{"title":"Lunettes ED SVBONY SV503","description":"\u003cp\u003eLes lunettes SVBONY SV503 utilisent du verre ED pour limiter le chromatisme, pour des vues nettes et une première approche de l'astrophotographie. Les 80mm f\/7 et 102mm f\/7 sont des doublets ED adaptés à l'observation de la Lune, des planètes et des étoiles doubles, et à l'imagerie avec un aplanisseur de champ. La 70mm f\/6.78 est un quadruplet à champ plat qui offre un champ plat au capteur sans optique supplémentaire.\u003c\/p\u003e\u003cp\u003eToutes sont vendues en tube optique seul.\u003c\/p\u003e","products":[{"product_id":"svbony-sv503-ed-80mm-f7-doublet","title":"SVBONY SV503 ED 80mm F7 Doublet","description":"\u003c!-- more --\u003e\n\u003cp\u003e1.Rugged housing prevents damage;\u003c\/p\u003e\n\u003cp\u003e2.Sliding graceful and soft dual-speed focuser;\u003c\/p\u003e\n\u003cp\u003e3.Ed glass (S-FPL51) can produce very beautiful and clear images;\u003c\/p\u003e\n\u003cp\u003e4.The fully multilayer coated lens eliminates all reflections on the glass, and it has little or no chromatic aberration at high magnification.\u003c\/p\u003e\n\u003ctable cellspacing=\"0\" cellpadding=\"0\" border=\"0\"\u003e\n\u003ccolgroup\u003e\n\u003ccol\u003e\n\u003ccol\u003e\n\u003c\/colgroup\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eSVBONY\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel\u003c\/td\u003e\n\u003ctd\u003eSV503\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eObjective Lens Diameter \u003c\/td\u003e\n\u003ctd\u003e80mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEye Piece Lens Description\u003c\/td\u003e\n\u003ctd\u003eED\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length\u003c\/td\u003e\n\u003ctd\u003e560 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Ratio\u003c\/td\u003e\n\u003ctd\u003eF7\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLens Coated\u003c\/td\u003e\n\u003ctd\u003eUltra-wideband Coating\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eObjective Lens Type\u003c\/td\u003e\n\u003ctd\u003eDouble Separation Lens Structure\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLimit Magnitude\u003c\/td\u003e\n\u003ctd\u003e11.6\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSet The Light Force\u003c\/td\u003e\n\u003ctd\u003e130.6x\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eResolution\u003c\/td\u003e\n\u003ctd\u003e1.5 Arcseconds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e3950g\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTelescope Tube Material\u003c\/td\u003e\n\u003ctd\u003eAluminum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTube Outer Diameter\u003c\/td\u003e\n\u003ctd\u003e103mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocuser\u003c\/td\u003e\n\u003ctd\u003e2 inch Dual Speed Focuser; The Gear Ratio 110\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocuser Type\u003c\/td\u003e\n\u003ctd\u003eRack Pinion Design\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePackages\u003c\/td\u003e\n\u003ctd\u003e1x SV503 White 80ED F7 Telescope OTA (for observing and for astrophotography)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Dimensions\u003c\/td\u003e\n\u003ctd\u003e540mm*215mm*230mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e","brand":"SVBONY","offers":[{"title":"Default Title","offer_id":49024062980381,"sku":"SV-F9359B","price":580.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/image_06400c35-1e84-4d73-aa31-c62bfdd3378b.jpg?v=1723303339"},{"product_id":"svbony-sv503-102mm-f-7-ed-doublet-refractor-telescope-ota","title":"SVBONY SV503 102mm f\/7 ED Doublet Refractor Telescope OTA","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e102mm Aperture ED Doublet Refractor\u003c\/li\u003e\n\u003cli\u003e714mm Focal Length (f\/7)\u003c\/li\u003e\n\u003cli\u003eS-FPL51 Extra-Low Dispersion Glass\u003c\/li\u003e\n\u003cli\u003e1:10 Dual-Speed Rack \u0026amp; Pinion Focuser\u003c\/li\u003e\n\u003cli\u003e101.9mm of Back Focus\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eSVBONY SV503 102mm f\/7 ED Doublet Refractor OTA\u003c\/h2\u003e\n\u003cp\u003eThe SVBONY SV503 102mm f\/7 ED Doublet Refractor combines a 102mm aperture with S-FPL51 extra-low dispersion glass to deliver high-contrast images with minimal chromatic aberration. Its 714mm focal length provides a versatile f\/7 focal ratio suitable for a wide range of celestial targets, while the optical system achieves a theoretical resolving capacity of 1.17 arc-seconds. With a light gathering capacity 212 times that of the human eye, this telescope makes faint deep-sky objects accessible for both imaging and visual observation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eS-FPL51 ED Optics: A 102mm f\/7 Doublet for High-Contrast Imaging\u003c\/h3\u003e\n\u003cp\u003eAt the heart of the SV503 is an air-spaced doublet objective featuring S-FPL51 ED glass, which significantly reduces false color (chromatic aberration) common in standard achromats. This correction results in sharp, high-contrast views of bright objects like Jupiter and the lunar terminator, with Super Multi-Coating (SMC) ensuring maximum light transmission. The 102mm aperture and moderate f\/7 focal ratio create a capable deep-sky instrument, resolving stars down to magnitude 12.1 under dark skies.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003e1:10 Dual-Speed Focuser: 101.9mm of Back Focus for Imaging Trains\u003c\/h3\u003e\n\u003cp\u003eThe SV503 is equipped with a robust Rack and Pinion (RAP) focuser, which eliminates the slippage and flexure associated with Crayford designs when supporting heavy imaging equipment. A 1:10 fine-focus knob allows for the critical adjustments needed to achieve sharp stars in astrophotography. With a generous 101.9mm of back focus, you have ample room to accommodate a full imaging train, including filter wheels, off-axis guiders, and dedicated astronomy cameras.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eImaging-Ready Build: A 5.7kg OTA with a 200mm Dovetail\u003c\/h3\u003e\n\u003cp\u003eConstructed from aluminum, the optical tube assembly measures 630mm in length and weighs 5.7kg with the included rings and dovetail, making it a stable and manageable payload for mid-range equatorial mounts. The package includes a 200mm long Vixen-style dovetail bar, providing a secure connection to your mount and allowing for easy balancing adjustments. This combination of moderate weight and rigid construction ensures the stability required for long-exposure astrophotography.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eSVBONY SV503 102mm vs. 80mm: Aperture and Light Gathering\u003c\/h3\u003e\n\u003cp\u003eWhile both the 102mm and 80mm SV503 models share the same f\/7 focal ratio and S-FPL51 glass, the choice between them comes down to aperture and portability. The SV503 102mm offers a clear advantage in light-gathering power and resolution, making it the superior choice for imaging smaller galaxies, resolving globular clusters, and capturing fine planetary detail.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSV503 102mm:\u003c\/strong\u003e Its larger aperture gathers 64% more light than the 80mm version, providing brighter images and revealing fainter details. This makes it better suited for targets where resolution is key.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSV503 80mm:\u003c\/strong\u003e The 80mm is significantly lighter and more compact, making it an ideal portable or \"grab-and-go\" telescope. Its shorter focal length (560mm) also provides a wider true field of view, which is advantageous for framing large emission nebulae like the North America Nebula (NGC 7000).\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat kind of mount is required for the SVBONY SV503 102mm?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWith a tube weight of \u003cstrong\u003e5.7kg\u003c\/strong\u003e, the SV503 102mm OTA requires a sturdy equatorial mount for astrophotography. A mount with a payload capacity of at least 20-25 lbs (9-11 kg) is recommended to ensure stability for long exposures. Examples include mounts in the Celestron AVX or Sky-Watcher HEQ5 class.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow will the SVBONY SV503 102mm perform on the Andromeda Galaxy (M31)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe \u003cstrong\u003e102mm aperture\u003c\/strong\u003e and \u003cstrong\u003e714mm focal length\u003c\/strong\u003e are well-suited for framing large targets like the Andromeda Galaxy (M31). You will be able to capture the bright galactic core and its surrounding dust lanes. For a full field of view that includes its satellite galaxies M32 and M110, you may need to use a dedicated focal reducer.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the S-FPL51 glass in the SV503 102mm good enough for astrophotography?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. \u003cstrong\u003eS-FPL51\u003c\/strong\u003e is an extra-low dispersion glass that provides excellent color correction, especially for a doublet design. While a more expensive triplet apochromat will offer a higher degree of correction, the SV503 102mm delivers sharp, high-contrast images with minimal purple fringing on bright stars, making it a very capable and affordable entry into serious astrophotography.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the advantage of the 101.9mm back focus on the SV503 102mm?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe \u003cstrong\u003e101.9mm of back focus\u003c\/strong\u003e is the distance from the focuser's flange to the focal plane. This generous distance is crucial for astrophotography as it provides enough space to install accessories like filter wheels, off-axis guiders, and astronomy cameras while still being able to reach focus.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the SVBONY SV503 102mm for visual observing?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAbsolutely. While optimized for imaging, the SV503 102mm is an excellent visual instrument. Its \u003cstrong\u003e102mm ED objective\u003c\/strong\u003e provides crisp, high-contrast views of the Moon, planets, and bright deep-sky objects. The \u003cstrong\u003e1:10 dual-speed focuser\u003c\/strong\u003e makes it easy to snap objects into perfect focus visually.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill I see chromatic aberration with the SVBONY SV503 102mm ED doublet?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe \u003cstrong\u003eS-FPL51 ED glass\u003c\/strong\u003e significantly suppresses chromatic aberration (false color). On extremely bright targets like Sirius or Vega at high magnification, a trace amount of residual color may be visible, which is typical for a doublet design. However, for the vast majority of astronomical targets, the color correction is excellent and will not detract from the view.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Name\u003c\/td\u003e\n\u003ctd\u003eSVBONY SV503 102F7 ED Astronomy Telescope\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003eRefractor\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAperture\u003c\/td\u003e\n\u003ctd\u003e102mm \/ 4.01-Inch\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length\u003c\/td\u003e\n\u003ctd\u003e714mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Ratio\u003c\/td\u003e\n\u003ctd\u003ef\/7\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eObjective Lens\u003c\/td\u003e\n\u003ctd\u003eS-FPL51 ED Doublet\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Coating\u003c\/td\u003e\n\u003ctd\u003eSMC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocuser\u003c\/td\u003e\n\u003ctd\u003eRack and Pinion (RAP)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGear Reduction\u003c\/td\u003e\n\u003ctd\u003e1:10 Dual-Speed\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBack Focus\u003c\/td\u003e\n\u003ctd\u003e101.9mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eResolution\u003c\/td\u003e\n\u003ctd\u003e1.17\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLimiting Magnitude\u003c\/td\u003e\n\u003ctd\u003e12.1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLight Gathering Power\u003c\/td\u003e\n\u003ctd\u003e212x\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax Useful Magnification\u003c\/td\u003e\n\u003ctd\u003e204x\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTube Material\u003c\/td\u003e\n\u003ctd\u003eAluminum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOTA Weight (with rings)\u003c\/td\u003e\n\u003ctd\u003e5.7kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOTA Length\u003c\/td\u003e\n\u003ctd\u003e630mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTube Outer Diameter\u003c\/td\u003e\n\u003ctd\u003e121mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMounting Hardware\u003c\/td\u003e\n\u003ctd\u003eDovetail \u0026amp; Rings Included\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDovetail Length\u003c\/td\u003e\n\u003ctd\u003e200mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Dimensions\u003c\/td\u003e\n\u003ctd\u003e690mm x 210mm x 250mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/SVBONY_SV503_Manual.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Manual\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eSV503 102mm f\/7 ED Refractor OTA\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eTube Rings\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1 Pair\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e200mm Vixen-Style Dovetail Bar\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eLens Cover\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e1.25\" Dust Cap\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/SVBONY_SV503_Manual.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Manual\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/svbony-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eSVBONY 1-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SVBONY","offers":[{"title":"Default Title","offer_id":52861224911133,"sku":"SV-F9359D","price":735.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/SVBONY-ED-Doublet-Refractor-Telescope-for-Astrophotography-SV503-102-1_4eabcc19-7193-438f-9fa5-298e4da81a5c.jpg?v=1788659463"},{"product_id":"svbony-sv503-70mm-f-6-78-quadruplet-ed-flatfield-refractor-telescope-ota","title":"SVBONY SV503 70mm f\/6.78 Quadruplet ED Flatfield Refractor Telescope OTA","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e70mm Aperture Quadruplet Astrograph\u003c\/li\u003e\n\u003cli\u003e474mm Focal Length (f\/6.78)\u003c\/li\u003e\n\u003cli\u003e32mm Corrected Flat-Field Image Circle\u003c\/li\u003e\n\u003cli\u003e2.5\" Rack-and-Pinion Focuser\u003c\/li\u003e\n\u003cli\u003e127.5mm Working Distance\u003c\/li\u003e\n\u003cli\u003eFPL51 and Lanthanum ED Glass Elements\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eSVBONY SV503 70mm f\/6.78 ED Flatfield Refractor\u003c\/h2\u003e\n\u003cp\u003eThe SVBONY SV503 70 refractor is a purpose-built astrograph, combining a 70mm aperture and 474mm focal length into a compact f\/6.78 optical system. Its 4-element design, featuring FPL51 and lanthanum glass, delivers a fully corrected 32mm flat-field image circle, eliminating the need for a separate flattener. Weighing just 5.9 lbs, this telescope provides a generous 127.5mm of working distance from its 2.5\" focuser for complex imaging trains.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eQuadruplet Optics: A 32mm Flat-Field Imaging Circle\u003c\/h3\u003e\n\u003cp\u003eThe SV503 70 integrates a 2-element objective with a 2-element corrector, creating a 4-element \"quadruplet\" design that corrects for field curvature internally. This system produces a 32mm diameter image circle with 100% correction, ensuring pinpoint stars across the frame of popular APS-C and smaller astronomy cameras. The use of FPL51 and lanthanum glass in the objective minimizes chromatic aberration for high-contrast images with true-to-life color.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eImaging-Ready Mechanics: 2.5\" Focuser and 127.5mm Back Focus\u003c\/h3\u003e\n\u003cp\u003eEngineered for astrophotography, the SV503 70 features a robust 2.5\" rack-and-pinion (RAP) focuser capable of supporting heavy camera packages without flexure or slippage. A critical feature for imagers is the 127.5mm (5\") of working distance available from the 2\" receptacle. This generous back focus provides ample room for adding accessories like filter wheels, off-axis guiders, and rotators into your optical train, while the M54x0.75 female thread offers a direct, secure connection.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eWide-Field Astrograph: 474mm Focal Length for Large Targets\u003c\/h3\u003e\n\u003cp\u003eWith its 474mm focal length, the SV503 70 is ideal for capturing expansive celestial objects that are too large for longer telescopes. This field of view is perfectly suited for framing the entirety of the Andromeda Galaxy (M31), the North American Nebula (NGC 7000), or vast star-forming regions in Cygnus. The f\/6.78 focal ratio provides a good balance between image scale and exposure time, making it an efficient instrument for gathering light on faint deep-sky targets.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eSV503 70 vs. a Standard ED Doublet: Integrated Flattener Advantage\u003c\/h3\u003e\n\u003cp\u003eWhile a standard 70mm ED doublet refractor may have a lower initial cost, it requires a separate field flattener to achieve the same photographic results as the SV503 70. This adds complexity and potential frustration in getting the spacing correct. The SV503's integrated quadruplet design offers a significant advantage:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eNo Spacing Calculation:\u003c\/strong\u003e The flattener is built-in and permanently fixed at the optimal distance. You simply attach your camera and focus.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReduced Connections:\u003c\/strong\u003e A simpler, more rigid imaging train means less potential for tilt or flexure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCost-Effective System:\u003c\/strong\u003e When factoring in the price of a quality external flattener, the SV503 70 often represents a better total value for a complete imaging setup.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat size camera sensor is the SVBONY SV503 70 best suited for?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe SVBONY SV503 70 provides a fully corrected, flat-field image circle of \u003cstrong\u003e32mm\u003c\/strong\u003e. This is ideal for cameras with APS-C format sensors and any smaller sensors, ensuring sharp, pinpoint stars from corner to corner without vignetting.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the SVBONY SV503 70 for visual observing out of the box?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo. This telescope is an astrograph, meaning its focus point is optimized for a camera sensor placed far behind the focuser. To use it visually with an eyepiece, you will need to add a \u003cstrong\u003ediagonal or a 2\" extension tube\u003c\/strong\u003e to achieve focus.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow would the SV503 70 frame a large target like the Andromeda Galaxy (M31)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe \u003cstrong\u003e474mm focal length\u003c\/strong\u003e of the SV503 70 is perfectly matched for large targets. When paired with a typical APS-C camera, it allows you to capture the entire Andromeda Galaxy (M31) and its satellite galaxies M32 and M110 in a single, well-composed frame.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat accessories can I connect to the SV503 70's 2.5\" focuser?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe focuser terminates in a 2\" receptacle and also has a female \u003cstrong\u003eM54x0.75 thread\u003c\/strong\u003e for direct connections. With \u003cstrong\u003e127.5mm of back focus\u003c\/strong\u003e, it provides ample space to install a complete imaging train, including:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eFilter wheels or filter drawers\u003c\/li\u003e\n\u003cli\u003eOff-axis guiders (OAGs)\u003c\/li\u003e\n\u003cli\u003eField rotators\u003c\/li\u003e\n\u003cli\u003eYour astronomy camera\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the SVBONY SV503 70 a good choice for imaging nebulae from my backyard?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. Its \u003cstrong\u003ef\/6.78 focal ratio\u003c\/strong\u003e is efficient for collecting data on faint nebulae. From a light-polluted location, pairing the SV503 70 with a duo-narrowband filter is highly effective for isolating the hydrogen-alpha and oxygen-III signals of emission nebulae like the Lagoon Nebula (M8) or the Eagle Nebula (M16).\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat kind of mount do I need for the SVBONY SV503 70?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe telescope tube and its included accessories weigh only \u003cstrong\u003e5.9 lbs (2685g)\u003c\/strong\u003e. This lightweight design makes it an excellent match for portable German equatorial mounts with a payload capacity of 10-15 lbs or more, such as a Sky-Watcher Star Adventurer GTi or similar tracker.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eSVBONY\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAperture\u003c\/td\u003e\n\u003ctd\u003e70mm \/ 2.8\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length\u003c\/td\u003e\n\u003ctd\u003e474mm \/ 18.7\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Ratio\u003c\/td\u003e\n\u003ctd\u003ef\/6.78\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eObjective Type\u003c\/td\u003e\n\u003ctd\u003e2-Element ED lens with FPL51 and lanthanum special glass\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCorrector\u003c\/td\u003e\n\u003ctd\u003e2-element corrector installed in the tube\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCorrected Image Circle\u003c\/td\u003e\n\u003ctd\u003e32mm \/ 1.3\" (100% correction)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocuser\u003c\/td\u003e\n\u003ctd\u003e2.5\" RAP focuser with 2\" reduction adapter and M54x0.75 female thread\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWorking Distance\u003c\/td\u003e\n\u003ctd\u003e127.5mm \/ 5\" (from 2\" receptacle)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTube Length (min)\u003c\/td\u003e\n\u003ctd\u003e365mm \/ 14.4\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTube Diameter\u003c\/td\u003e\n\u003ctd\u003e82mm \/ 3.2\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDew Shield Diameter\u003c\/td\u003e\n\u003ctd\u003e93mm \/ 3.7\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTube Weight (incl. accessories)\u003c\/td\u003e\n\u003ctd\u003e2685g \/ 5.9lb\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/SVBONY_SV503_Manual.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Manual\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eSV503 70mm f\/6.78 OTA\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e2\" to 1.25\" Adapter\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eLens Cover\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eTelescope Tube Rings\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1 Pair\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDovetail Plate\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e1.25\" Dust Cover\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/SVBONY_SV503_Manual.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Manual\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/svbony-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eSVBONY Warranty Policy\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SVBONY","offers":[{"title":"Default Title","offer_id":52861225042205,"sku":"SV-F9359E","price":503.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/SVBONY-Flatfield-Refractor-Telescope-for-Astrophotography-SV503-70-1_8e5ac16e-a3b5-434c-af5c-80477adf5d6c.jpg?v=1788884053"}],"url":"https:\/\/davidastro.com\/fr-us\/collections\/svbony-sv503-ed-refractor-telescopes.oembed","provider":"David Astro","version":"1.0","type":"link"}