{"product_id":"sharpstar-sca310-f-3-8","title":"Sharpstar SCA310 f\/3.8 Cassegrain","description":"\u003ch1\u003eSharpstar SCA310 Cassegrain\u003c\/h1\u003e\n\u003cp\u003e\u003cspan\u003eThe SCA310 is a 310mm large-aperture Cassegrain reflector. It features a fast f\/3.8 focal ratio, powerful light-gathering capability, and a wide imaging field, showing excellent performance for deep-sky astrophotography.à\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eWith a 310mm aperture and a fast f\/3.8 focal ratio, the SCA310 captures light with exceptional efficiency. This allows for significantly shorter exposure times and enhanced productivity in deep‑sky astrophotography, revealing fine details and vivid colors even in faint nebulae.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe SCA310 is a Cassegrain reflector whose primary mirror features a high-precision parabolic design. This aspheric mirror demands exceptional grinding and testing techniques to effectively eliminate spherical aberration, ensuring sharp, round star points.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eIts matching spherical secondary mirror is made from fused silica glass, offering outstanding thermal stability. Achieve long focal length optical path folding within a compact lens tube—delivering both high performance and excellent portability.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe primary and secondary mirrors are coated with enhanced aluminum, ensuring a reflectivity of over 95%, fully boosting the efficiency of light utilization.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/image_2026-01-03_113401120.png?v=1767458047\" alt=\"\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eA 3-inch, triplet coma corrector is integrated at the rear of the lens tube, including 1 piece of ED glass, which effectively corrects field curvature and coma to deliver sharp, round stars from the center to the edges of the frame.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe SCA310 is specially optimized for medium format and fully covers the full-frame sensors, providing nearly 100% illumination and a flat image field even when shooting with full-frame sensor cameras.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe SCA310’s optical structure has been carefully optimized. It does not require additional calculation of back focus when shooting， enabling quick and effortless focusing， which greatly simplifies the imaging process.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe lens tube uses a lightweight and robust carbon fiber material. This not only effectively reduces the overall weight but also possesses excellent structural stability and temperature adaptability, preventing focus shift caused by thermal expansion and contraction， ensuring consistent imaging performance.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/17f0dd53-88a8-4b35-9415-b4bc5f6efd19.jpg?v=1767458113\" alt=\"\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe top is equipped with a hollow handle for easy handling; the multi-hole slotted design facilitates the installation of various expansion accessories. The bottom is equipped with a 405mm long Losmandy-style dovetail plate, compatible with mainstream equatorial mounts. Constructed using full CNC processing, the thickened and widened design ensures stable and reliable installation.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/ab778383-2acf-4915-a43e-7cd7f6cf0036.jpg?v=1767458146\" alt=\"\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe 3.5-inch high-rigidity rack-and-pinion focuser has an upgraded focusing travel of 28mm, providing a greater focusing range. The dual-speed adjustment knob supports 1:10 fine focusing. The load capacity is further enhanced; even when loaded with multiple accessories, it maintains stable and smooth operation, eliminating slippage.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe focuser is equipped with a front-mounted 360° rotator, effectively preventing cable wrap during use. The rear features multiple threaded adapters (M68\/M54\/M48), ensuring seamless compatibility with a wide range of mainstream imaging equipment for precise and effortless focusing. The M48 adapter includes a built-in 2-inch filter thread, allowing for direct filter attachment during shooting.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/bdaa0548-eccb-4ccd-b71c-027dc4eca530.jpg?v=1767458177\" alt=\"\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe SCA310 also integrates three efficient cooling fans at the rear. This fan can be activated before observation to rapidly cool the primary mirror, accelerating thermal equilibrium and significantly enhancing both observing efficiency and the overall user experience.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eChoose the SCA310 to begin an efficient, stable, and deeply rewarding journey into deep-space exploration.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/122ea581-4dcc-4ea1-a77e-6f013a31210e.jpg?v=1767458204\" alt=\"\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003eTechnical Specifications\u003c\/span\u003e\u003c\/h3\u003e\n\u003ctable align=\"center\" cellspacing=\"0\" width=\"84.20%\" border=\"0\" style=\"width: 100%;\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 34.767%;\"\u003e\n\u003cp\u003e\u003cstrong\u003eAperture size\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd style=\"width: 65.233%;\"\u003e\n\u003cp\u003e\u003cstrong\u003e310mm\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 34.767%;\"\u003e\n\u003cp\u003e\u003cstrong\u003eFocal length\/Focal ratio\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd style=\"width: 65.233%;\"\u003e\n\u003cp\u003e\u003cstrong\u003e1178mm\/F3.8\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 34.767%;\"\u003e\n\u003cp\u003e\u003cstrong\u003ePrimary mirror type\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd style=\"width: 65.233%;\"\u003e\n\u003cp\u003e\u003cstrong\u003eAspherical primary mirror\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 34.767%;\"\u003e\n\u003cp\u003e\u003cstrong\u003ePrimary mirror material\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd style=\"width: 65.233%;\"\u003e\n\u003cp\u003e\u003cstrong\u003eSimilar to Pyrex glass\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 34.767%;\"\u003e\n\u003cp\u003e\u003cstrong\u003eSecondary mirror material\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd style=\"width: 65.233%;\"\u003e\n\u003cp\u003e\u003cstrong\u003eFused silica  glass\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 34.767%;\"\u003e\n\u003cp\u003e\u003cstrong\u003eImage circle\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd style=\"width: 65.233%;\"\u003e\n\u003cp\u003e\u003cstrong\u003eMedium format(55mm)\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 34.767%;\"\u003e\n\u003cp\u003e\u003cstrong\u003eTube material\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd style=\"width: 65.233%;\"\u003e\n\u003cp\u003e\u003cstrong\u003eCarbon fiber\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 34.767%;\"\u003e\n\u003cp\u003e\u003cstrong\u003eCorrector type\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd style=\"width: 65.233%;\"\u003e\n\u003cp\u003e\u003cstrong\u003eTriplet design (including one ED glass)\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 34.767%;\"\u003e\u003cstrong\u003eSecondary mirror diameter\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 65.233%;\"\u003e\u003cstrong\u003e184mm\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 34.767%;\"\u003e\u003cstrong\u003elens tube outer diameter\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 65.233%;\"\u003e\u003cstrong\u003e378mm\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 34.767%;\"\u003e\u003cstrong\u003elens tube total length\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 65.233%;\"\u003e\u003cstrong\u003e721mm\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 34.767%;\"\u003e\u003cstrong\u003eGross weight\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 65.233%;\"\u003e\u003cstrong\u003e23.5kg\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 34.767%;\"\u003e\u003cstrong\u003eResolution\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 65.233%;\"\u003e\u003cstrong\u003e0.37\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 34.767%;\"\u003e\n\u003cp\u003e\u003cstrong\u003eRear-end thread type\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd style=\"width: 65.233%;\"\u003e\n\u003cp\u003e\u003cstrong\u003eM48( (with M48×0.75 filter thread))\/M54\/M68 adapters\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 34.767%;\"\u003e\n\u003cp\u003e\u003cstrong\u003eRear-end connection distance\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd style=\"width: 65.233%;\"\u003e\n\u003cp\u003e\u003cstrong\u003eSupport 38-66mm range\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/b850342e-76c0-48b1-a19c-962d73520b4c.jpg?v=1767458268\" alt=\"\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/spec1.jpg?v=1767458339\" alt=\"\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/spec2.jpg?v=1767458376\" alt=\"\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/spec3.jpg?v=1767458376\" alt=\"\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/spec4.jpg?v=1767458377\" alt=\"\"\u003e\u003c\/p\u003e\n\u003ch3\u003eIn the Box\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli data-start=\"141\" data-end=\"185\"\u003e\n\u003cp data-start=\"143\" data-end=\"185\"\u003eSharpStar \u003cstrong data-start=\"153\" data-end=\"185\"\u003eSCA310 optical tube assembly\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"348\" data-end=\"383\"\u003e\n\u003cp data-start=\"350\" data-end=\"383\"\u003e\u003cstrong data-start=\"350\" data-end=\"383\"\u003eLosmandy-style dovetail plate\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"486\" data-end=\"510\"\u003e\n\u003cp data-start=\"488\" data-end=\"510\"\u003e\u003cstrong data-start=\"488\" data-end=\"510\"\u003eUser documentation\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003eWarranty\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/istronomyplus.com\/pages\/askar-sharpstar-warranty\" rel=\"noopener\" target=\"_blank\"\u003eSharpstar's Warranty\u003c\/a\u003e\u003c\/p\u003e","brand":"SharpStar","offers":[{"title":"Default Title","offer_id":48223211094245,"sku":"SS-SCA310","price":11200.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/1_884d63c1-0b41-4193-849a-d6cfd932cddf.webp?v=1767460920","url":"https:\/\/istronomyplus.com\/products\/sharpstar-sca310-f-3-8","provider":"Astronomy Plus – Telescopes \u0026 Astrophotography Canada","version":"1.0","type":"link"}