{"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","url":"https:\/\/ontariotelescope.com\/products\/svbony-sv503-80ed-f7-doublet-refractor-ota","provider":"Ontario Telescope and Accessories","version":"1.0","type":"link"}