{"title":"Starizona Correctors","description":"\u003cp\u003eStarizona Correctors. Part of \u003ca href=\"\/collections\/flatteners-and-reducers\"\u003eFlatteners, Reducers \u0026amp; Correctors\u003c\/a\u003e.\u003c\/p\u003e","products":[{"product_id":"starizona-nexus-0-75x-newtonian-focal-reducer-coma-corrector","title":"Starizona Nexus 0.75x Newtonian Focal Reducer\/Coma Corrector","description":"\u003cspan style=\"color: rgb(77, 77, 77); font-family: Lato, sans-serif; font-size: 15px; background-color: rgb(255, 255, 255);\"\u003eNewtonian telescopes require a coma corrector in order to give sharp stars over a large field of view, but most coma correctors keep the telescope's native focal ratio or even make the scope slower. The Nexus instead acts as a coma corrector and also provides a 0.75x focal reduction factor. This turns a common f\/4 Newtonian into an f\/3 system, giving a larger field of view and reducing exposure times by a factor of 1.8x.\u003c\/span\u003e\u003cbr style=\"box-sizing: inherit; -webkit-font-smoothing: antialiased; text-size-adjust: none; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); color: rgb(77, 77, 77); font-family: Lato, sans-serif; font-size: 15px; background-color: rgb(255, 255, 255);\"\u003e\u003cbr style=\"box-sizing: inherit; -webkit-font-smoothing: antialiased; text-size-adjust: none; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); color: rgb(77, 77, 77); font-family: Lato, sans-serif; font-size: 15px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"color: rgb(77, 77, 77); font-family: Lato, sans-serif; font-size: 15px; background-color: rgb(255, 255, 255);\"\u003eThe Nexus incorporates extra-low dispersion (ED) glass in a sophisticated optical design that gives performance equal to the best coma correctors while decreasing, instead of increasing, the focal length. The Nexus is also designed to be parfocal, so it does not change the original focal point of the telescope. The corrected image circle is 28mm, accommodating camera sensors up to APS format. While nominally designed for the popular commercial f\/4 imaging Newtonians, the Nexus can work with Newtonians as fast at f\/3.\u003c\/span\u003e\u003cbr style=\"box-sizing: inherit; -webkit-font-smoothing: antialiased; text-size-adjust: none; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); color: rgb(77, 77, 77); font-family: Lato, sans-serif; font-size: 15px; background-color: rgb(255, 255, 255);\"\u003e\u003cbr style=\"box-sizing: inherit; -webkit-font-smoothing: antialiased; text-size-adjust: none; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); color: rgb(77, 77, 77); font-family: Lato, sans-serif; font-size: 15px; background-color: rgb(255, 255, 255);\"\u003e\u003cspan style=\"color: rgb(77, 77, 77); font-family: Lato, sans-serif; font-size: 15px; background-color: rgb(255, 255, 255);\"\u003eBackfocus requirement for the Nexus is 55mm, matching the common standard for most coma correctors, field flatteners and focal reducers. This distance allows for the use of DSLRs as well as mirrorless cameras and most astronomical CMOS and CCD cameras. The Nexus has M48 threads on the camera side. The barrel of the Nexus is a standard 2\" diameter to fit most focusers. On the telescope end are M48 threads for a standard 2\" filter.\u003c\/span\u003e","brand":"Starizona","offers":[{"title":"Default Title","offer_id":44013888700527,"sku":"NEXUS-075","price":639.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/NexusFrontView_826x1200_9fd9e8b6-b767-428f-b1a8-6f392825698d_1200x1200__63403.jpg?v=1766565601"},{"product_id":"starizona-sct-corrector-iv-0-63x-reducer-coma-corrector","title":"Starizona SCT Corrector IV - 0.63X Reducer \/ Coma Corrector","description":"\u003cp\u003e\u003cstrong\u003ePerformance\u003c\/strong\u003e\u003c\/p\u003e\n\u003cdiv\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/C11_f6pt3_Spot_Comparison_c86b4ee8-75ce-4333-9fb9-b0a4bb895169.jpg?v=1766566089\" alt=\"\"\u003e\u003c\/div\u003e\n\u003cp\u003eThe diagram above shows how the SCT Corrector improves the off-axis spot size on a Celestron 11\" SCT. Performance is similar on other size telescopes.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFocal Length\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe exact focal length of the reducer\/telescope combo depends slightly on where in the optical path the SCT Corrector lens is placed. Nominally it will be within a few mm of the rear threads on the telescope. Changing this distance should only affect the focal length, not the optical quality. Listed below are the nominal focal lengths for the various sizes of Celestron SCTs*. The SCT Corrector works great on standard f\/10 Meade SCTs as well, we just didn't have exact data for the nominal designs of those telescopes.\u003c\/p\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd width=\"100\"\u003e\u003cstrong\u003eTelescope\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd width=\"100\"\u003e\u003cstrong\u003eFocal Length\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd width=\"100\"\u003e\u003cstrong\u003eFocal Ratio\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eC6\u003c\/td\u003e\n\u003ctd\u003e1220mm\u003c\/td\u003e\n\u003ctd\u003ef\/8\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eC8\u003c\/td\u003e\n\u003ctd\u003e1450mm\u003c\/td\u003e\n\u003ctd\u003ef\/7.1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eC9.25\u003c\/td\u003e\n\u003ctd\u003e1525mm\u003c\/td\u003e\n\u003ctd\u003ef\/6.5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eC11\u003c\/td\u003e\n\u003ctd\u003e1760mm\u003c\/td\u003e\n\u003ctd\u003ef\/6.3\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eC14\u003c\/td\u003e\n\u003ctd\u003e2365mm\u003c\/td\u003e\n\u003ctd\u003ef\/6.7\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e\u003cem\u003e* The SCT Corrector has a reduction factor of 0.63x, but the C6 and C8 are actually closer to f\/11 natively, and they have a shorter backfocus compared to the larger scopes so the reduction is a bit less.  The C14 is f\/11 natively.\u003cbr\u003e\u003c\/em\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCamera Adapters\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe SCT Corrector IV has a nominal image circle of 27mm, accommodating most popular CCDs and DSLRs. For larger format cameras, check out our\u003cspan\u003e \u003c\/span\u003e\u003ca href=\"https:\/\/starizona.com\/products\/starizona-sct-corrector-lf-large-format-reducer-coma-corrector\"\u003eSCT Corrector LF.\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003eBecause the backfocus of the SCT Corrector IV is fairly critical, for best performance Starizona makes a variety of camera adapters, and custom adapters are also easy to make for less-common camera setups.\u003c\/p\u003e\n\u003cp\u003eThe nominal backfocus is 90.3mm from the base of the threads on the camera side of the SCT Corrector IV. For the largest compatible cameras, this should be kept within +\/-2mm, while smaller format cameras may work fine at slightly larger tolerances. If we do not have the correct length or style adapter you need, we can gladly make the correct part to get the best performance from your setup. Please contact with any questions on making your camera configuration work.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTelescope Adapters\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe SCT Corrector IV, like the original SCT Corrector, has a 2\" barrel that allows it to fit into a 2\" visual back or 2\" focuser. If your telescope does not have such an adapter, we recommend our\u003cspan\u003e Virtual View\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003erotating visual back, which allows for easily changing the camera orientation without loosening any lock screws.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFilters\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe front (telescope side) of the SCT Corrector IV is threaded to accept standard 2\" (48mm) filters.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFeatures\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e0.63x focal reduction factor\u003c\/li\u003e\n\u003cli\u003e2.5x faster than SCT's native f\/10\u003c\/li\u003e\n\u003cli\u003e1.4x faster than original f\/7.5 SCT Corrector design\u003c\/li\u003e\n\u003cli\u003e27mm image circle\u003c\/li\u003e\n\u003cli\u003e2\" barrel diameter\u003c\/li\u003e\n\u003cli\u003e2.5\" length excluding threads\u003c\/li\u003e\n\u003cli\u003eThreaded for 48mm filters\u003c\/li\u003e\n\u003cli\u003eSCT Corrector Top Thread: M42 x 0.75mm T-thread\u003c\/li\u003e\n\u003cli\u003eMechanical Backfocus (thread shelf to focal plane): 90.3mm (3.56”)\u003c\/li\u003e\n\u003cli\u003eBlack anodized, machined aluminum housing\u003c\/li\u003e\n\u003cli\u003eFully multi-coated optics\u003c\/li\u003e\n\u003cli\u003e5-element optical design with extra-low dispersion (ED) glass\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Starizona","offers":[{"title":"Default Title","offer_id":44013906788463,"sku":"SCTCORR-4","price":564.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/sct-1_650x650__17442.jpg?v=1766566091"},{"product_id":"apex-ed-s-0-65x-reducer-flattener","title":"Apex ED 0.65x Reducer \/ Flattener - Short","description":"\u003cp\u003eWith the Apex ED reducer, an f\/5.5 apo refractor becomes an incredibly fast f\/3.6 astrograph. A slower f\/9 telescope like an RC becomes a speedy f\/5.9 system. The reduction factor provides a 1.5x wider field of view and shortens exposure times by a factor of 2.4x!\u003c\/p\u003e\n\u003cp\u003eThe Apex ED reducer features extra-low disperion glass to eliminate chromatic aberration and to provide sharp star images over a 30mm image circle, capable of working with most popular CCD, CMOS and DSLR cameras up to APS-C format.\u003c\/p\u003e\n\u003cp\u003eThe Apex ED reducer fits into a standard 2\" focuser. It has M42 T-threads on the camera side, and it can accept a standard 2\" (M48) filter on the telescope side for easy use of light-pollution or other filters. On Meade ACF telescopes, the Apex can be attached using a 2\" visual back.\u003c\/p\u003e\n\u003cp\u003eFor select refractors, we make\u003cspan\u003e optional threaded adapters\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003eto allow direct threaded attachment of the Apex reducer, eliminating the possibility of tilt introduced by the standard focuser clamp ring.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\"L\" and \"S\" Versions\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eTo optimize the Apex ED for the best possible performance, there are two versions of the lens. The \"L\" version is designed for telescopes with focal lengths 500mm and longer. This includes most larger (100mm+) refractors and all RC and ACF telescopes. The \"S\" version is for telescopes with focal lengths from 300-500mm, including most 60-80mm apo refractors.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eBackfocus\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe nominal backfocus distance from the Apex ED reducer's T-threads to the image sensor depends slightly on the focal length of the telescope. It is at least 55mm in all configurations. The table below shows the optimum backfocus for various focal lengths. Please contact us for help in choosing the right adapters or spacers necessary for your setup.\u003c\/p\u003e\n\u003cdiv\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/Apex-Chart_71daf9d2-16b6-4c77-9025-1666de0faac1.png?v=1766566099\" alt=\"Apex Backfocus Chart\"\u003e\u003c\/div\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cdiv\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/threaded-adapter-set-up_072ffe11-4b39-4d08-a552-51d7b1eac34a.jpg?v=1766566100\"\u003e\u003c\/div\u003e\n\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eReduction Factor\u003c\/strong\u003e: 0.65x\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eImage Circle\u003c\/strong\u003e: 30mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBackfocus\u003c\/strong\u003e: 55-62mm (depending on telescope focal length)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOptical Design\u003c\/strong\u003e: 5 elements with ED glass, fully multi-coated\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBarrel Diameter\u003c\/strong\u003e: 2\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCamera Thread\u003c\/strong\u003e: M42 (T-thread)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFilter Thread\u003c\/strong\u003e: M48 (2\" filter)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverall Length (Apex ED L)\u003c\/strong\u003e: 2.97\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight (Apex ED L)\u003c\/strong\u003e: 0.7 lbs\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverall Length (Apex ED S)\u003c\/strong\u003e: 3.26\";\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight (Apex ED S)\u003c\/strong\u003e: 0.72 lbs\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Starizona","offers":[{"title":"Default Title","offer_id":44013907476591,"sku":"APEXED-S","price":649.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/apex-1_650x650__62967.jpg?v=1766566103"},{"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":"starizona-sct-corrector-lf-large-format-reducer-coma-corrector","title":"Starizona SCT Corrector LF - Large Format Reducer\/Coma Corrector","description":"\u003cp\u003e\u003cspan\u003eStarizona's SCT Corrector has been an incredibly popular focal reducer and coma corrector, giving astrophotographers with standard Schmidt-Cassegrain telescopes an improved optical system and wider field of view, with increased photographic speed. Starizona now offers a large-format version, the SCT Corrector LF, designed to cover full-frame (35mm format) sensors.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003eThe SCT Corrector LF is designed for Celestron 11\" and 14\" standard SCTs. Designed to thread directly onto the large 3.29\" threads on the rear cell of C11 and C14 telescopes, the larger optical elements of the SCT Corrector LF minimize the vignetting over large sensors. Remaining vignetting over a large field is minimal and limited only by the telescope baffles, which are designed for a slower focal ratio; but this vignetting is easily removed by using flat field images. Sharpness is excellent over a 42mm diagonal, with spots sizes up to 9x smaller than the native telescope! The focal ratio is reduced to f\/7.2 on the C14 and f\/7 on the C11, for a speed increase of 2.1x and 1.9x, respectively.\u003c\/p\u003e\n\u003cp\u003eThe SCT Corrector LF is designed to increase the available backfocus compared to Starizona's standard SCT Corrector. Backfocus is 146, accommodating a variety of accessories. The rear threads on the SCT Corrector LF are the same 3.29\" threads as on the rear cell of the C11 and C14 telescopes, so standard accessories are easily attached.\u003c\/p\u003e\n\u003cdiv\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/SCT_LF_Spots_6d8891ac-8d5b-4f35-a0b5-e5b3b672cf58.jpg?v=1766566119\" alt=\"\"\u003e\u003c\/div\u003e\n\u003cp\u003e\u003cstrong\u003eAbove:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e\u003cem\u003eSpots sizes compared for a native C14 at f\/11 versus a C14 at f\/7.5 with the SCT Corrector LF. Each small square in the diagram is 40 microns. The RMS spot size at the edge of the field for the native C14 is 106 microns and the SCT Corrector LF is just 13 microns!\u003c\/em\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eC11 Specifications\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFocal Ratio:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003ef\/7\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFocal Length:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e1960mm\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eC14 Specifications\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFocal Ratio:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003ef\/7.2\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFocal Length:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e2560mm\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eGeneral Specifications\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eImage Circle:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e42mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMechanical Backfocus:\u003c\/strong\u003e 146mm from top of mounting threads\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaximum Diameter:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e3.5\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverall Length:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e2.7\" (length added from normal mounting threads is 2.3\")\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMounting Thread:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eStandard C11\/14 3.29\"-16tpi thread\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e1.6 lbs (730g)\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eFully AR coated optics\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eMade in USA\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Starizona","offers":[{"title":"Default Title","offer_id":44013907738735,"sku":"SCTCORR-LF","price":709.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/sct-lf2_1_650x650__01433.jpg?v=1766566121"},{"product_id":"apex-ed-0-65x-reducer-flattener-long","title":"Apex ED 0.65x Reducer \/ Flattener Long","description":"\u003cp\u003eWith the Apex ED reducer, an f\/5.5 apo refractor becomes an incredibly fast f\/3.6 astrograph. A slower f\/9 telescope like an RC becomes a speedy f\/5.9 system. The reduction factor provides a 1.5x wider field of view and shortens exposure times by a factor of 2.4x!\u003c\/p\u003e\n\u003cp\u003eThe Apex ED reducer features extra-low disperion glass to eliminate chromatic aberration and to provide sharp star images over a 30mm image circle, capable of working with most popular CCD, CMOS and DSLR cameras up to APS-C format.\u003c\/p\u003e\n\u003cp\u003eThe Apex ED reducer fits into a standard 2\" focuser. It has M42 T-threads on the camera side, and it can accept a standard 2\" (M48) filter on the telescope side for easy use of light-pollution or other filters. On Meade ACF telescopes, the Apex can be attached using a 2\" visual back.\u003c\/p\u003e\n\u003cp\u003eFor select refractors, we make\u003cspan\u003e optional threaded adapters\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003eto allow direct threaded attachment of the Apex reducer, eliminating the possibility of tilt introduced by the standard focuser clamp ring.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\"L\" and \"S\" Versions\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eTo optimize the Apex ED for the best possible performance, there are two versions of the lens. The \"L\" version is designed for telescopes with focal lengths 500mm and longer. This includes most larger (100mm+) refractors and all RC and ACF telescopes. The \"S\" version is for telescopes with focal lengths from 300-500mm, including most 60-80mm apo refractors.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eBackfocus\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe nominal backfocus distance from the Apex ED reducer's T-threads to the image sensor depends slightly on the focal length of the telescope. It is at least 55mm in all configurations. The table below shows the optimum backfocus for various focal lengths. Please contact us for help in choosing the right adapters or spacers necessary for your setup.\u003c\/p\u003e\n\u003cdiv\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/Apex-Chart_51002c38-5d32-4c33-85c4-519d049754ac.png?v=1766568599\" alt=\"Apex Backfocus Chart\"\u003e\u003c\/div\u003e","brand":"Starizona","offers":[{"title":"Default Title","offer_id":44014041170031,"sku":"APEXED-L","price":649.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/apex-1_650x650__62967__23491.jpg?v=1766568601"}],"url":"https:\/\/ontariotelescope.com\/collections\/fr-starizona.oembed","provider":"Ontario Telescope and Accessories","version":"1.0","type":"link"}