• SVBONY SV209 0.8x Focal Reducer for Telescopes — Increase Field of View for Deep-Sky Astrophotography
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SVBONY SV209 0.8x Focal Reducer for Telescopes — Increase Field of View for Deep-Sky Astrophotography | Telescope Wolves

SVBONY SV209 0.8x Focal Reducer for Telescopes — Increase Field of View for Deep-Sky Astrophotography | Telescope Wolves

$198.99
$198.99
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The SVBONY SV209 0.8x focal reducer and field flattener is an astrophotography accessory that widens your field of view and sharpens your stars for deep-sky imaging. A focal reducer shortens the telescope's effective focal length and speeds up its focal ratio, so you capture more sky and gather light faster — cutting the exposure time needed to reach the same depth.

It's designed for the SVBONY SV550 122mm f/7 APO refractor, converting its 854mm f/7 optics to roughly 683mm at f/5.6. As a field flattener it also corrects the natural curvature of a refractor's focal plane, keeping stars round from centre to corner across large sensors.

Who it's for: Deep-sky imagers running the SVBONY SV550 122mm f/7 APO who want a faster, wider, corner-to-corner-sharp field. Learn the fundamentals in our beginner's guide to astrophotography.

  • 0.8x reduction: converts the SV550 122 f/7 from 854mm to about 683mm at f/5.6 for wider, faster imaging.
  • Field flattener: corrects edge-of-field curvature so stars stay round to the corners.
  • Large-sensor coverage: illuminates DSLR and full-frame chips when spaced correctly.
  • Fully multi-coated: high light transmission with suppressed reflections.
  • M63x1 connection: threads into the SV550 imaging train with 55mm back-focus for DSLRs.
Specifications
Type 0.8x focal reducer / field flattener
Reduction SV550 122 f/7: 854mm → approx. 683mm f/5.6
Optics Fully multi-coated
Thread M63x1
Back focus 55mm to image plane
Designed for SVBONY SV550 122mm f/7 APO refractor

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

Which telescope is it for?
It's designed specifically for the SVBONY SV550 122mm f/7 APO refractor.

Does it flatten the field too?
Yes — it corrects the curvature inherent in refractors so stars stay sharp to the corners of large sensors.

What spacing does it need?
Set 55mm of back-focus from the reducer's shoulder to the sensor, the standard spacing for DSLR bodies.

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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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