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Orion Telescopes
Orion 0.8x Reducer-Flattener, EON 130mm ED Triplet Refractor
Accepted Payment
Expected Ship Date: 08/23/2024

  • Minimizes field curvature to render exceptionally flat images with sharp stars across the entire image frame, even for full frame cameras (36x24mm sensor)
  • Reduces the effective focal length 20%, from 910mm to 728mm (f/7.0 to f/5.6), for a wider field and shorter exposure times
  • Threads onto focuser drawtube for a tight, highly secure fit
  • Male threads on camera side are 48mm - wider than standard 42mm T-threads - to minimize vignetting even on full frame sensors
  • 55mm backfocus distance and fully multi-coated optics

Learn more
Item #  08933b

The Orion 0.8x Reducer-Flattener for EON 130mm ED Triplet Refractor will ensure wonderfully sharp photographs edge to edge with our premium EON 130 Apo. All refractors produce some amount of field curvature, which results in elongation of star images at the edges of the image frame. An optical flattener is recommended to correct for this. The 0.8x Reducer-Flattener provides excellent field correction (flattening), yielding sharp stars out to the edge of even a full-frame camera sensor. It also reduces the effective focal length of the EON 130 by 20 percent - from 910mm to 728mm (f/7.0 to f/5.6) - yielding a wider field and brighter images, and allowing shorter exposure times for astrophotography.

Designed solely for photographic use, the 0.8x Reducer-Flattener threads directly onto the EON's focuser drawtube after removal of the accessory collar. This threaded connection ensures a secure fit that will not introduce flexure. The male threads on the camera side of the 0.8x Reducer-Corrector are 48mm in diameter. They are wider than standard 42mm T-mount threads. The wider 48mm aperture reduces the likelihood of vignetting of the image, especially when using a full-frame camera sensor.

The 0.8x Reducer-Flattener has a 55mm backfocus distance. To produce a focused image, your camera's sensor must be positioned 55mm from the housing flange. Most DSLR cameras, when used with a T-ring, have the requisite 55mm backfocus distance. For astronomical cameras, which have their sensor closer to the front opening of the camera, one or more spacer rings (sold separately) will be needed between the camera and the Reducer-Flattener to achieve the 55mm requirement. Consult your camera's manual to determine how far back the sensor is recessed. Subtract that number from 55mm to get the length of spacing needed to reach 55mm backfocus distance.

The optics of the 0.8x Reducer-Flattener are fully multi-coated for maximum light transmission. Compatible with EON 130mm ED equipped with 2.5" R&P focuser only. Not compatible with older EON 130mm ED model with 3" Crayford focuser.


Limited Warranty against defects in materials or workmanship for one year from date of purchase. This warranty is for the benefit of the original retail purchaser only. For complete warranty details contact us at 800-447-1001.

Product Support
Visit our product support section for instruction manuals and more
  • User level
  • Coatings
    Fully multi-coated
  • Mounting
  • Warranty
    One year

0.8x Reducer-Flattener
Rubber dust caps (x2)

Orders received by 1pm Eastern Standard Time for in-stock items ship the same business day. Order received after noon will ship the next business day. When an item is not in-stock we will ship it as soon as it becomes available. Typically in-stock items will ship first and backordered items will follow as soon as they are available. You have the option in check out to request that your order ship complete, if you'd prefer.

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