the focal length is cut in half - 0.5X. Add the 20mm extension tube for 0.33X. Even better is to combine the T-thread Interference Eliminator (sold separately) with the reducer for an interference-free 0.38X effect.\u003c\/p\u003e\n\u003cp\u003ePlease note that the obtainable field of view is usually limited by the etalon clear aperture; Quantum filters will result in a larger usable field than Quark or Ion.\u003c\/p\u003e\n\u003cp\u003eAllows full disk imaging with SR127 and 2\/3\" monochrome CCDs such as ICX625, ICX655, IMX250, IMX264.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFocal reducer specifications:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eFour elements in two groups.\u003c\/p\u003e\n\u003cp\u003e36mm clear aperture.\u003c\/p\u003e\n\u003cp\u003eFront: Male 2\" eyepiece drawtube.\u003c\/p\u003e\n\u003cp\u003eRear: Male T thread (M42x0.75)\u003c\/p\u003e\n\u003cp\u003eFlange to flange distance: 5mm.\u003c\/p\u003e\n\u003cp\u003eOverall length: 38mm.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eExtension tube specifications:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eFront: Female T-thread (M42x0.75)\u003c\/p\u003e\n\u003cp\u003eRear: Male T-thread (M42x0.75)\u003c\/p\u003e\n\u003cp\u003eFlange distance: 20mm\u003c\/p\u003e\n\u003cp\u003eOverall length: 25mm\u003c\/p\u003e\n\u003cp\u003eKnife edge baffles for superior contrast.\u003c\/p\u003e","brand":"Daystar Filters","offers":[{"title":"Default Title","offer_id":44014092877935,"sku":"FR2DT","price":399.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/FR2DT1__47102.jpg?v=1766570791"},{"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":"daystar-quark-visual-focal-reducer","title":"Daystar QUARK Visual Focal Reducer","description":"\u003cp\u003e\u003cspan\u003eDaystar is very excited to announce a NEW visual focal reducer designed to fit\u003c\/span\u003e\u003cspan\u003e our \u003c\/span\u003eDaystar Quark Hydrogen Alpha Filters\u003cspan\u003e. \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe Visual Focal Reducer screws in between the QUARK filter and the eyepiece drawtube. The focal length is reduced by a factor of approximately 0.8X, allowing a wider view, or allowing use of shorter than normal eyepieces. This also increases the brightness of the sun, which can make it easier to see faint prominences or increase the visible extent of a prominence.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eEyepieces with a field stop at or above the drawtube end will cause the reduction factor to be more extreme than 0.8X, which may lead to blurring at the edges of the field of view, or a constrained exit pupil with a narrow porthole effect. This porthole effect makes it difficult for novice users to locate their eye in the beam of light, so in public outreach applications it is important to choose eyepieces that give a wider cone of light. Many manufacturers do not publish an exit pupil specification, so we recommend experimentation with a variety of eyepieces to find the best match to your observing goals.\u003c\/span\u003e\u003c\/p\u003e","brand":"Daystar Filters","offers":[{"title":"Default Title","offer_id":44014125973615,"sku":"DS-VFR","price":284.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/0.8focalreducer__74284.jpg?v=1766572248"},{"product_id":"daystar-0-60x-tilt-reducer","title":"Daystar 0.60X Tilt Reducer","description":"\u003cp\u003eThis accessory is designed for use with our\u003cspan\u003e \u003c\/span\u003eDaystar Combo Quark Hydrogen Alpha Filter. \u003c\/p\u003e\n\u003cp\u003eThe 0.60X Tilt Reducer includes optics to reduce the focal length by a factor of 0.6x, allowing smaller image sensor cameras to capture more of the sun in the field of view. It is also designed for 17.5mm backfocus cameras, or 12.5mm in combination with the 5mm spacer. It also brightens the image, allowing shorter exposure times that do a better job of freezing the seeing, which can then be sorted for best sharpness with software. Exposure times will be approximately one third as long as without the reducer.\u003c\/p\u003e\n\u003cp\u003eThe Daystar 0.60X Tilt Reducer also includes the tilt feature to help remove any interference fringes.\u003c\/p\u003e","brand":"Daystar Filters","offers":[{"title":"Default Title","offer_id":44014126628975,"sku":"DS-0.6","price":429.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/60XReducerTilt500__03649.jpg?v=1766572258"},{"product_id":"daystar-0-33x-tilt-reducer","title":"Daystar 0.33X Tilt Reducer","description":"\u003cp\u003eThis accessory is designed for use with our\u003cspan\u003e \u003c\/span\u003eDaystar Combo Quark Hydrogen Alpha Filter. \u003c\/p\u003e\n\u003cp\u003eOur most powerful focal reducer, the 0.33X Tilt Reducer allows smaller image sensors to still fit the maximum field of view possible. Depending on telescope focal length, full disk imaging may by possible even with small sensors. Exposure times will be approximately  one ninth as long as without the reducer. Due to the faster focal ratio, the interference fringes are reduced, so little to no tilt may be required. \u003c\/p\u003e\n\u003cp\u003eThe Daystar 0.33X is also designed for 17.5mm backfocus cameras, or 12.5mm in combination with the 5mm spacer.\u003c\/p\u003e","brand":"Daystar Filters","offers":[{"title":"Default Title","offer_id":44014126792815,"sku":"DS-.33","price":499.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/33XReducerTilt__03692.jpg?v=1766572263"},{"product_id":"william-optics-ultra-flat-132-0-79x-reducer","title":"William Optics Ultra Flat 132 0.79x Reducer","description":"\u003cp\u003eThe \u003cstrong\u003eWilliam Optics Ultra Flat 132\u003c\/strong\u003e is a 0.79x reducer-flattener built as the matched corrector for the William Optics Fluorostar 132. It is a three-element, three-group design with a 137.5 mm optical length, an M92 x 1 telescope-side thread, and an M54 x 0.75 camera-side thread. On the Fluorostar 132 it delivers a corrected image circle of 43.2 mm at 55 mm of backfocus, and it weighs 1096 g.\u003c\/p\u003e\n\n\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThis is a good match if you already own — or are ordering — a Fluorostar 132 and intend to image with it. It is the corrector that pairs with that telescope, so the decision is less about choosing between flatteners and more about whether you want the 0.79x reduced configuration rather than the native focal length.\u003c\/p\u003e\n\u003cp\u003eIt suits a deep-sky imaging rig running a full-frame or APS-C camera. Setting it up is refreshingly direct: the supplied PVC gasket sets the 55 mm spacing on the Fluorostar 132, so there is no adjustment ring to dial in and no trial-and-error before your first session.\u003c\/p\u003e\n\n\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003e0.79x reduction:\u003c\/strong\u003e multiplies the native focal length and focal ratio of the Fluorostar 132 by 0.79. Because focal ratio scales linearly and light-gathering per unit area scales with its square, the reduced configuration collects roughly 1.6x more light per unit time (1 \/ 0.79²) than the native configuration.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e3 groups, 3 elements:\u003c\/strong\u003e a three-element corrector group, each element air-spaced as its own group.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e137.5 mm optical length:\u003c\/strong\u003e the corrector's own contribution to the imaging train, before your camera spacing. This is a long assembly — nearly twice the optical length of the Ultra Flat 156 — so account for it when planning the train.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eM92 x 1 x 6.5 mm telescope thread:\u003c\/strong\u003e threads directly to the Fluorostar 132 focuser drawtube — no push-fit, no adapter.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eM54 x 0.75 x 4 mm camera thread:\u003c\/strong\u003e the camera-side interface from which 55 mm of backfocus is measured.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e43.2 mm corrected image circle:\u003c\/strong\u003e on the Fluorostar 132, covering a full-frame sensor (43.3 mm diagonal).\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e1096 g:\u003c\/strong\u003e plan your focuser load and any rotator or filter wheel accordingly.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003e\u003cstrong\u003eOptical \/ Mechanical Design\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eA reducer-flattener does two jobs at once. Fast refractors of this aperture project a field that is curved rather than flat — stars that focus sharply at the centre fall progressively out of focus toward the edges, because the natural focal surface is a shallow bowl rather than a plane, and your sensor is a plane. The corrector group flattens that surface onto the sensor. The 0.79x element compresses the image scale at the same time, shortening the effective focal length and lowering the focal ratio, which shortens the exposure needed for a given signal.\u003c\/p\u003e\n\u003cp\u003eThe three-element, three-group construction is what allows both corrections to be made without reintroducing colour error at the edges. The consequence is that spacing tolerance drives corner star quality: the design is computed for one specific separation between the M54 thread and your sensor. Under-space it and corner stars elongate radially; over-space it and they elongate tangentially. The centre of the frame looks fine either way, which is why the corners are the place to check your work — and why the supplied gasket, which sets the spacing for you on the Fluorostar 132, is worth using as directed.\u003c\/p\u003e\n\n\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eDeep-sky astrophotography with a Fluorostar 132 in its reduced 0.79x configuration\u003c\/li\u003e\n  \u003cli\u003eFull-frame and APS-C cooled camera imaging where a flat field to the corners is required\u003c\/li\u003e\n  \u003cli\u003eWider framing than the Fluorostar 132 delivers natively — larger nebulae, extended galaxy fields\u003c\/li\u003e\n  \u003cli\u003eShorter sub-exposures at the same signal level, useful under mediocre guiding or shorter imaging windows\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eWilliam Optics publishes this corrector as the match for the \u003cstrong\u003eFluorostar 132\u003c\/strong\u003e. On the Fluorostar 132 it requires \u003cstrong\u003e55 mm of backfocus\u003c\/strong\u003e and needs \u003cstrong\u003eno adjustment\u003c\/strong\u003e — set the spacing with the supplied PVC gasket as directed. Backfocus is measured from the M54 x 0.75 camera-side thread to your sensor plane, and the total must account for every component in the train: filter drawer or filter wheel, off-axis guider, rotator, and the camera's own sensor-to-flange distance.\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/Flattener_back_focus-04.jpg?v=1784224665\" alt=\"William Optics flattener back focus diagram showing the 55 mm spacing measured from the M54 camera-side thread of the Ultra Flat 132\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\n\u003cp\u003eThe telescope side is \u003cstrong\u003eM92 x 1\u003c\/strong\u003e, threading straight to the Fluorostar 132. The camera side is \u003cstrong\u003eM54 x 0.75\u003c\/strong\u003e; most cooled astronomy cameras present an M48 or T2 interface, so confirm what your specific camera and filter hardware need to reach M54 and budget that adapter's optical length within the 55 mm figure — not on top of it. If you are not sure what your train adds up to, send us your camera and filter setup and we will work it out with you.\u003c\/p\u003e\n\u003cp\u003eWilliam Optics also publishes a back focus adjustment guide for the Ultra Flat series. If you are matching a different William Optics telescope, contact us before ordering — the Fluorostar 156 uses the \u003ca href=\"\/products\/william-optics-ultra-flat-156-0-79x-reducer\"\u003eUltra Flat 156\u003c\/a\u003e, and the Fluorostar 132 is also listed as compatible with the FLAT 68III, FLAT 7A, and FLAT 8 correctors at their own respective reduction factors.\u003c\/p\u003e\n\n\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eImaging accessory:\u003c\/strong\u003e this is an optical corrector for astrophotography. It has no application in a visual train with an eyepiece.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMatched to the Fluorostar 132:\u003c\/strong\u003e the 43.2 mm image circle and 55 mm backfocus are the figures William Optics publishes for that telescope. Other William Optics refractors pair with their own correctors — if you are matching a different model, get in touch and we will confirm the right one.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSpacing matters:\u003c\/strong\u003e corner star shape depends on hitting the 55 mm backfocus. On the Fluorostar 132 the supplied PVC gasket sets it, with no further adjustment needed.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCamera-side adapter:\u003c\/strong\u003e the corrector presents M54 x 0.75, while most cooled cameras and filter wheels use M48 or T2. An adapter is usually needed and is sold separately — its optical length counts toward the 55 mm, not on top of it. We can help you identify the right one for your camera.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSensor coverage:\u003c\/strong\u003e the 43.2 mm corrected circle on the Fluorostar 132 covers a full-frame sensor (43.3 mm diagonal). William Optics lists this corrector for APS-C and full frame.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOptical length:\u003c\/strong\u003e at 137.5 mm this is a long corrector — worth checking against your focuser travel and any dew shield or clearance constraints.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003e\u003cstrong\u003eFrequently Asked Questions\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eWhat telescope does this work with?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eWilliam Optics lists it as the matched corrector for the Fluorostar 132, with a 43.2 mm image circle at 55 mm backfocus and no adjustment required.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs it difficult to set up?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eNo. On the Fluorostar 132 it threads straight to the M92 drawtube and the supplied PVC gasket sets the 55 mm spacing for you — there is no adjustment ring to dial in and no trial-and-error. The main thing to get right is the total distance from the M54 thread to your sensor, and we are happy to check that with you before you order.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan I use it for visual observing?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eNo. It is a reducer-flattener for imaging. It has no place in a visual train.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat backfocus do I need?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e55 mm, measured from the M54 x 0.75 camera-side thread to your sensor plane. Use the supplied PVC gasket as directed; the Fluorostar 132 pairing requires no further adjustment.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWill it cover a full-frame sensor?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eYes. The published corrected image circle on the Fluorostar 132 is 43.2 mm, and a full-frame sensor has a 43.3 mm diagonal — so the corrected field is sized to full frame. William Optics lists the camera format as APS-C and full frame.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the difference between this and the Ultra Flat 156?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eBoth are 0.79x correctors, but they are computed for different telescopes: the Ultra Flat 132 is matched to the Fluorostar 132 and the Ultra Flat 156 to the Fluorostar 156. They also differ mechanically — 137.5 mm optical length here versus 75.5 mm on the 156. They are not interchangeable.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDo I need any additional adapters?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eVery likely on the camera side. The corrector presents M54 x 0.75; most cooled cameras and filter wheels use M48 or T2. Any adapter you add consumes part of the 55 mm backfocus budget. Tell us what camera you are running and we will point you to the right adapter.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDoes it change my focal length?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eYes — it multiplies the native focal length and focal ratio of the Fluorostar 132 by 0.79, which widens the field and shortens the exposure needed for a given signal.\u003c\/p\u003e\n\n\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eIn short: the matched 0.79x reducer-flattener for the Fluorostar 132. It threads on at M92, presents M54 to your camera, needs 55 mm of backfocus with the supplied gasket, and delivers a flat 43.2 mm field sized to a full-frame sensor. Spacing is the one figure worth measuring carefully — the corners are where it shows.\u003c\/p\u003e\n\n\u003ch3\u003e\u003cstrong\u003eOptical Diagram Reports\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eWilliam Optics publishes measured diagram reports for the Ultra Flat 132 on the Fluorostar 132. These show the corrected performance across the field rather than a marketing claim about it.\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/FLT-132_Flat132-Diagram-1.jpg?v=1784224665\" alt=\"William Optics Ultra Flat 132 optical test diagram report for the Fluorostar 132 imaging system\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/FLT-132_Flat132-Diagram-2.jpg?v=1784224665\" alt=\"William Optics Ultra Flat 132 spot diagram report showing corrected star images across the 43.2 mm image circle\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e","brand":"William Optics","offers":[{"title":"Default Title","offer_id":53154243149935,"sku":"P-FLAT132","price":1474.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/william-optics-ultra-flat-132.jpg?v=1779654809"},{"product_id":"william-optics-ultra-flat-156-0-79x-reducer","title":"William Optics Ultra Flat 156 0.79x Reducer","description":"\u003cp\u003eThe \u003cstrong\u003eWilliam Optics Ultra Flat 156\u003c\/strong\u003e is a 0.79x reducer-flattener built as the matched corrector for the William Optics Fluorostar 156. It is a three-element, three-group design with a 75.5 mm optical length, an M92 x 1 telescope-side thread, and an M54 x 0.75 camera-side thread. On the Fluorostar 156 it delivers a corrected image circle of 43.2 mm at 55 mm of backfocus, and it weighs 1202 g.\u003c\/p\u003e\n\n\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThis is a good match if you already own — or are ordering — a Fluorostar 156 and intend to image with it. It is the corrector that pairs with that telescope, so the decision is less about choosing between flatteners and more about whether you want the 0.79x reduced configuration rather than the native focal length.\u003c\/p\u003e\n\u003cp\u003eIt suits a permanent or semi-permanent deep-sky imaging rig running a full-frame or APS-C camera. At 1202 g on top of a 156 mm refractor, this is not a travel-weight combination. Setting it up is refreshingly direct: the supplied PVC gasket sets the 55 mm spacing on the Fluorostar 156, so there is no trial-and-error to work through before your first session.\u003c\/p\u003e\n\n\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003e0.79x reduction:\u003c\/strong\u003e multiplies the native focal length and focal ratio of the Fluorostar 156 by 0.79. Because focal ratio scales linearly and light-gathering per unit area scales with its square, the reduced configuration collects roughly 1.6x more light per unit time (1 \/ 0.79²) than the native configuration.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e3 groups, 3 elements:\u003c\/strong\u003e a three-element corrector group, each element air-spaced as its own group.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e75.5 mm optical length:\u003c\/strong\u003e the corrector's own contribution to the imaging train, before your camera spacing.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eM92 x 1 x 6.5 mm telescope thread:\u003c\/strong\u003e threads directly to the Fluorostar 156 focuser drawtube — no push-fit, no adapter.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eM54 x 0.75 x 4 mm camera thread:\u003c\/strong\u003e the camera-side interface from which 55 mm of backfocus is measured.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e43.2 mm corrected image circle:\u003c\/strong\u003e on the Fluorostar 156, covering a full-frame sensor (43.3 mm diagonal).\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e1202 g:\u003c\/strong\u003e plan your focuser load and any rotator or filter wheel accordingly.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003e\u003cstrong\u003eOptical \/ Mechanical Design\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eA reducer-flattener does two jobs at once. Fast refractors of this aperture project a field that is curved rather than flat — stars that focus sharply at the centre fall progressively out of focus toward the edges, because the natural focal surface is a shallow bowl rather than a plane, and your sensor is a plane. The corrector group flattens that surface onto the sensor. The 0.79x element compresses the image scale at the same time, shortening the effective focal length and lowering the focal ratio, which shortens the exposure needed for a given signal.\u003c\/p\u003e\n\u003cp\u003eThe three-element, three-group construction is what allows both corrections to be made without reintroducing colour error at the edges. The consequence is that spacing tolerance drives corner star quality: the design is computed for one specific separation between the M54 thread and your sensor. Under-space it and corner stars elongate radially; over-space it and they elongate tangentially. The centre of the frame looks fine either way, which is why the corners are the place to check your work — and why the supplied gasket, which sets the spacing for you on the Fluorostar 156, is worth using as directed.\u003c\/p\u003e\n\n\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eDeep-sky astrophotography with a Fluorostar 156 in its reduced 0.79x configuration\u003c\/li\u003e\n  \u003cli\u003eFull-frame and APS-C cooled camera imaging where a flat field to the corners is required\u003c\/li\u003e\n  \u003cli\u003eWider framing than the Fluorostar 156 delivers natively — larger nebulae, extended galaxy fields\u003c\/li\u003e\n  \u003cli\u003eShorter sub-exposures at the same signal level, useful under mediocre guiding or shorter imaging windows\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eWilliam Optics publishes this corrector as the match for the \u003cstrong\u003eFluorostar 156\u003c\/strong\u003e. On the Fluorostar 156 it requires \u003cstrong\u003e55 mm of backfocus\u003c\/strong\u003e and needs \u003cstrong\u003eno adjustment\u003c\/strong\u003e — set the spacing with the supplied PVC gasket as directed. Backfocus is measured from the M54 x 0.75 camera-side thread to your sensor plane, and the total must account for every component in the train: filter drawer or filter wheel, off-axis guider, rotator, and the camera's own sensor-to-flange distance.\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/Flattener_back_focus-02.jpg?v=1784220246\" alt=\"William Optics flattener back focus diagram showing the 55 mm spacing measured from the M54 camera-side thread of the Ultra Flat 156\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\n\u003cp\u003eThe telescope side is \u003cstrong\u003eM92 x 1\u003c\/strong\u003e, threading straight to the Fluorostar 156. The camera side is \u003cstrong\u003eM54 x 0.75\u003c\/strong\u003e; most cooled astronomy cameras present an M48 or T2 interface, so confirm what your specific camera and filter hardware need to reach M54 and budget that adapter's optical length within the 55 mm figure — not on top of it. If you are not sure what your train adds up to, send us your camera and filter setup and we will work it out with you.\u003c\/p\u003e\n\u003cp\u003eWilliam Optics also publishes a back focus adjustment guide for the Ultra Flat series. If you are unsure which corrector matches a different William Optics telescope, contact us before ordering — the Fluorostar 132 uses the \u003ca href=\"\/products\/william-optics-ultra-flat-132-0-79x-reducer\"\u003eUltra Flat 132\u003c\/a\u003e, and the Fluorostar 156 is also listed as compatible with the FLAT 68III, FLAT 7A, and FLAT 8 correctors at their own respective reduction factors.\u003c\/p\u003e\n\n\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eImaging accessory:\u003c\/strong\u003e this is an optical corrector for astrophotography. It has no application in a visual train with an eyepiece.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMatched to the Fluorostar 156:\u003c\/strong\u003e the 43.2 mm image circle and 55 mm backfocus are the figures William Optics publishes for that telescope. Other William Optics refractors pair with their own correctors — if you are matching a different model, get in touch and we will confirm the right one.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSpacing matters:\u003c\/strong\u003e corner star shape depends on hitting the 55 mm backfocus. On the Fluorostar 156 the supplied PVC gasket sets it, with no further adjustment needed.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCamera-side adapter:\u003c\/strong\u003e the corrector presents M54 x 0.75, while most cooled cameras and filter wheels use M48 or T2. An adapter is usually needed and is sold separately — its optical length counts toward the 55 mm, not on top of it. We can help you identify the right one for your camera.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSensor coverage:\u003c\/strong\u003e the 43.2 mm corrected circle on the Fluorostar 156 covers a full-frame sensor (43.3 mm diagonal). Medium-format sensors are larger than that circle.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e at 1202 g it is worth accounting for in your focuser load and mount payload once the camera is attached.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003e\u003cstrong\u003eFrequently Asked Questions\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eWhat telescope does this work with?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eWilliam Optics lists it as the matched corrector for the Fluorostar 156, with a 43.2 mm image circle at 55 mm backfocus and no adjustment required.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs it difficult to set up?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eNo. On the Fluorostar 156 it threads straight to the M92 drawtube and the supplied PVC gasket sets the 55 mm spacing for you — there is no adjustment ring to dial in and no trial-and-error. The main thing to get right is the total distance from the M54 thread to your sensor, and we are happy to check that with you before you order.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan I use it for visual observing?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eNo. It is a reducer-flattener for imaging. It has no place in a visual train.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat backfocus do I need?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e55 mm, measured from the M54 x 0.75 camera-side thread to your sensor plane. Use the supplied PVC gasket as directed; the Fluorostar 156 pairing requires no further adjustment.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWill it cover a full-frame sensor?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe published corrected image circle on the Fluorostar 156 is 43.2 mm. A full-frame sensor has a 43.3 mm diagonal, so the corrected field is sized to full frame. Larger medium-format sensors are outside that circle.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the difference between this and the Ultra Flat 132?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eBoth are 0.79x correctors, but they are computed for different telescopes: the Ultra Flat 132 is matched to the Fluorostar 132 and the Ultra Flat 156 to the Fluorostar 156. They are not interchangeable.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDo I need any additional adapters?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eVery likely on the camera side. The corrector presents M54 x 0.75; most cooled cameras and filter wheels use M48 or T2. Any adapter you add consumes part of the 55 mm backfocus budget. Tell us what camera you are running and we will point you to the right adapter.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDoes it change my focal length?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eYes — it multiplies the native focal length and focal ratio of the Fluorostar 156 by 0.79, which widens the field and shortens the exposure needed for a given signal.\u003c\/p\u003e\n\n\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eIn short: the matched 0.79x reducer-flattener for the Fluorostar 156. It threads on at M92, presents M54 to your camera, needs 55 mm of backfocus with the supplied gasket, and delivers a flat 43.2 mm field sized to a full-frame sensor. Spacing is the one figure worth measuring carefully — the corners are where it shows.\u003c\/p\u003e\n\n\u003ch3\u003e\u003cstrong\u003eOptical Diagram Reports\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eWilliam Optics publishes measured diagram reports for the Ultra Flat 156 on the Fluorostar 156. These show the corrected performance across the field rather than a marketing claim about it.\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/FLT-156_Flat156-Diagram-1.jpg?v=1784220248\" alt=\"William Optics Ultra Flat 156 optical test diagram report for the Fluorostar 156 imaging system\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/FLT-156_Flat156-Diagram-2.jpg?v=1784220246\" alt=\"William Optics Ultra Flat 156 spot diagram report showing corrected star images across the 43.2 mm image circle\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e","brand":"William Optics","offers":[{"title":"Default Title","offer_id":53154243870831,"sku":"P-FLAT156","price":1474.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/william-optics-ultra-flat-156.jpg?v=1779654823"},{"product_id":"william-optics-flat-8-0-72x-reducer","title":"William Optics FLAT 8 0.72x Reducer","description":"\u003cp\u003eThe \u003cstrong\u003eWilliam Optics FLAT 8\u003c\/strong\u003e is a premium 0.72x reducer\/flattener for compatible William Optics refractors. It is designed to significantly reduce focal length, speed up the optical system, and help deliver a corrected imaging field for deep-sky astrophotography.\u003c\/p\u003e\u003ch2\u003eWho Is This Product Best For?\u003c\/h2\u003e\u003cp\u003eBest for astrophotographers using compatible William Optics refractors who want a wider field of view and faster imaging speed than a standard 0.8x reducer.\u003c\/p\u003e\u003ch2\u003eWhy Choose This Product?\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e0.72x reduction:\u003c\/strong\u003e Creates a wider, faster imaging system.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eField correction:\u003c\/strong\u003e Helps improve star shape across the frame.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eImaging-focused design:\u003c\/strong\u003e Built for deep-sky camera systems.\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 nebula imaging\u003c\/li\u003e\n\u003cli\u003eCompatible full-frame imaging systems\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eCompatibility and Accessory Notes\u003c\/h2\u003e\u003cp\u003eConfirm telescope compatibility, required adapter, camera thread, and backfocus spacing before imaging.\u003c\/p\u003e\u003ch2\u003eImportant Limitations\u003c\/h2\u003e\u003cp\u003eThis is an imaging accessory and requires precise spacing for best star correction.\u003c\/p\u003e\u003ch2\u003eOur Recommendation\u003c\/h2\u003e\u003cp\u003eChoose the FLAT 8 when your compatible William Optics refractor needs aggressive 0.72x focal reduction for wider and faster deep-sky imaging.\u003c\/p\u003e","brand":"William Optics","offers":[{"title":"Default Title","offer_id":53154246000751,"sku":"P-FLAT8","price":1336.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/william-optics-flat-8-reducer.jpg?v=1779654847"},{"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":"explore-scientific-0-8x-focal-reducer-f5-to-f7-refractors","title":"Explore Scientific 0.8x Focal Reducer for f\/5 to f\/7 Refractors with 55mm Back Spacing","description":"\u003ch2\u003eProduct Overview\u003c\/h2\u003e\u003cp\u003eThe Explore Scientific ES-FR0.8x is a two-element 0.8x focal reducer made for refractors working between roughly f\/5 and f\/7. It multiplies your telescope's focal length by 0.8, which shortens the focal length, speeds up the focal ratio and widens the field your camera records. Explore Scientific gives two worked examples: a 480mm f\/6 refractor becomes 384mm at f\/4.8, and a 714mm f\/7 refractor becomes 571mm at f\/5.6. It threads into a standard 42mm T-ring and works at 55mm of back spacing, plus or minus 2mm, which is the same nominal spacing used by most T-ring and camera combinations in astrophotography.\u003c\/p\u003e\u003ch2\u003eWho It's For\u003c\/h2\u003e\u003cp\u003eThis is for the imager who likes their refractor but wants more sky in the frame and shorter exposures to get it. A reducer solves a framing and speed problem: the target does not fit, or it fits so tightly that there is nothing left for composition, or the sub-exposures are long enough that guiding errors and satellite trails start eating your night. Dropping from f\/6 to f\/4.8 collects the same signal in noticeably less time, and the wider field turns large emission nebulae and open clusters from crops into portraits.\u003c\/p\u003e\u003cp\u003eIt is worth being blunt about what this is not. A focal reducer and a coma corrector are not interchangeable, and buying one when you needed the other leaves you with the wrong tool entirely. A coma corrector fixes off-axis coma, the seagull-shaped stars at the edge of the frame that fast Newtonian reflectors produce, and it does not meaningfully widen your field. This reducer is the opposite errand: it is for refractors, it changes focal length and focal ratio, and it is about framing and exposure time rather than repairing a specific aberration of a mirror telescope. If you shoot with a fast Newtonian, you want a coma corrector. If you shoot with an f\/5 to f\/7 refractor and want a wider, faster field, you want this.\u003c\/p\u003e\u003ch2\u003eKey Features and Design\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e0.8x reduction factor, shortening focal length and speeding the focal ratio by the same proportion\u003c\/li\u003e\n\u003cli\u003eTwo-element optical design\u003c\/li\u003e\n\u003cli\u003eBack spacing of 55mm, plus or minus 2mm, the standard working distance for most T-ring and camera stacks\u003c\/li\u003e\n\u003cli\u003eAccepts a standard 42mm T-ring, so it drops into the usual imaging train rather than demanding proprietary adapters\u003c\/li\u003e\n\u003cli\u003eIntended for refractors in the f\/5 to f\/7 range\u003c\/li\u003e\n\u003cli\u003eExplore Scientific publishes worked conversions of 480mm to 384mm, taking f\/6 to f\/4.8, and 714mm to 571mm, taking f\/7 to f\/5.6\u003c\/li\u003e\n\u003cli\u003eListed by Explore Scientific for the ES-ED0806-02, ES-ED10207-02, FCD100-0806-02, FCD100-10207-02 and FCD100-10207-CF-01 telescopes\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eOptical Design\u003c\/h2\u003e\u003cp\u003eA focal reducer sits in the converging light cone behind the objective and adds negative-to-positive optical power that brings the focus in closer, shortening the effective focal length. Because the aperture has not changed, a shorter focal length means a smaller focal ratio number, and the image scale on the sensor shrinks by the same 0.8 factor, so more sky lands on the same chip. The illumination per square millimetre of sensor rises as the square of the change in focal ratio, which is why a 0.8x reducer is often described as making a telescope roughly one and a half times faster in exposure terms. The 55mm back spacing is not a suggestion. Reducers only deliver their designed correction at one working distance, and drifting away from it changes the effective reduction and pushes stars in the corners out of round. Explore Scientific quotes a tolerance of plus or minus 2mm, which is tight enough that you should measure your spacers rather than estimate them. The two-element construction keeps the glass count and the light loss low, and it also keeps the reducer short enough not to swallow an unreasonable amount of your focuser's back focus.\u003c\/p\u003e\u003ch2\u003eRecommended Uses\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eWide-field deep-sky imaging with an f\/5 to f\/7 apochromatic or ED refractor\u003c\/li\u003e\n\u003cli\u003eShortening exposure times on faint, extended targets such as large emission nebulae\u003c\/li\u003e\n\u003cli\u003eFraming large objects that do not fit the native field of your refractor\u003c\/li\u003e\n\u003cli\u003eReducing the demand on your guiding by cutting sub-exposure length\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eCompatibility and Accessory Notes\u003c\/h2\u003e\u003cp\u003eExplore Scientific lists this reducer for its ES-ED0806-02, ES-ED10207-02, FCD100-0806-02, FCD100-10207-02 and FCD100-10207-CF-01 refractors, and describes it more generally as suiting f\/5 to f\/7 refractors. You will need a 42mm T-ring for your camera body, and you will need to build the imaging train so that the sensor sits 55mm behind the reducer, which usually means the T-ring plus one or more spacer rings depending on your camera's flange distance. Cooled astronomy cameras with built-in filter drawers and off-axis guiders complicate that arithmetic, so it is worth working out the numbers before you order. Send us your telescope and camera model and our team in Bolton will confirm the spacing you need and whether this reducer suits your particular optical train.\u003c\/p\u003e\u003ch2\u003eGood to Know Before You Order\u003c\/h2\u003e\u003cp\u003eNo T-ring, spacers or camera adapters are included, and Explore Scientific does not publish a packing list for this item. This reducer is designed for refractors in a specific focal ratio band, and it is not a coma corrector for Newtonian reflectors, nor is it a substitute for one. The 55mm spacing tolerance of plus or minus 2mm is worth respecting, and if your back focus budget is already tight you should confirm the numbers before committing. Explore Scientific publishes no shipping weight for this item, so we are confirming it on our own scales before the listing goes live. That is why it is currently unpublished. Contact us and we will give you a shipping figure for your address.\u003c\/p\u003e\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eWill this correct coma in my Newtonian?\u003c\/strong\u003e No. Coma is an off-axis aberration of the parabolic mirror in a reflector and needs a coma corrector. This is a focal reducer for refractors, and it changes focal length and field width rather than repairing coma.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat does 55mm back spacing actually mean?\u003c\/strong\u003e It is the distance from the reducer's shoulder to your camera's sensor. Get it right and the correction is as designed. Drift outside the plus or minus 2mm tolerance and the reduction factor shifts and corner stars start to elongate.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I use it visually?\u003c\/strong\u003e It is designed and specified as an imaging accessory working to a 42mm T-ring at a defined sensor distance, so visual use is not what Explore Scientific specifies for it. If you want a wider visual field, a longer focal length eyepiece is the simpler answer.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes it work on telescopes outside the f\/5 to f\/7 range?\u003c\/strong\u003e Explore Scientific specifies f\/5 to f\/7 refractors and names five of its own models. Outside that band the correction may not hold across the field. Ask us and we will check your telescope against the specification.\u003c\/p\u003e\u003ch2\u003eBottom Line\u003c\/h2\u003e\u003cp\u003eIf you image with an f\/5 to f\/7 refractor and keep running out of frame, this two-element 0.8x reducer widens the field and speeds the system in one step, using standard 42mm T-ring threads and 55mm back spacing. Just make sure a reducer is what your telescope needs, because a fast Newtonian wants a coma corrector instead. Contact our team in Bolton and we will confirm the fit and the spacing for your setup.\u003c\/p\u003e","brand":"Explore Scientific","offers":[{"title":"Default Title","offer_id":53958593970287,"sku":"ES-FR0.8x","price":193.95,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/ES-FR0.8X_1_7c74a6f1-4013-4ce6-9df0-3c958a8967b3.jpg?v=1785960612"},{"product_id":"takahashi-reducer-coupling-fsq-106ed-camera-angle-a","title":"Takahashi Reducer Coupling for FSQ-106ED Camera Angle A","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe Reducer Coupling for FSQ-106ED Camera Angle A is a mechanical spacer built to seat the Mewlon CR \/ FSQ-106EDX4 0.73x Reducer inside the Camera Angle Adjuster on an FSQ-106ED telescope. It bridges the M92 and M72 thread interfaces of the CAA housing, positioning the reducer at the depth needed for infinity focus with Takahashi's standard TCA-4 and T-mount camera adapters.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis is a good match if you run an FSQ-106ED with the Camera Angle Adjuster and want to add the 0.73x reducer to that same imaging train without changing your camera-side adapters.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eM92-to-M72 coupling:\u003c\/strong\u003e bridges the reducer's thread to the Camera Angle Adjuster's housing thread.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePurpose-fit depth:\u003c\/strong\u003e positions the reducer inside the CAA at the spacing needed for infinity focus with standard TCA-4 and T-mount adapters.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSingle-purpose part:\u003c\/strong\u003e adds no optics of its own — it's a mechanical spacer only.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eAdding the 0.73x reducer to an FSQ-106ED imaging train that already runs through the Camera Angle Adjuster; CCD and DSLR imaging setups using Takahashi's TCA-4 or T-mount camera adapters.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eBuilt specifically for the FSQ-106ED's Camera Angle Adjuster and the Mewlon CR \/ FSQ-106EDX4 0.73x Reducer. It isn't a general-purpose coupling for other Takahashi reducers or camera angle adjusters. See the \u003ca href=\"\/pages\/takahashi-back-focus-guide\"\u003eTakahashi Back Focus Guide\u003c\/a\u003e for the rest of the FSQ-106ED imaging train's published spacing figures.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eIt's built for one specific combination.\u003c\/strong\u003e It couples the 0.73x reducer to the FSQ-106ED's Camera Angle Adjuster and isn't sized for other reducer or CAA pairings.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eFrequently Asked Questions\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eIs it difficult to set up?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNo — it threads between the reducer and the Camera Angle Adjuster housing like any coupling.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is it best used for?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eFitting the 0.73x reducer inside an FSQ-106ED's Camera Angle Adjuster for CCD or DSLR imaging.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes it work with other reducers or telescopes?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eIt's matched specifically to the FSQ-106ED Camera Angle Adjuster and the 0.73x reducer, not a universal coupling.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDo I need other adapters?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eStandard TCA-4 or T-mount camera adapters complete the imaging train from this point.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eA purpose-built coupling that seats the 0.73x reducer inside the FSQ-106ED's Camera Angle Adjuster at the correct depth for infinity focus.\u003c\/p\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":54047080677487,"sku":"TAK-TKA36002","price":77.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/trdc0106_2_6.jpg?v=1786913058"},{"product_id":"takahashi-fct-65d-0-65x-fu-reducer","title":"Takahashi FCT-65D 0.65x FU Reducer","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe FCT-65D 0.65x FU Reducer is Takahashi's dedicated fluorite focal reducer for the FCT-65D refractor. It brings the telescope's native 400mm f\/6.2 down to 260mm at f\/4.0, and two of its elements are fluorite glass — the material that lets Takahashi push a reduction this aggressive while still holding a flat Φ44mm image circle.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis reducer suits FCT-65D owners imaging wide star fields, nebulae, and comets who want the fastest focal ratio the telescope supports. At f\/4.0 it gathers roughly 2.4x the light of the native f\/6.2 setup for the same exposure time.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFluorite reducer elements:\u003c\/strong\u003e control the chromatic error a reduction this strong would otherwise introduce.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e0.65x reduction:\u003c\/strong\u003e takes the FCT-65D from 400mm f\/6.2 to 260mm f\/4.0.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eΦ44mm corrected image circle:\u003c\/strong\u003e covers a full APS-C sensor with sharp stars into the corners.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eM55.9 thread mount:\u003c\/strong\u003e installs directly into the FCT-65D drawtube system.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eOptical \/ Mechanical Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe reducer sits mostly inside the FCT-65D's drawtube, so the aggressive 0.65x reduction adds little to the telescope's front-to-back balance. It pairs with the included CA-35 (FURD) spacing ring, which sets a fixed back focus of 56.0mm measured from the rear of the adapter rather than from the telescope's own focal plane — the figure to build your imaging train from. See the \u003ca href=\"\/pages\/takahashi-back-focus-guide\"\u003eTakahashi Back Focus Guide\u003c\/a\u003e for the full spacing chain.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eWide-field deep-sky imaging of nebulae, clusters, and large galaxies; comet photography where a fast focal ratio shortens the exposures needed on a moving target; general FCT-65D astrophotography where exposure time is at a premium.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eTelescope\u003c\/th\u003e\n\u003cth\u003eResulting focal length\u003c\/th\u003e\n\u003cth\u003eResulting focal ratio\u003c\/th\u003e\n\u003cth\u003eImage circle\u003c\/th\u003e\n\u003cth\u003eBack focus\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFCT-65D\u003c\/td\u003e\n\u003ctd\u003e260mm\u003c\/td\u003e\n\u003ctd\u003ef\/4.0\u003c\/td\u003e\n\u003ctd\u003eΦ44mm\u003c\/td\u003e\n\u003ctd\u003e56.0mm (from rear of adapter)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003cp\u003eThe CA-35 (FURD) spacing ring ships with the reducer and fixes the 56.0mm figure above. Camera-side spacing from there follows your camera's own flange distance — the \u003ca href=\"\/pages\/takahashi-back-focus-guide\"\u003eTakahashi Back Focus Guide\u003c\/a\u003e covers the full chain.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eBuilt specifically for the FCT-65D:\u003c\/strong\u003e the figures above are for that telescope only — other Takahashi refractors pair with their own dedicated reducers.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eFrequently Asked Questions\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eIs it difficult to set up?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNo — it threads into the FCT-65D drawtube along with the included CA-35 spacing ring, and the 56.0mm back focus figure is fixed by that ring rather than something you measure and adjust yourself.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is it best used for?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eWide-field astrophotography on the FCT-65D, where the 0.65x reduction to f\/4.0 shortens exposures on nebulae, clusters, and comets.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes it work for visual observing?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNo — it's built to deliver a flat photographic image circle rather than a visual, eyepiece-compatible path.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat else do I need with it?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eThe CA-35 (FURD) spacing ring, included with the reducer, and your camera's own T-ring or adapter to complete the 56.0mm back focus.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eA dedicated fluorite reducer that takes the FCT-65D to 260mm at f\/4.0 with a flat Φ44mm image circle, set up with the included CA-35 ring at a fixed 56.0mm back focus.\u003c\/p\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":54047107907695,"sku":"TAK-TKA11580F","price":1072.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/tka11580f.jpg?v=1786913880"},{"product_id":"takahashi-fc-76dp-0-64x-fu-reducer","title":"Takahashi FC-76DP 0.64x FU Reducer","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe FC-76DP 0.64x FU Reducer is Takahashi's dedicated fluorite focal reducer for the FC-76DP refractor. It brings the telescope's native 570mm f\/7.5 down to 365mm at f\/4.8, using fluorite elements to keep chromatic error under control at this level of reduction.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis reducer suits FC-76DP owners who image both wide fields and tighter deep-sky targets and want a faster focal ratio without giving up the telescope's sharp, high-contrast optics. Takahashi's own spot-radius figures for this combination run about 1.5 microns across APS-C and under 2 microns even at the edge of full frame.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFluorite reducer elements:\u003c\/strong\u003e hold chromatic error in check through the 0.64x reduction.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e0.64x reduction:\u003c\/strong\u003e takes the FC-76DP from 570mm f\/7.5 to 365mm f\/4.8.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eΦ44mm corrected image circle:\u003c\/strong\u003e covers APS-C fully, with strong performance well into full-frame corners.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eM55.9 thread mount:\u003c\/strong\u003e installs directly into the FC-76DP drawtube system.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eOptical \/ Mechanical Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe reducer pairs with the included CA-35 (FURD) spacing ring, which sets a fixed back focus of 56.0mm measured from the rear of the adapter. That figure — not the telescope's native focal plane — is the one to build an imaging train from. See the \u003ca href=\"\/pages\/takahashi-back-focus-guide\"\u003eTakahashi Back Focus Guide\u003c\/a\u003e for the full spacing chain.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eDeep-sky imaging of nebulae, clusters, and galaxies at a fast f\/4.8; full-frame astrophotography where the wide, well-corrected image circle counts; general FC-76DP imaging where shorter exposures are worth the reduced focal length.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eTelescope\u003c\/th\u003e\n\u003cth\u003eResulting focal length\u003c\/th\u003e\n\u003cth\u003eResulting focal ratio\u003c\/th\u003e\n\u003cth\u003eImage circle\u003c\/th\u003e\n\u003cth\u003eBack focus\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFC-76DP\u003c\/td\u003e\n\u003ctd\u003e365mm\u003c\/td\u003e\n\u003ctd\u003ef\/4.8\u003c\/td\u003e\n\u003ctd\u003eΦ44mm\u003c\/td\u003e\n\u003ctd\u003e56.0mm (from rear of adapter)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003cp\u003eThe CA-35 (FURD) spacing ring ships with the reducer and fixes the 56.0mm figure above. Camera-side spacing from there follows your camera's own flange distance — full detail in the \u003ca href=\"\/pages\/takahashi-back-focus-guide\"\u003eTakahashi Back Focus Guide\u003c\/a\u003e.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eBuilt specifically for the FC-76DP:\u003c\/strong\u003e these figures don't carry over to the FC-76DCU or other FC siblings, which use their own reducers.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eFrequently Asked Questions\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eIs it difficult to set up?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNo — it threads into the FC-76DP drawtube with the included CA-35 spacing ring, and the 56.0mm back focus figure is fixed by that ring.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is it best used for?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eDeep-sky astrophotography on the FC-76DP at a fast f\/4.8, across both APS-C and full-frame sensors.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes it work for visual observing?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNo — it's built for a flat photographic image circle rather than a visual eyepiece path.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat else do I need with it?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eThe CA-35 (FURD) spacing ring, included with the reducer, and your camera's own T-ring or adapter to complete the 56.0mm back focus.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eA dedicated fluorite reducer that takes the FC-76DP to 365mm at f\/4.8 with a flat Φ44mm image circle, set up with the included CA-35 ring at a fixed 56.0mm back focus.\u003c\/p\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":54047109349487,"sku":"TAK-TKA18580F","price":1072.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/tka18580f-1.jpg?v=1786913900"},{"product_id":"takahashi-645-reducer-adapter-ring","title":"Takahashi 645 Reducer Adapter Ring","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis adapter ring — numbered \"Ring #82\" in Takahashi's 645-format system charts — is a fitting piece in Takahashi's medium-format reducer train, built around the 645 digital back format. It connects a telescope's output to the reducer side of that train.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis is what you need if you are assembling a 645-format reducer imaging train and the system chart for your telescope calls for this adapter.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e\n\u003cstrong\u003ePurpose-built for the 645 reducer system:\u003c\/strong\u003e one of the numbered adapter rings in Takahashi's 645-format parts list.\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e\n\u003cstrong\u003eMedium-format reducer imaging trains\u003c\/strong\u003e built around Takahashi's 645 system.\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eIf you are assembling a 645-format train and want to confirm this is the correct ring for your telescope, send us the model and we will check it against the system chart with you.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eFrequently Asked Questions\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eIs it difficult to set up?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eIt's a single ring in a numbered system chart — straightforward once you know which position it fills. Send us your telescope and reducer combination and we will confirm it's the right one.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes this include the 645 Reducer itself?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNo — this is the adapter ring only. The reducer optics are a separate purchase.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eIn short: a fitting ring within Takahashi's 645-format reducer system, numbered Ring #82 in Takahashi's system charts.\u003c\/p\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":54047109382255,"sku":"TAK-TKA36581","price":147.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/tka36581_3.jpg?v=1786913912"},{"product_id":"takahashi-aux-ring-for-645-reducer","title":"Takahashi AUX Ring for 645 Reducer","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis auxiliary ring fits into Takahashi's 645-format reducer imaging train, on the telescope side of the 645 Reducer. It is a fitting piece rather than an optical part — the reducer itself carries the correction.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis is what you need if you are assembling a 645-format reducer imaging train and your telescope's system chart calls for this auxiliary ring.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e\n\u003cstrong\u003eMedium-format reducer imaging trains\u003c\/strong\u003e built around Takahashi's 645 Reducer system.\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eIf you are assembling a 645-format train and want to confirm this is the correct ring for your telescope, send us the model and we will check it against the system chart with you.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eFrequently Asked Questions\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eIs it difficult to set up?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eIt's a single ring in the 645 Reducer system — straightforward once you know which position it fills. Send us your telescope and we will confirm it's the right one.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes this include the 645 Reducer itself?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNo — this is the auxiliary ring only. The reducer optics are a separate purchase.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eIn short: a fitting ring for the telescope side of Takahashi's 645 Reducer train.\u003c\/p\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":54047109775471,"sku":"TAK-TKA36582","price":156.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/tka36582_3.jpg?v=1786913963"},{"product_id":"takahashi-aux-ring-0-7x-645-reducer-for-toa-130-fsq-130ed","title":"Takahashi AUX Ring 0.7x 645 Reducer for TOA-130\/FSQ-130ED","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis auxiliary ring fits the 0.7x 645 Reducer to the TOA-130 and FSQ-130ED. It's the telescope-side fitting piece in Takahashi's 645-format reducer system — the reducer itself supplies the 0.7x optical correction and focal-length reduction.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis is what you need if you own a TOA-130 or FSQ-130ED and are fitting the 0.7x 645 Reducer for medium-format imaging.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e\n\u003cstrong\u003eMedium-format imaging on the TOA-130 or FSQ-130ED\u003c\/strong\u003e with the 0.7x 645 Reducer.\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis ring is specific to the TOA-130 and FSQ-130ED fitting of the 0.7x 645 Reducer system. Send us your telescope and reducer combination and we will confirm the fit before you order.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eFrequently Asked Questions\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eIs it difficult to set up?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eIt's a single fitting ring between the telescope and the 0.7x 645 Reducer — straightforward once the reducer is on hand. Send us your telescope and we will confirm it's the right one.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes this include the 0.7x 645 Reducer itself?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNo — this is the auxiliary ring only. The reducer optics are a separate purchase.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eIn short: the TOA-130\/FSQ-130ED fitting ring for Takahashi's 0.7x 645 Reducer.\u003c\/p\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":54047111577711,"sku":"TAK-TKA38206","price":199.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/screenshot_2026-08-26_at_2.00.51_pm.png?v=1787841798"},{"product_id":"takahashi-toa-130-0-7x-toa-35-reducer","title":"Takahashi TOA-130 0.7x TOA-35 Reducer","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe TOA-35 Reducer 130 Set pairs Takahashi's 0.7x TOA-35 reducer with a CA Ring 130 sized for the TOA-130NS and TOA-130NFB, cutting the telescope's native 1000mm f\/7.7 down to 698mm f\/5.4. The reducer is a 4-element, 3-group ED glass design shared across the whole TOA-35 line — what changes between kits is which CA ring is bundled to match the telescope it's going on.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis kit suits TOA-130NS and TOA-130NFB owners who want a materially faster focal ratio for deep-sky imaging without leaving the TOA series' ED apochromat optics. At f\/5.4 it cuts exposure times substantially versus the native f\/7.7 while holding a flat Φ44mm image circle.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e4 elements in 3 groups, ED glass:\u003c\/strong\u003e the same optical design used across every TOA-35 reducer kit.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e0.7x reduction:\u003c\/strong\u003e takes the TOA-130NS\/NFB from 1000mm f\/7.7 to 698mm f\/5.4.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eΦ44mm corrected image circle:\u003c\/strong\u003e flat, sharp field suited to APS-C and smaller full-frame crops.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBundled CA Ring 130:\u003c\/strong\u003e sized specifically for the TOA-130's mount, so the kit installs as a matched system.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eOptical \/ Mechanical Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe reducer threads to the CA Ring 130, which is what's bundled in this specific kit — the ring is what changes between TOA-35 Reducer kits, not the reducer optic itself. Back focus is 65.5mm on the TOA-130NS\/NFB. See the \u003ca href=\"\/pages\/takahashi-back-focus-guide\"\u003eTakahashi Back Focus Guide\u003c\/a\u003e for the full spacing chain.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eFaster deep-sky imaging on the TOA-130NS\/NFB where exposure time matters — nebulae, galaxies, and clusters that benefit from f\/5.4 over the native f\/7.7; general astrophotography where a shorter focal length better frames larger targets.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eTelescope\u003c\/th\u003e\n\u003cth\u003eResulting focal length\u003c\/th\u003e\n\u003cth\u003eResulting focal ratio\u003c\/th\u003e\n\u003cth\u003eImage circle\u003c\/th\u003e\n\u003cth\u003eBack focus\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTOA-130NS \/ TOA-130NFB (this kit)\u003c\/td\u003e\n\u003ctd\u003e698mm\u003c\/td\u003e\n\u003ctd\u003ef\/5.4\u003c\/td\u003e\n\u003ctd\u003eΦ44mm\u003c\/td\u003e\n\u003ctd\u003e65.5mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTOA-150B\u003c\/td\u003e\n\u003ctd\u003e775mm\u003c\/td\u003e\n\u003ctd\u003ef\/5.2\u003c\/td\u003e\n\u003ctd\u003eΦ44mm\u003c\/td\u003e\n\u003ctd\u003e62.5mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTSA-120\u003c\/td\u003e\n\u003ctd\u003e635mm\u003c\/td\u003e\n\u003ctd\u003ef\/5.3\u003c\/td\u003e\n\u003ctd\u003eΦ44mm\u003c\/td\u003e\n\u003ctd\u003e62.5mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003cp\u003eThis is the same 0.7x reducer optic used on the TOA-150B and TSA-120, but bundled here with the CA Ring 130 sized for the TOA-130's mount. TOA-150B and TSA-120 owners use the sibling kit, the \u003cstrong\u003eTOA-35 0.7x Reducer and Camera Ring (TOA-150, TSA-102\/120)\u003c\/strong\u003e, which bundles the identical reducer with the larger CA Ring 150 instead — the two kits are not interchangeable between telescopes even though the optic inside them is the same.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eSold as a matched kit:\u003c\/strong\u003e the CA Ring 130 is bundled with this reducer, so there's no separate ring to source for the TOA-130.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eFrequently Asked Questions\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eIs it difficult to set up?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNo — the reducer threads to the included CA Ring 130, which is sized to install directly on the TOA-130NS\/NFB.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is it best used for?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eDeep-sky astrophotography on the TOA-130NS\/NFB where the 0.7x reduction to f\/5.4 shortens exposures versus native f\/7.7.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this the same reducer as the TOA-150 kit?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eThe optic is identical. What differs is the bundled ring — this kit ships with CA Ring 130 for the TOA-130; the TOA-150\/TSA-120 kit ships with CA Ring 150 instead.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat else do I need with it?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eYour camera's own T-ring or adapter to complete the connection at the 65.5mm back focus figure.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eA matched TOA-35 reducer kit for the TOA-130NS\/NFB, cutting the telescope to 698mm at f\/5.4 across a Φ44mm image circle, with the CA Ring 130 included.\u003c\/p\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":54047112691823,"sku":"TAK-TKA31580NS","price":1495.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/tka31580ns_3.jpg?v=1786914087"},{"product_id":"takahashi-toa-150-tsa-120-0-7x-toa-35-reducer-and-camera-ring","title":"Takahashi TOA-150 \/ TSA-120 0.7x TOA-35 Reducer and Camera Ring","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe TOA-35 Reducer 150 Set pairs Takahashi's 0.7x TOA-35 reducer with a CA Ring 150 sized for the TOA-150B and TSA-120\/TSA-102, cutting these telescopes to a materially faster focal ratio while holding a flat Φ44mm image circle. The reducer is the same 4-element, 3-group optic used across the whole TOA-35 line — this kit's CA Ring 150 is what makes it fit the TOA-150 and TSA-120 mounts specifically, and it's the reason a camera ring is called out explicitly in this listing's title.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis kit suits TOA-150B and TSA-120 (and TSA-102) owners who want a faster imaging focal ratio without leaving the ED apochromat optics those telescopes are built around. On the TOA-150B it lands at f\/5.2; on the TSA-120 at f\/5.3; on the TSA-102 at f\/5.6 — each a substantial step down from the telescope's native focal ratio.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e4 elements in 3 groups:\u003c\/strong\u003e the same optical design used across every TOA-35 reducer kit, with two of the elements in low-dispersion, high-refractive-index glass.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e0.7x reduction:\u003c\/strong\u003e a 30% cut in focal length on each compatible telescope.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eΦ44mm corrected image circle:\u003c\/strong\u003e flat, sharp field across the reduced focal length — full coverage of APS-C and most 44mm-class sensors.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBundled CA Ring 150 (\"camera ring\"):\u003c\/strong\u003e sized for the TOA-150B and TSA-120\/TSA-102 mounts, installed as a matched system rather than sourced separately.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eOptical \/ Mechanical Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eTakahashi builds the TOA-35 as four elements in three groups, two of them in low-dispersion, high-refractive-index glass. It works as a focal reducer and a field corrector at the same time: the 30% reduction in focal length is what makes the telescope faster, and the correction is what keeps a Φ44mm circle flat once it is. Both matter for large-sensor imaging, where the corners are the first place a reducer's limits show.\u003c\/p\u003e\u003cp\u003eThe reducer threads to the included CA Ring 150. Back focus is 62.5mm on both the TOA-150B and the TSA-120. See the \u003ca href=\"\/pages\/takahashi-back-focus-guide\"\u003eTakahashi Back Focus Guide\u003c\/a\u003e for the full spacing chain.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eFaster deep-sky imaging on the TOA-150B, TSA-120 or TSA-102 where exposure time matters — nebulae, galaxies, and clusters that benefit from the reduced focal ratio; general astrophotography where a shorter focal length better frames larger targets.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eTelescope\u003c\/th\u003e\n\u003cth\u003eResulting focal length\u003c\/th\u003e\n\u003cth\u003eResulting focal ratio\u003c\/th\u003e\n\u003cth\u003eImage circle\u003c\/th\u003e\n\u003cth\u003eBack focus\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTOA-150B (this kit)\u003c\/td\u003e\n\u003ctd\u003e775mm\u003c\/td\u003e\n\u003ctd\u003ef\/5.2\u003c\/td\u003e\n\u003ctd\u003eΦ44mm\u003c\/td\u003e\n\u003ctd\u003e62.5mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTSA-120 (this kit)\u003c\/td\u003e\n\u003ctd\u003e635mm\u003c\/td\u003e\n\u003ctd\u003ef\/5.3\u003c\/td\u003e\n\u003ctd\u003eΦ44mm\u003c\/td\u003e\n\u003ctd\u003e62.5mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTSA-102 (this kit)\u003c\/td\u003e\n\u003ctd\u003e575mm\u003c\/td\u003e\n\u003ctd\u003ef\/5.6\u003c\/td\u003e\n\u003ctd\u003eΦ44mm\u003c\/td\u003e\n\u003ctd\u003eNot published for this pairing\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTOA-130NS \/ TOA-130NFB\u003c\/td\u003e\n\u003ctd\u003e698mm\u003c\/td\u003e\n\u003ctd\u003ef\/5.4\u003c\/td\u003e\n\u003ctd\u003eΦ44mm\u003c\/td\u003e\n\u003ctd\u003e65.5mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003cp\u003eThis is the same 0.7x reducer optic used on the TOA-130, but bundled here with the larger CA Ring 150 for the TOA-150 and TSA-120\/TSA-102 mounts. TOA-130NS\/NFB owners use the sibling kit, the \u003cstrong\u003eTOA-35 0.7x Reducer for TOA-130\u003c\/strong\u003e, which bundles the identical reducer with CA Ring 130 instead — the two kits are not interchangeable between telescopes even though the optic inside them is the same.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eSold as a matched kit:\u003c\/strong\u003e the CA Ring 150 (the \"camera ring\" in this listing's title) is bundled with the reducer, so there's nothing separate to source for a TOA-150B, TSA-120 or TSA-102.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eBack focus is the figure to confirm:\u003c\/strong\u003e the corners are where spacing shows, and the total depends on your camera, filter drawer and any spacers in between. Send us what you are connecting and we will add the chain up with you before you order.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eFrequently Asked Questions\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eIs it difficult to set up?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNo — the reducer threads to the included CA Ring 150, sized to install directly on the telescope's mount. The work is in getting the back focus total right, and that is a calculation we are happy to run for you.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is it best used for?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eDeep-sky astrophotography on the TOA-150B, TSA-120 or TSA-102 at a faster focal ratio than the telescope's native configuration.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this the same reducer as the TOA-130 kit?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eThe optic is identical. What differs is the bundled ring — this kit ships with CA Ring 150 for the TOA-150\/TSA-120\/TSA-102; the TOA-130 kit ships with CA Ring 130 instead.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill it cover my sensor?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eThe corrected circle is Φ44mm, which covers APS-C fully and most 44mm-class sensors. Larger full-frame corners fall outside it.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat else do I need with it?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eYour camera's own T-ring or adapter to complete the connection at the published back focus figure.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eA matched TOA-35 reducer kit for the TOA-150B and TSA-120\/TSA-102, with the CA Ring 150 camera ring included, delivering a flat Φ44mm image circle at f\/5.2–f\/5.6 depending on the telescope.\u003c\/p\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":54047113674863,"sku":"TAK-TKA32580NS","price":1495.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/TKA32580_1.jpg?v=1786914118"},{"product_id":"takahashi-fsq-106edx4-0-6x-f-3-reducer","title":"Takahashi FSQ-106EDX4 0.6x F\/3 Reducer","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe F\/3 0.6x Reducer takes the FSQ-106EDX4's native focal length down to 320mm at f\/3.0, one of the fastest focal ratios available for this astrograph. Four elements in three groups, fully multi-coated, deliver a Φ44mm image circle that Takahashi states covers a full 35mm sensor frame.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis reducer suits FSQ-106EDX4 owners chasing the fastest possible imaging speed — faint nebulosity, narrowband work under time pressure, or any target where cutting exposure time matters more than reach. At f\/3.0 it gathers considerably more light per unit time than the FSQ-106EDX4's native configuration.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e4 elements in 3 groups, multi-coated:\u003c\/strong\u003e built specifically to hold sharpness at an aggressive f\/3.0.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e0.6x reduction:\u003c\/strong\u003e takes the FSQ-106EDX4 to 320mm at f\/3.0.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eΦ44mm image circle:\u003c\/strong\u003e covers a full 35mm frame per Takahashi's published figures.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eM72x1.0 mounting interface:\u003c\/strong\u003e threads directly into the FSQ-106EDX4's camera train.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eOptical \/ Mechanical Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eBack focus is 56.2mm on the FSQ-106EDX4 with this reducer installed — the figure to build the rest of your imaging train around. See the \u003ca href=\"\/pages\/takahashi-back-focus-guide\"\u003eTakahashi Back Focus Guide\u003c\/a\u003e for the full spacing chain.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eFast narrowband and broadband imaging of faint nebulae and galaxies where exposure time is the limiting factor; wide-field deep-sky imaging where f\/3.0 shortens total integration time significantly versus a native-focal-ratio setup.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eTelescope\u003c\/th\u003e\n\u003cth\u003eResulting focal length\u003c\/th\u003e\n\u003cth\u003eResulting focal ratio\u003c\/th\u003e\n\u003cth\u003eImage circle\u003c\/th\u003e\n\u003cth\u003eBack focus\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFSQ-106EDX4\u003c\/td\u003e\n\u003ctd\u003e320mm\u003c\/td\u003e\n\u003ctd\u003ef\/3.0\u003c\/td\u003e\n\u003ctd\u003eΦ44mm\u003c\/td\u003e\n\u003ctd\u003e56.2mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003cp\u003eTakahashi also lists this reducer against the FSQ-130ED, where it produces a 390mm focal length.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eBuilt for the FSQ-106EDX4 primarily:\u003c\/strong\u003e Takahashi also markets it against the FSQ-130ED.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eFrequently Asked Questions\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eIs it difficult to set up?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNo — it threads directly onto the FSQ-106EDX4's M72x1.0 interface, and the 56.2mm back focus figure is fixed once it's installed.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is it best used for?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eFast deep-sky astrophotography on the FSQ-106EDX4, where f\/3.0 cuts exposure time significantly on faint targets.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes it work for visual observing?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNo — it's built to deliver a flat photographic image circle rather than a visual eyepiece path.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat else do I need with it?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eYour camera's own T-ring or adapter to complete the connection at the 56.2mm back focus figure.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eA fast 0.6x reducer that takes the FSQ-106EDX4 to 320mm at f\/3.0 across a full-frame-covering Φ44mm image circle, at a 56.2mm back focus.\u003c\/p\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":54047116361839,"sku":"TAK-TKA38581","price":2256.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/tka38581_2_6.jpg?v=1786914153"},{"product_id":"takahashi-cca-250-0-72x-645-reducer-ca","title":"Takahashi CCA-250 0.72x 645 Reducer-CA","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe 645 Reducer-CA 0.72x is Takahashi's dedicated focal reducer for the CCA-250 Cassegrain astrograph, cutting its focal length by 0.72x to reach 890mm at f\/3.6. The reducer delivers a Φ60mm image circle, sized for medium-format and large full-frame sensors.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis reducer suits CCA-250 owners who want a materially faster imaging system for deep-sky work with a larger-format camera. Increasing the speed of a Cassegrain design this way shortens integration time on faint targets without sacrificing the large-aperture light grasp the CCA-250 is built around.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e0.72x reduction:\u003c\/strong\u003e speeds up the CCA-250's optical system to f\/3.6 at 890mm.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eΦ60mm image circle:\u003c\/strong\u003e sized for larger imaging sensors, medium format included.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDedicated CCA-250 fit:\u003c\/strong\u003e engineered specifically for this telescope's Cassegrain optical path rather than adapted from a refractor reducer.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eOptical \/ Mechanical Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eBack focus with the reducer installed is 56.2mm on the CCA-250. See the \u003ca href=\"\/pages\/takahashi-back-focus-guide\"\u003eTakahashi Back Focus Guide\u003c\/a\u003e for the full spacing chain when planning your camera train.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eFast deep-sky imaging on the CCA-250 with medium-format or large full-frame cameras; galaxy and nebula imaging where a faster focal ratio meaningfully shortens total exposure time on a large-aperture Cassegrain.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eTelescope\u003c\/th\u003e\n\u003cth\u003eResulting focal length\u003c\/th\u003e\n\u003cth\u003eResulting focal ratio\u003c\/th\u003e\n\u003cth\u003eImage circle\u003c\/th\u003e\n\u003cth\u003eBack focus\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCCA-250\u003c\/td\u003e\n\u003ctd\u003e890mm\u003c\/td\u003e\n\u003ctd\u003ef\/3.6\u003c\/td\u003e\n\u003ctd\u003eΦ60mm\u003c\/td\u003e\n\u003ctd\u003e56.2mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003cp\u003eThis reducer is specific to the CCA-250 — the related 645RD QE 0.72x reducer serves the FSQ-106EDX4 instead, and the two aren't interchangeable between telescopes despite the similar naming and reduction factor.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eFrequently Asked Questions\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eIs it difficult to set up?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNo — it installs into the CCA-250's optical path as a dedicated fit, and the 56.2mm back focus figure is fixed once it's in place.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is it best used for?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eFast deep-sky astrophotography on the CCA-250 with medium-format or large full-frame sensors.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes it work for visual observing?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNo — it's built to deliver a flat photographic image circle rather than a visual eyepiece path.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat else do I need with it?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eYour camera's own adapter to complete the connection at the 56.2mm back focus figure.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eA dedicated 0.72x reducer for the CCA-250 that reaches 890mm at f\/3.6 across a Φ60mm image circle for medium-format astrophotography, at a 56.2mm back focus.\u003c\/p\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":54047117443183,"sku":"TAK-TKA86580L","price":2947.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/tka86580l_3.jpg?v=1786914180"},{"product_id":"takahashi-fsq-106edx4-0-72x-645rd-qe-reducer","title":"Takahashi FSQ-106EDX4 0.72x 645RD QE Reducer","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe 645RD QE 0.72x Reducer is Takahashi's medium-format focal reducer for the FSQ-106EDX4, cutting its focal length by 0.72x to reach 380mm at f\/3.6. Four large-diameter lenses deliver a Φ60mm image circle with Takahashi's published figures putting relative illumination above 70% at the periphery and above 90% across a full-frame sensor.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis reducer suits FSQ-106EDX4 owners shooting with medium-format or large full-frame cameras who want a faster focal ratio for wide, deep-sky fields — large nebula complexes, galaxy clusters, and Milky Way mosaics.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e4 lenses in 4 groups:\u003c\/strong\u003e large-diameter elements sized for a 60mm image circle.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e0.72x reduction:\u003c\/strong\u003e takes the FSQ-106EDX4 to 380mm at f\/3.6.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBroad-spectrum multilayer coatings:\u003c\/strong\u003e minimize reflections and ghosting while maximizing transmission across visible wavelengths.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eM72x0.75 male input thread:\u003c\/strong\u003e installs directly on the FSQ-106EDX4's camera train.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eOptical \/ Mechanical Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe reducer measures 74.2mm in total length and sets a back focus of 56.2mm, matching the metal back distance published for this configuration. See the \u003ca href=\"\/pages\/takahashi-back-focus-guide\"\u003eTakahashi Back Focus Guide\u003c\/a\u003e for the full spacing chain.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eWide-field deep-sky imaging on the FSQ-106EDX4 with medium-format or large full-frame sensors; nebula and galaxy field imaging where the full Φ60mm circle is put to use; general astrophotography where f\/3.6 shortens exposure times against the FSQ-106EDX4's native configuration.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eTelescope\u003c\/th\u003e\n\u003cth\u003eResulting focal length\u003c\/th\u003e\n\u003cth\u003eResulting focal ratio\u003c\/th\u003e\n\u003cth\u003eImage circle\u003c\/th\u003e\n\u003cth\u003eBack focus\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFSQ-106EDX4\u003c\/td\u003e\n\u003ctd\u003e380mm\u003c\/td\u003e\n\u003ctd\u003ef\/3.6\u003c\/td\u003e\n\u003ctd\u003eΦ60mm\u003c\/td\u003e\n\u003ctd\u003e56.2mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003cp\u003eThis reducer is specific to the FSQ-106EDX4 — the similarly-named 645 Reducer-CA 0.72x serves the CCA-250 instead, and the two aren't interchangeable between telescopes.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eAt 200g,\u003c\/strong\u003e it's a light addition to the imaging train, though it's worth accounting for once your camera and any filters are attached and the whole assembly is balanced on the focuser.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eFrequently Asked Questions\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eIs it difficult to set up?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNo — it threads directly onto the FSQ-106EDX4's M72x0.75 interface, and the 56.2mm back focus figure is fixed once it's installed.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is it best used for?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eWide-field deep-sky astrophotography on the FSQ-106EDX4 with medium-format and large full-frame sensors.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes it work for visual observing?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNo — it's built to deliver a flat photographic image circle rather than a visual eyepiece path.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat else do I need with it?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eYour camera's own adapter to complete the connection at the 56.2mm back focus figure.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eA medium-format 0.72x reducer that takes the FSQ-106EDX4 to 380mm at f\/3.6 across a Φ60mm image circle, at a 56.2mm back focus and a published weight of 200g.\u003c\/p\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":54047117508719,"sku":"TAK-TKA36580L","price":3229.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/tka36580l_2_6.jpg?v=1786914208"},{"product_id":"takahashi-fsq-130ed-0-7x-645-reducer","title":"Takahashi FSQ-130ED 0.7x 645 Reducer","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe 645 Reducer 0.7x is Takahashi's focal reducer for the FSQ-130ED, cutting the telescope's focal length by 0.7x to increase imaging speed for large-format sensors. It produces a Φ70mm image circle, the widest of any 645-series reducer in the Takahashi line, sized for large medium-format backs.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis reducer suits FSQ-130ED owners running large-format or medium-format cameras who want a faster system for wide, deep-sky fields without cropping the sensor's full coverage.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e0.7x reduction:\u003c\/strong\u003e increases the FSQ-130ED's imaging speed for large-format sensors.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eΦ70mm image circle:\u003c\/strong\u003e the widest corrected circle in Takahashi's 645 reducer lineup, suited to large medium-format chips.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eWide-field deep-sky imaging on the FSQ-130ED with large-format or medium-format cameras; nebula and galaxy field imaging where the wide Φ70mm circle is put to full use.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eTelescope\u003c\/th\u003e\n\u003cth\u003eReduction factor\u003c\/th\u003e\n\u003cth\u003eImage circle\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFSQ-130ED\u003c\/td\u003e\n\u003ctd\u003e0.7x\u003c\/td\u003e\n\u003ctd\u003eΦ70mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003cp\u003eThis reducer is specific to the FSQ-130ED and is a different part from the 645RD QE 0.72x (FSQ-106EDX4) and the 645 Reducer-CA 0.72x (CCA-250) — the three share a naming pattern but are not interchangeable between telescopes.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eFrequently Asked Questions\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eIs it difficult to set up?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eIt installs into the FSQ-130ED's imaging train as a dedicated reducer.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is it best used for?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eWide-field deep-sky astrophotography on the FSQ-130ED with large-format sensors.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes it work for visual observing?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNo — it's built to deliver a flat photographic image circle rather than a visual eyepiece path.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat else do I need with it?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eYour camera's own adapter to complete the connection — send us your setup and we'll confirm the spacing with you.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eA 0.7x reducer for the FSQ-130ED delivering a wide Φ70mm image circle for large-format astrophotography.\u003c\/p\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":54047117803631,"sku":"TAK-TKA38580","price":3356.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/tka38580_1_3.jpg?v=1786914236"},{"product_id":"takahashi-reducer-c-0-72x-for-the-fs-60cb","title":"Takahashi Reducer-C 0.72x for FS-60CB and FS-60Q","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe Reducer-C 0.72x is Takahashi's wide-field reducer for the FS-60 platform, dedicated to the FS-60CB, FS-60Q, and the earlier FS-60 models. On the FS-60CB it takes the native 355mm f\/5.9 down to roughly 255mm at f\/4.2, correcting a 40mm image circle at a fixed 56.2mm back focus. It weighs 180 g and adds 48 mm of length ahead of the sensor.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis is a good match if you own an FS-60CB or FS-60Q and want a faster, wider field for extended deep-sky exposures — nebula and Milky Way framing where the native focal length is already narrower than most refractors but you want it faster still.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e0.72x reduction:\u003c\/strong\u003e speeds up the FS-60CB from f\/5.9 to roughly f\/4.2 for wide-field imaging.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e40mm corrected image circle\u003c\/strong\u003e at a fixed 56.2mm back focus.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eM56 x 0.75 input, M52 x 0.75 output:\u003c\/strong\u003e a compact 48mm-long in-line unit weighing 180 g.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDirect camera mounting:\u003c\/strong\u003e supports direct DSLR attachment via a brand-specific T-ring, or CMOS\/CCD cameras with a filter wheel.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eOptical \/ Mechanical Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe FS-60 platform's native 355mm f\/5.9 (FS-60CB) is already a compact wide-field configuration; the Reducer-C 0.72x speeds it up further for shorter exposure times per unit of signal, at the cost of some focal length reach. Threaded between the drawtube's M56 x 0.75 female mount and an M52 x 0.75 camera-side output, the reducer holds a 40mm image circle and a fixed 56.2mm back focus, which is also published for the FS-60Q at its own native focal length.\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/TKA20580B_ReducerC_schema.png?v=1786913972\" alt=\"Dimensional diagram of the Takahashi Reducer-C 0.72x for FS-60CB\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eWide-field nebula and Milky Way imaging on the FS-60CB or FS-60Q, and extended-exposure deep-sky work where a faster focal ratio shortens total integration time.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eTakahashi dedicates this reducer to the FS-60 platform.\u003c\/p\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eTelescope\u003c\/th\u003e\n\u003cth\u003eNative\u003c\/th\u003e\n\u003cth\u003eWith Reducer-C 0.72x (calculated)\u003c\/th\u003e\n\u003cth\u003eImage circle\u003c\/th\u003e\n\u003cth\u003eBack focus\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFS-60CB\u003c\/td\u003e\n\u003ctd\u003e355mm f\/5.9\u003c\/td\u003e\n\u003ctd\u003e~256mm f\/4.2\u003c\/td\u003e\n\u003ctd\u003eΦ40mm\u003c\/td\u003e\n\u003ctd\u003e56.2mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFS-60Q\u003c\/td\u003e\n\u003ctd\u003e600mm f\/10.0\u003c\/td\u003e\n\u003ctd\u003e~432mm f\/7.2\u003c\/td\u003e\n\u003ctd\u003eΦ40mm\u003c\/td\u003e\n\u003ctd\u003e56.2mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003cp\u003eThe FS-60CB figures are Takahashi's own stated result (f\/5.9 to f\/4.2). The FS-60Q figure is calculated from that same published 0.72x factor applied to its native focal length. For thread and spacing detail across your full imaging train, see the \u003ca href=\"\/pages\/takahashi-back-focus-guide\"\u003eTakahashi Back Focus Guide\u003c\/a\u003e.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eA separate option from Takahashi's other FS-60CB reducer:\u003c\/strong\u003e Takahashi also publishes the RD NC0.85x for the same tube; the 0.72x here is the faster, wider-field alternative, not a replacement for it.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eBuilt for imaging, not eyepiece use:\u003c\/strong\u003e the flattened, reduced field has no benefit for visual observing.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eFrequently Asked Questions\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eIs it difficult to set up?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNo — it threads onto the FS-60's M56 x 0.75 drawtube thread and presents a fixed M52 x 0.75 output, so the 56.2mm back focus is set by the part itself.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is it best used for?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eWide-field, faster-ratio deep-sky imaging on the FS-60CB or FS-60Q.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I mount a DSLR directly?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eYes — a brand-specific T-ring threads to the M52 x 0.75 output, or a CMOS\/CCD camera can be mounted with a filter wheel in between.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes it also work on the FS-60Q?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eTakahashi states it is dedicated to the FS-60CB, FS-60Q, and earlier FS-60 models; send us your exact tube and we will confirm the fit before you order.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe Reducer-C 0.72x speeds the FS-60CB up to roughly f\/4.2 with a corrected 40mm image circle and a fixed 56.2mm back focus, at a compact 180 g.\u003c\/p\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":54047122063471,"sku":"TAK-TKA20580B","price":762.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/tka20580b_3.jpg?v=1786914460"},{"product_id":"takahashi-rd-qb-0-73x-new-reducer-for-baby-q","title":"Takahashi RD-QB 0.73x Reducer for FSQ-85EDX (\"Baby-Q\")","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe RD-QB 0.73x is the current-generation reducer for the FSQ-85EDX, Takahashi's BabyQ Petzval astrograph. Built with four elements in two groups using a newer, highly refractive low-dispersion ED glass, it brings the native 450mm f\/5.3 down to 330mm f\/3.9 while holding a 44mm image circle that covers full-frame sensors.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis is a good match if you own the FSQ-85EDX and want the widest, fastest field it can deliver — large nebula complexes, Milky Way fields, and wide star clusters on a full-frame sensor.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e0.73x reduction:\u003c\/strong\u003e 450mm f\/5.3 becomes 330mm f\/3.9 on the FSQ-85EDX.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e44mm image circle:\u003c\/strong\u003e covers full-frame digital sensors with the corrected field.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNew ED glass formula:\u003c\/strong\u003e four elements in two groups, an updated design over the earlier QE0.73x reducer with improved field curvature performance.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eM72 x 1 input, M56 x 0.75 output\u003c\/strong\u003e threads, with an internal 58mm filter thread, in a compact 78 x 63mm, 520 g housing.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eOptical \/ Mechanical Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe FSQ-85EDX's four-element Petzval design is already corrected for a wide native field; the RD-QB 0.73x uses the newer low-dispersion ED formula to speed that field up to f\/3.9 while holding the 44mm image circle needed for full-frame coverage. Takahashi positions it as the direct successor to the earlier QE0.73x reducer, with better field curvature control at the same reduction factor.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eWide-field, full-frame deep-sky imaging on the FSQ-85EDX — large nebula complexes, star clusters, and Milky Way fields where a fast, wide, flat field matters more than reach.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eTakahashi publishes this reducer for the FSQ-85EDX.\u003c\/p\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eTelescope\u003c\/th\u003e\n\u003cth\u003eNative\u003c\/th\u003e\n\u003cth\u003eWith RD QB0.73x\u003c\/th\u003e\n\u003cth\u003eImage circle\u003c\/th\u003e\n\u003cth\u003eBack focus\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFSQ-85EDX\u003c\/td\u003e\n\u003ctd\u003e450mm f\/5.3\u003c\/td\u003e\n\u003ctd\u003e330mm f\/3.9\u003c\/td\u003e\n\u003ctd\u003eΦ44mm\u003c\/td\u003e\n\u003ctd\u003e72.2mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003cp\u003eAn internal 58mm filter thread accepts common filter sizes without a separate holder. For spacing this reducer against your camera and filter wheel, see the \u003ca href=\"\/pages\/takahashi-back-focus-guide\"\u003eTakahashi Back Focus Guide\u003c\/a\u003e.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eSupersedes the earlier QE0.73x reducer:\u003c\/strong\u003e if you are matching this against an older FSQ-85EDX system chart that references the QE0.73x, the resulting focal length and ratio are the same but the internal glass and field curvature performance differ.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eBuilt for imaging, not eyepiece use:\u003c\/strong\u003e the reduced, flattened field has no benefit for visual observing.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eFrequently Asked Questions\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eIs it difficult to set up?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNo — it threads onto the FSQ-85EDX's M72 x 1 drawtube and presents an M56 x 0.75 output with a fixed 72.2mm back focus.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is it best used for?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eWide-field, full-frame deep-sky imaging on the FSQ-85EDX.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes it accept filters?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eYes — a 58mm internal filter thread is built into the unit.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this the same as the older QE0.73x reducer?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eIt reduces to the same 330mm f\/3.9, but uses a newer ED glass formula with better field curvature control — send us your current setup if you are upgrading and we will confirm compatibility.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe RD-QB 0.73x brings the FSQ-85EDX to a wide, fast 330mm f\/3.9 with a full-frame-covering 44mm image circle and a fixed 72.2mm back focus, at 520 g.\u003c\/p\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":54047127928943,"sku":"TAK-TKA37580","price":959.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/tka37580-1.jpg?v=1786914575"}],"url":"https:\/\/ontariotelescope.com\/collections\/fr-focal-reducers.oembed?page=2","provider":"Ontario Telescope and Accessories","version":"1.0","type":"link"}