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Orion - Focal Reducer Corrector for ED120 Corrector Telescope


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Availability: Available - Ships in 2-4 Days


Available - Ships in 2-4 Days

Manufactured by: Orion


Orion Focal Reducer Corrector ED120 Corrector Telescope


The 0.85x Reducer-Corrector for the Orion ED120 120mm refractor (#9976) reduces the effective focal length, producing a wider field and brighter images, and allowing shorter exposure times for astrophotography. It also provides excellent field correction (flattening), yielding sharp stars out to the edge of a camera chip as large as 36mm x 24mm, which is even larger than the APS-C size chip housed in the DSLRs most widely used by astrophotographers!


  • Designed for use with Orion's ED120 refractor (#9976) not compatible with the EON 120ED refractor telescope
  • Two-element lens assembly with one element made from ED glass
  • Use with DSLR cameras with chips as large as 36mm x 24mm
  • Reduces the effective focal length from 900mm to 765mm (f/7.5 to f/6.38)
  • Fully multi-coated optics (all air-to-glass surfaces are multi-layer coated)


The Reducer-Corrector is designed exclusively for use with DSLR cameras, providing the nominal 55mm distance required from the optics to the camera sensor to achieve critical focus. You will need a "wide" T-ring for your brand of camera (sold separately).

This astrophotographic accessory features a two-element lens assembly, with one lens made from high-quality extra-low dispersion (ED) glass. The optics are fully multi-coated to minimize light reflection off the lens surfaces. It's designed for use with only the original ED120 refractor, not the EON 120ED. The effective focal length is shortened from 900mm to 765mm (f/7.5 to f/6.38), creating a faster system for improved astrophotographic performance.

The Reducer-Corrector threads onto the focuser drawtube's male threads for a secure fit that will not introduce flexure. Threads on the camera side accept a "wide" T-ring for your camera type.

This is a 'must-have' accessory for better astrophotography with Orion's ED120 refractors. Great for daytime terrestrial photography too!











Additional Information

Name Orion - Focal Reducer Corrector for ED120 Corrector Telescope
Manufacturer Orion
Model ORI-05198
Manufacturer Part No ORI-05198