Orion 0.85x Reducer-Flattener (ED100)

Orion 0.85x Reducer-Flattener (ED100)
$161.99
Item # OR-5196
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  • Focal Reducer designed specifically for the Orion's ED100 apochromatic refractor.
  • The Orion 0.85x Reducer-Flattener reduces the effective focal length of the ED100 refractor telescope from 900mm to 765mm - changes focal ratio from f/9.0 to f/7.65.
  • Excellent for astrophotography use with DSLR cameras housing imaging chips as large as 36mm x 24mm.
  • Two-element lens assembly, with one element made from ED glass.
  • Fully multi-coated optics (all air-to-glass surfaces are multi-layer coated).
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Orion 0.85x Reducer-Flattener(ED 100)


If you're an astrophotographer seeking even better performance from your Orion 100mm ED Refractor Telescope, the Orion 0.85x Reducer-Corrector is for you. Designed specifically for use with this telescope and a DSLR camera, it reduces the scope's effective focal length to produce a faster system, which allows shorter exposure times. It also provides excellent field correction (flattening), yielding sharp stars out to the edge of a camera chip as large as 36mm x 24mm. That's even larger than the APS-C size chip found in DSLRs used most often by astrophotographers.

The Orion 0.85x Focal Reducer-Corrector achieves the nominal 55mm distance required from the optics to the DSLR's sensor for critical focus. It 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 reduces the focal length from 900mm to 765mm (f/9.0 to f/7.65), producing a faster system for improved astrophotograpy.

The Reducer-Corrector threads onto the focuser drawtube's male threads for a secure fit that will not introduce flexure. T-threads on the camera side accept your camera's T-ring. You will need a "wide" T-ring for your brand of camera, sold separately.

For owners of Orion's ED100 refractor who want to take astrophotos, this is a must-have accessory. It works well for daytime terrestrial photography too! Includes two thread-on lens caps.

Additional Information

Additional Information

SKU OR-5196
Manufacturer Orion
Barrel Size Thread-on
Warranty Limited Warranty
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Included Items

Included Items

  • Orion 0.85x Reducer-Flattener (ED100)
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