• SVBONY SV503 70mm f/6.78 Quadruplet Refractor Telescope — High-Performance Refractor for Astrophotography
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SVBONY SV503 70mm f/6.78 Quadruplet Refractor Telescope — High-Performance Refractor for Astrophotography

SVBONY SV503 70mm f/6.78 Quadruplet Refractor Telescope — High-Performance Refractor for Astrophotography

$509.99
$509.99
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The SVBONY SV503 70mm f/6.78 quadruplet is a compact astrophotography refractor telescope with a field flattener built right into its optics. A "quadruplet" uses four lens elements, so it corrects colour and flattens the image field in one unit — meaning pinpoint, colour-true stars all the way to the corners of your camera sensor, with no separate flattener to buy or space correctly.

With a 70mm aperture and a fast 474mm focal length (f/6.78), it's small and light enough for star trackers and travel while gathering light quickly for shorter exposures on wide deep-sky targets.

Who it's for: Astrophotographers who want a grab-and-go, flat-field imaging scope that's ready to shoot out of the box. Learn the fundamentals in our beginner's guide to astrophotography.

  • Quadruplet flat-field optics: four elements (FPL51 + lanthanum glass) correct colour and flatten the field.
  • Integrated flattener: no separate field flattener needed — sharp stars corner to corner.
  • Fast f/6.78: 474mm focal length frames large nebulae and galaxies brightly.
  • 2" dual-speed Crayford focuser: 1:10 fine focus for precise, repeatable focusing.
  • Travel-friendly: compact and light for star trackers and portable rigs.

What you'll see: As a wide-field astrograph, the SV503 70 quadruplet shines on large deep-sky targets — nebulae, galaxies and star clusters — captured with flat, colour-accurate fields. Visually it also gives bright, sharp wide-field views of the Moon and rich starfields, though its short focal length favours low-to-medium magnification.

Specifications
Optical design Quadruplet flat-field refractor (4 elements, 2 groups)
Aperture 70mm
Focal length 474mm
Focal ratio f/6.78
Glass FPL51 + lanthanum, fully multi-coated
Field flattener Integrated (no separate flattener needed)
Focuser 2" dual-speed Crayford (1:10 fine)

What is a quadruplet refractor?
It's a four-element refractor that combines colour correction and field flattening in one optical unit, so stars stay sharp and round across your whole sensor without an add-on flattener.

Do I still need a field flattener?
No — the flattener is built in, which is a big advantage for beginners who want to start imaging without extra spacing calculations.

Is it good for beginners in astrophotography?
Yes. Its fast optics, flat field and light weight make it an easy, forgiving scope to learn deep-sky imaging with on a small tracking mount.

Does it come with a mount?
This is an optical tube; pair it with a tracking equatorial mount or star tracker for astrophotography.

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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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