• SVBONY SV503 102mm f/7 ED Doublet Refractor Telescope OTA — Sharp, Color-Corrected Optics for Visual and Imaging Use
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SVBONY SV503 102mm f/7 ED Doublet Refractor Telescope OTA — Sharp, Color-Corrected Optics for Visual and Imaging Use

SVBONY SV503 102mm f/7 ED Doublet Refractor Telescope OTA — Sharp, Color-Corrected Optics for Visual and Imaging Use

$779.99
$779.99
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The SVBONY SV503 102mm ED doublet is a refractor telescope built around extra-low-dispersion (ED) glass, which sharply reduces the colour fringing that ordinary lenses show around bright objects. With a 102mm aperture and 714mm focal length (f/7), it delivers crisp, high-contrast views and clean, colour-accurate images — a favourite step-up scope for observers moving beyond a basic starter telescope.

An "ED doublet" uses two lens elements, one made of special S-FPL51 ED glass, to bring colours to a tighter focus than a standard achromat. A 2" dual-speed focuser with 1:10 fine focus makes it easy to nail sharp focus for both visual use and photography.

Who it's for: Intermediate observers and imagers who want a versatile, high-quality refractor for the Moon, planets and deep-sky photography. Learn the fundamentals in our beginner's guide to astrophotography.

  • 102mm ED optics: S-FPL51 ED glass for sharp, colour-corrected views with minimal fringing.
  • f/7 focal length: 714mm balances wide-field framing with useful magnification.
  • 2" dual-speed focuser: 1:10 fine focus for precise, repeatable focusing.
  • SMC coatings: ultra-wideband multi-coating for high transmission and contrast.
  • Imaging-ready: generous back focus and a dovetail suit cameras and accessories.

What you'll see: The SV503 102ED shows sharp lunar detail with clean, colour-true edges, Saturn's rings and Jupiter's belts and moons, and pinpoint stars across rich fields. Its ED optics make it excellent for high-magnification planetary work and a strong platform for deep-sky imaging when paired with a matched flattener or reducer.

Specifications
Optical design ED doublet refractor
Aperture 102mm
Focal length 714mm
Focal ratio f/7
Glass / coatings S-FPL51 ED, SMC ultra-wideband multi-coating
Focuser 2" dual-speed (1:10 fine)
Back focus approx. 102mm

What does "ED" mean?
Extra-low-dispersion glass focuses the colours of light more tightly than ordinary glass, greatly reducing the purple fringing seen in basic refractors and producing sharper, cleaner images.

Is it good for astrophotography?
Yes — its ED optics and dual-speed focuser make it a capable deep-sky imaging scope, especially with a matched field flattener or 0.8x reducer.

Does it include a mount?
This is an optical tube; pair it with a tracking equatorial mount for imaging or a sturdy alt-azimuth mount for visual use.

How does an ED doublet compare to a triplet APO?
A triplet corrects colour even further, but a quality ED doublet like this delivers excellent, near-APO views at a more accessible price.

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Frequently Asked Questions

With a beginner telescope you can see a surprising amount — the craters and mountains on the Moon, the rings of Saturn, the moons of Jupiter, and star clusters like the Pleiades. As you get more comfortable, you can also spot nebulae and distant galaxies. Not sure which beginner telescope is right for you? Check out our Telescope Buying Guide.
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