{"title":"SVBONY SV503 \/ SV530 ED Refractors","description":"\u003cp\u003eSVBONY SV503 70, 80 and 102 ED doublets and the SV530 80ED, as OTAs and kits, for colour-corrected visual observing and entry-level imaging. Part of \u003ca href=\"\/collections\/svbony-telescopes\"\u003eSVBONY Telescopes\u003c\/a\u003e.\u003c\/p\u003e","products":[{"product_id":"svbony-sv503-70ed-flat-field-refractor-ota","title":"SVBONY SV503 70ED f\/6.78 Flat-Field ED Refractor Telescope OTA","description":"\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6388370617148740884701493.webp?v=1791669786\" alt=\"SVBONY SV503 70ED flat-field refractor with built-in two-element field flattener\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThe SVBONY SV503 70ED is a 70 mm f\/6.78 extra-low-dispersion doublet refractor with a 474 mm focal length and a two-element field corrector built into the tube. Because the flattener is already in the optical path, the telescope delivers a corrected, flat field 32 mm across without a separate corrector or spacer calculation, which makes it a compact, ready-to-image wide-field astrograph that also works well visually.\u003c\/p\u003e\n\u003cp\u003eThe objective combines FPL51 ED glass with a lanthanum special-glass element. The 2.5″ rack-and-pinion focuser has coarse and fine knobs, a 2″ reduction adapter and an M54x0.75 female thread, and the dew shield retracts for storage. SVBONY lists the tube at 2685 g (5.9 lb) including accessories.\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6388152055534958084994129.jpg?v=1791669786\" alt=\"SVBONY SV503 70ED 70mm f\/6.78 aperture and focal ratio panel\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThis is a good match if you:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eWant a small refractor that images without extra correctors:\u003c\/strong\u003e the built-in flattener removes the spacing step that external flatteners need.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eImage wide fields:\u003c\/strong\u003e 474 mm suits large nebulae, star fields and the bigger galaxies such as M31.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTravel or set up quickly:\u003c\/strong\u003e a 365 mm minimum tube length and under 3 kg fit small mounts and star trackers with suitable payload.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAlso observe:\u003c\/strong\u003e with a diagonal and eyepiece it gives sharp, low-colour wide-field views.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e70 mm f\/6.78 ED doublet:\u003c\/strong\u003e FPL51 and lanthanum special glass to control chromatic aberration.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBuilt-in two-element corrector:\u003c\/strong\u003e a 32 mm flat field with 100% correction, per SVBONY.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e2.5″ rack-and-pinion focuser:\u003c\/strong\u003e dual-speed knobs, 2″ reduction adapter, M54x0.75 female thread.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCNC-machined threads and bayonets:\u003c\/strong\u003e keep components aligned on the optical axis.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRetractable dew shield:\u003c\/strong\u003e adjustable length, 93 mm diameter, to block stray light and slow dew.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRings and dovetail included:\u003c\/strong\u003e a pair of tube rings and a dovetail plate come with the OTA.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6388152055595151626875041.jpg?v=1791669786\" alt=\"SVBONY SV503 70ED FPL51 ED glass objective panel\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eOptical and Mechanical Design\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eA conventional doublet focuses onto a curved surface, so stars toward the edge of a camera sensor elongate unless a separate flattener is fitted at a precise distance. In the SV503 70ED, SVBONY installs a two-element corrector inside the tube, at the correct position for the objective, and specifies a 32 mm corrected circle. That covers APS-C-sized and smaller astronomy camera sensors. The working distance is 127.5 mm from the 2″ receptacle, so the camera needs no further corrector spacing.\u003c\/p\u003e\n\u003cp\u003eThe ED objective pairs FPL51 with a lanthanum element to bring colours to a common focus. The 2.5″ focuser carries the weight of a camera and filter train, and its fine knob makes precise focus at the sensor straightforward.\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6388152055633744358730046.jpg?v=1791669786\" alt=\"SVBONY SV503 70ED coarse and fine focus knobs\" 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\/6388152055662702417666534.jpg?v=1791669786\" alt=\"SVBONY SV503 70ED 2.5 inch rack-and-pinion focuser detail\" 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\/6388152055691602675505988.jpg?v=1791669786\" alt=\"SVBONY SV503 70ED focuser close-up\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eWide-field deep-sky imaging:\u003c\/strong\u003e large emission nebulae, the Milky Way's star clouds and big galaxies with a dedicated astronomy camera.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNarrowband imaging:\u003c\/strong\u003e with filters in the 2″ or M54 train.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePortable imaging:\u003c\/strong\u003e on compact equatorial mounts for travel and dark-site trips.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVisual observing:\u003c\/strong\u003e wide, flat star fields with a diagonal and eyepiece.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6388152055720417723956428.jpg?v=1791669786\" alt=\"SVBONY SV503 70ED CNC-machined threads and bayonets\" 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\/6388152055777188927520953.jpg?v=1791669786\" alt=\"SVBONY SV503 70ED retractable dew shield\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCamera connection:\u003c\/strong\u003e M54x0.75 female thread on the focuser, plus a 2″ receptacle; working distance 127.5 mm from the 2″ receptacle.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVisual use:\u003c\/strong\u003e SVBONY notes that a diagonal or an extension tube is needed to reach focus. A 2″-1.25″ adapter is included.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSensor coverage:\u003c\/strong\u003e the 32 mm flat field suits sensors up to that diagonal.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMounting:\u003c\/strong\u003e the supplied rings and dovetail fit Vixen-style saddles.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDew control:\u003c\/strong\u003e the 82 mm tube and 93 mm dew shield suit a dew heater strip; a matching SVBONY strip is among the add-ons on this page.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eSVBONY also pairs this tube with its SV215 zoom eyepiece, a diagonal and a finder as a visual kit. If you want help matching a camera or filter train to the 127.5 mm working distance, send us your setup.\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6388152055833357444592065.jpg?v=1791669786\" alt=\"SVBONY SV503 70ED OTA with SV215 zoom eyepiece visual bundle\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eWhat's in the Box\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e1 x SV503 70 f\/6.78 OTA\u003c\/li\u003e\n\u003cli\u003e1 x 2″-1.25″ adapter\u003c\/li\u003e\n\u003cli\u003e1 x lens cover\u003c\/li\u003e\n\u003cli\u003e1 x pair of telescope tube rings\u003c\/li\u003e\n\u003cli\u003e1 x dovetail plate\u003c\/li\u003e\n\u003cli\u003e1 x 1.25″ dust cover\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOptical tube only:\u003c\/strong\u003e no mount, diagonal, eyepiece or finder is included.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFocus for visual use:\u003c\/strong\u003e reaching focus with an eyepiece needs a diagonal or extension tube.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNo separate flattener required:\u003c\/strong\u003e the corrector is built in, so an external flattener is not part of the imaging train.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eFrequently Asked Questions\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eIs it difficult to set up?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eNo. Mount it by the supplied rings and dovetail, thread or clamp a camera on the focuser and focus. With the flattener built in, there is no corrector spacing to work out.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDo I need a field flattener for imaging?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eNo. The two-element corrector inside the tube gives a 32 mm flat field.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the working distance?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e127.5 mm from the 2″ receptacle.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan I use it visually?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eYes, with a diagonal or an extension tube to reach focus.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow heavy is it?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e2685 g (5.9 lb) including accessories, per SVBONY.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eIn short: a 70 mm f\/6.78 ED doublet with its flattener built into the tube, giving a 32 mm flat field at 474 mm in a 2685 g package. Add a mount and a camera, or a diagonal and eyepiece, and it is ready to use.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003ePerformance Data\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eSVBONY publishes an interferometer report for the upgraded SV503 70ED OTA.\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6388542274366716395689892.webp?v=1791669786\" alt=\"SVBONY SV503 70ED upgraded OTA interferometer test report\" 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\/6388577507018417835308924.jpg?v=1791669786\" alt=\"SVBONY SV503 70ED interference report data\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e","brand":"SvBony","offers":[{"title":"OTA","offer_id":67722208313455,"sku":"F9359E","price":511.58,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/sv503-f9359e-1_20251125135655_4795.webp?v=1791670041"},{"product_id":"svbony-sv503-80ed-f7-doublet-refractor-ota","title":"SVBONY SV503 80ED f\/7 ED Doublet Refractor Telescope OTA","description":"\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6385916468716665477197960.jpg?v=1791670064\" alt=\"SVBONY SV503 80ED f\/7 ED doublet refractor OTA key visual\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThe SVBONY SV503 80ED is an 80 mm f\/7 extra-low-dispersion doublet refractor with a 560 mm focal length. The objective uses an S-FPL51 ED element in an air-spaced two-element design with ultra-wideband coatings, and the 2″ dual-speed rack-and-pinion focuser rotates through 360°. It is built for both observing and astrophotography, in a white aluminum tube with a 103 mm outer diameter and a listed weight of 3950 g.\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6385916470682451337679882.jpg?v=1791670064\" alt=\"SVBONY SV503 80ED 80mm aperture light-gathering panel\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThis is a good match if you:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eWant one refractor for viewing and imaging:\u003c\/strong\u003e 560 mm at f\/7 frames many nebulae and galaxies and gives crisp views of the Moon and planets.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAre starting in astrophotography:\u003c\/strong\u003e an 80 mm ED doublet is a forgiving size for a first imaging scope on a modest equatorial mount.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrefer a grab-and-go telescope:\u003c\/strong\u003e under 4 kg and quick to cool, it suits garden sessions and travel.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e80 mm f\/7 ED doublet:\u003c\/strong\u003e S-FPL51 extra-low-dispersion glass for good colour correction.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUltra-wideband coatings:\u003c\/strong\u003e on the objective for high light transmission.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e2″ dual-speed focuser:\u003c\/strong\u003e rack-and-pinion with a 1:10 fine-focus ratio.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e360° rotating focuser:\u003c\/strong\u003e turn a camera to frame a target or an eyepiece to a comfortable angle.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAluminum tube:\u003c\/strong\u003e 103 mm outer diameter.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6385916489227924086884170.jpg?v=1791670064\" alt=\"SVBONY SV503 80ED S-FPL51 ED lens chromatic aberration control\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eOptical and Mechanical Design\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThe SV503 80ED pairs an S-FPL51 extra-low-dispersion element with a second element in an air-spaced doublet. ED glass disperses colours more evenly than standard crown glass, so blue and red light come to focus much closer to green and bright objects show little false colour. At f\/7 the residual colour of an FPL51 doublet is low enough for colour imaging with a suitable flattener. SVBONY lists 1.5 arcseconds resolution, limiting magnitude 11.6 and 130.6x light-gathering power.\u003c\/p\u003e\n\u003cp\u003eThe focuser is a 2″ rack-and-pinion design with a coarse knob and a 1:10 fine knob, and the whole drawtube rotates so a camera can be squared to the frame without loosening the train.\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6385916486516701761528703.jpg?v=1791670064\" alt=\"SVBONY SV503 80ED dual-speed 2 inch rack-and-pinion focuser\" 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\/6385916492425226874600761.jpg?v=1791670064\" alt=\"SVBONY SV503 80ED 360 degree rotating focuser\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDeep-sky astrophotography:\u003c\/strong\u003e emission nebulae, galaxies and clusters, with a flattener for a flat field.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVisual observing:\u003c\/strong\u003e wide, sharp star fields and high-contrast lunar and planetary views.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDaytime and nature viewing:\u003c\/strong\u003e with a correct-image diagonal.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6385916494298629561667560.jpg?v=1791670064\" alt=\"SVBONY SV503 80ED for deep-space astrophotography\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlattener:\u003c\/strong\u003e SVBONY offers this OTA with its SV193 0.8x reducer\/flattener for imaging.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVisual accessories:\u003c\/strong\u003e a 2″ or 1.25″ diagonal and eyepieces are needed; SVBONY also pairs the tube with the SV182 finder and SV211 handle bar.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMounting:\u003c\/strong\u003e the tube mounts by dovetail on alt-azimuth or equatorial mounts. SVBONY's SV225 alt-azimuth mount is one of the add-ons on this page.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCameras and dew control:\u003c\/strong\u003e the add-ons on this page include SVBONY cameras and a dew heater strip sized for this tube.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eIf you want help choosing a flattener, camera or spacing for your setup, send us your equipment list and we will work it out with you.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eWhat's in the Box\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e1 x SV503 white 80ED f\/7 telescope OTA\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOptical tube only:\u003c\/strong\u003e no mount, diagonal, eyepiece or finder is included. The add-ons on this page cover visual kits, cameras, a mount and a dew strip.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eField flatness for imaging:\u003c\/strong\u003e like any doublet, the native field is curved; the SV193 flattener corrects it for larger sensors.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDimensions:\u003c\/strong\u003e SVBONY lists 540 x 215 x 230 mm.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eFrequently Asked Questions\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eIs it difficult to set up?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eNo. Attach it to a mount by its dovetail, add a diagonal and eyepiece or a camera, and focus. The optics need no collimation.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs it for visual use or imaging?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eBoth. SVBONY designs the SV503 80ED for observing and astrophotography.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDo I need a flattener?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eFor visual use, no. For imaging with larger sensors, the SV193 0.8x reducer\/flattener gives round stars to the edge and a wider field.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow heavy is it?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e3950 g, per SVBONY.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat magnification can it reach?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eWith 560 mm focal length, a 10 mm eyepiece gives 56x and a 5 mm gives 112x.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eIn short: an 80 mm f\/7 FPL51 ED doublet with a rotating dual-speed 2″ focuser, suited to both visual observing and deep-sky imaging. Add a mount and either visual accessories or a flattener and camera, and it is ready to use.\u003c\/p\u003e","brand":"SvBony","offers":[{"title":"SV503 80ED","offer_id":67722242490479,"sku":"F9359B","price":568.58,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/f9359b-1_20251124085012_2480.webp?v=1791670183"},{"product_id":"svbony-sv503-102ed-f7-doublet-refractor-ota","title":"SVBONY SV503 102ED f\/7 ED Doublet Refractor Telescope OTA","description":"\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6385864033860635259317905.jpg?v=1791670166\" alt=\"SVBONY SV503 102mm f\/7 ED refractor OTA key visual\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThe SVBONY SV503 102ED is a 102 mm (4.01″) ED doublet refractor with a 714 mm focal length at f\/7. Its objective uses an S-FPL51 extra-low-dispersion element with SMC multi-coatings, and the CNC-machined aluminium tube carries a 2″ rack-and-pinion focuser with 1:10 fine movement and a retractable lens hood.\u003c\/p\u003e\n\u003cp\u003eSVBONY lists a tube weight of 5.7 kg with rings, a 121 mm tube outer diameter, a 630 mm OTA length and a 200 mm dovetail on the rings. A 2″ to 1.25″ adapter is included for eyepieces and cameras.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThis is a good match if you:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eWant a 4″ refractor for both viewing and imaging:\u003c\/strong\u003e 102 mm at f\/7 covers lunar and planetary work and larger deep-sky targets.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eValue true colour:\u003c\/strong\u003e the ED element keeps bright stars and planets free of heavy false colour.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eImage nebulae and galaxies:\u003c\/strong\u003e SVBONY positions the SV503 102 for astrophotography and deep-sky stargazing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAre stepping up from a smaller refractor:\u003c\/strong\u003e more aperture and resolution in a tube that still travels.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eS-FPL51 ED doublet:\u003c\/strong\u003e reduces chromatic aberration for colour-true views and images.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e2″ dual-speed rack-and-pinion focuser:\u003c\/strong\u003e 1:10 fine control, built to support cameras and heavier accessories.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1.17 arc-second resolving capacity:\u003c\/strong\u003e with limiting magnitude 12.1 and 212x light-gathering capacity.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCNC-machined aluminium tube:\u003c\/strong\u003e finished in fine-grained paint, with a retractable lens hood.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOTA rings with 200 mm dovetail:\u003c\/strong\u003e for direct mounting.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1.25″ and 2″ compatibility:\u003c\/strong\u003e 2″ to 1.25″ adapter included.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6385864040112857103443120.jpg?v=1791670166\" alt=\"SVBONY SV503 102 dual-speed rack-and-pinion focuser\" 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\/6386769643222033447886939.jpg?v=1791670166\" alt=\"SVBONY SV503 102 focuser close-up\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eOptical Design\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThe SV503 102 is a two-element refractor with one S-FPL51 ED element. ED glass disperses colour far less than standard crown glass, so red, green and blue focus much closer together and the violet halo typical of achromats is greatly reduced on bright stars, the Moon and planets. SMC multi-coatings keep transmission high and the background dark.\u003c\/p\u003e\n\u003cp\u003eThe 102 mm aperture gives 1.17 arc-second resolution by SVBONY's figure and a maximum useful magnification of 204x, while f\/7 keeps the field wide enough for nebulae, clusters and galaxies.\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6385864038539926774599361.jpg?v=1791670166\" alt=\"SVBONY SV503 102 S-FPL51 ED extra-low dispersion glass\" 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\/6385864043011957137062661.jpg?v=1791670166\" alt=\"SVBONY SV503 102 1.17 arc-second resolution panel\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDeep-sky astrophotography:\u003c\/strong\u003e nebulae, galaxies and clusters at 714 mm, with a matched flattener for wide sensors.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLunar and planetary observing:\u003c\/strong\u003e high-contrast, colour-true views up to 204x.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVisual deep-sky observing:\u003c\/strong\u003e 2″ wide-field eyepieces on the 2″ focuser.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDouble stars:\u003c\/strong\u003e 1.17 arc-second resolution for close pairs.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBack focus:\u003c\/strong\u003e SVBONY's specification table lists 101.9 mm; its description text quotes 90 mm. If you are spacing a corrector and camera, send us your setup and we will work out the figure with you.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAccessories:\u003c\/strong\u003e 2″ accessories fit directly; 1.25″ eyepieces use the included adapter.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eImaging upgrades:\u003c\/strong\u003e SVBONY pairs the SV503 102 with its SV209 flattener and with deep-sky imaging trains; the add-on options on this page cover those pairings.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMounting:\u003c\/strong\u003e rings and a 200 mm dovetail. At 5.7 kg with rings, plan on a mid-size equatorial mount for imaging.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6385864044467581197896811.jpg?v=1791670166\" alt=\"SVBONY SV503 102 compatible with 1.25 and 2 inch adapters\" 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\/6386597217573448576905193.jpg?v=1791670166\" alt=\"SVBONY SV503 102 OTA rings with dovetail\" 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\/F9359D2_20260116102029_3372.webp?v=1791670166\" alt=\"SVBONY SV503 102 ED refractor OTA detail panel\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eWhat's in the Box\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eSVBONY's key features list for the OTA style:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eSV503 102 f\/7 ED OTA with rings and 200 mm dovetail\u003c\/li\u003e\n\u003cli\u003e2″ to 1.25″ adapter\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOptical tube only:\u003c\/strong\u003e no mount, diagonal, eyepiece or corrector is included. SVBONY also offers OTA-FR and OTA-FR-Handle styles; ask us if you would like one.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlat field:\u003c\/strong\u003e as with any doublet, a matched flattener gives the flattest corners on larger sensors.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 5.7 kg with rings, plus camera or diagonal, is worth accounting for in your mount payload.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDew:\u003c\/strong\u003e the retractable hood helps, and a dew heater keeps the objective clear on humid nights.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eFrequently Asked Questions\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eIs it difficult to set up?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eNo. The rings and dovetail drop into the mount saddle, and the focuser takes 2″ or 1.25″ accessories. A refractor needs no collimation.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs it for imaging or visual?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eBoth. SVBONY designs the SV503 102 for astrophotography and deep-sky stargazing, and it performs well visually on the Moon and planets.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat ED glass does it use?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eS-FPL51, in a doublet with SMC coatings.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDo I need a flattener?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eFor visual use, no. For imaging on larger sensors, a matched flattener such as the SVBONY SV209 gives flatter corners.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow heavy is it?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e5.7 kg with rings, per SVBONY.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eIn short: a 102 mm f\/7 S-FPL51 ED doublet with a 2″ dual-speed focuser, rings and a 200 mm dovetail, for colour-true visual observing and deep-sky imaging. Add a mount, and a flattener and camera for imaging.\u003c\/p\u003e","brand":"SvBony","offers":[{"title":"OTA","offer_id":67722413473903,"sku":"F9359D","price":748.13,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/f9359d-1_20251124084750_2001.webp?v=1791670990"}],"url":"https:\/\/ontariotelescope.com\/collections\/svbony-sv503-ed.oembed","provider":"Ontario Telescope and Accessories","version":"1.0","type":"link"}