• SVBONY SV193 2" 0.8x Focal Reducer for SV503 80ED Telescope — Widen Your Field of View for Deep-Sky Imaging
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SVBONY SV193 2" 0.8x Focal Reducer for SV503 80ED Telescope — Widen Your Field of View for Deep-Sky Imaging | Telescope Wolves

SVBONY SV193 2" 0.8x Focal Reducer for SV503 80ED Telescope — Widen Your Field of View for Deep-Sky Imaging | Telescope Wolves

$89.99
$89.99
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The SVBONY SV193 2" 0.8x focal reducer and field flattener is an astrophotography accessory that makes your SV503 80ED refractor faster and its images flatter. A focal reducer shortens the effective focal length — here from 560mm (f/7) to about 448mm (f/5.6) — so you capture a wider field and gather light more quickly, shortening the exposures needed for the same result.

It also acts as a field flattener, correcting the natural curvature that makes stars look stretched toward the corners of a refractor's frame. The result is pinpoint stars from centre to edge across full-frame sensors.

Who it's for: Deep-sky imagers using the SVBONY SV503 70/80/102 f/7 ED refractors who want a wider, faster, corner-to-corner-sharp field. Learn the fundamentals in our beginner's guide to astrophotography.

  • 0.8x reduction: converts the SV503 80ED from 560mm f/7 to about 448mm f/5.6 for wider, faster imaging.
  • Field flattener: corrects edge-of-field curvature so stars stay round to the corners.
  • Full-frame coverage: illuminates full-frame sensors when spaced correctly.
  • FMC optics: three elements in three groups, fully multi-coated for high transmission.
  • Standard connections: 2" front socket to the scope, M48x0.75 thread to the camera.
Specifications
Type 0.8x focal reducer / field flattener
Reduction SV503 80ED: 560mm f/7 → approx. 448mm f/5.6
Optics 3 elements in 3 groups, fully multi-coated
Compatibility SV503 70/80/102mm f/7 ED refractors
Connections 2" socket (scope) / M48x0.75 (camera)
Sensor coverage Up to full-frame

What does a 0.8x focal reducer do?
It shortens the telescope's focal length, giving a wider field and a faster focal ratio so you can capture more sky in shorter exposures.

Why does it also flatten the field?
Refractors naturally curve the focal plane; the built-in flattener corrects this so stars stay sharp and round out to the edges of your sensor.

Which scopes is it for?
It's designed for the SVBONY SV503 70mm, 80mm and 102mm f/7 ED refractors.

Do I need specific spacing?
Yes — set the correct back-focus distance to the sensor (typically around 55mm for DSLRs) for the flattest field.

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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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