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Orion Field Flattener for Short Refractors

SKU : OR-08893

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Product Details

  • The Field Flattener for Short Refractors by Orion:

    Optically fast refractor telescopes used for astrophotography are often plagued by significant field curvature, which is especially noticeable when using CCD imagers with APS-C sized and larger sensors, or DSLR cameras. Orion's handy field flattener resolves the issue by providing excellent field correction while preserving the focal length attributes of your telescope. Designed for use with refractors with focal lengths of 400 mm to 650 mm and focal ratios of f/5 to f/7.5, the Orion Field Flattener for Short Refractors lets you enjoy the full imaging potential of your fast refractor telescope. 

    Fully multi-coated, 38 mm clear aperture optics and a glare-reducing threaded interior ensure maximum image contrast. Backfocus of 55 mm is required, we recommend using the Orion T-thread Spacer Ring Kit (sold separately) to achieve proper distance for use with CCD imagers. Use with a DSLR requires a T-ring for the camera (T-ring sold separately). Weighs 7.5-ounces.


    Orion Field Flattener for Short Refractors Features:
    • Eliminate field curvature in short, optically fast refractor telescopes with this handy 38 mm clear-aperture, fully multi-coated field flattener
    • Designed for use with 400 mm to 650 mm focal length refractors with f/5 to f/7.5 focal ratios
    • Optimizes your fast refractor telescope for astrophotography
    • Preserves focal length attributes of the attached refractor telescope while flattening the field of view
    • Requires 55 mm of refractor telescope backfocus, weighs 7.5-ounces
    OPT Product Number: OR-08893
  • specifications

    Free ShippingYes
    WarrantyOrion Limited Warranty

Product Reviews

Customer Reviews
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Filter Reviews:
    Carlos G.
    United States United States

    Orion Field Flattener for Short Refractors

    I use it with a Sky-Watcher EvoStar 72ED. The field flattener works great, no distortion on the edges on my images. Service at OPT is great and fast delivery. Highly recommend it

    OPT Telescopes Orion Field Flattener for Short Refractors Review
    Michael S.
    United States United States

    I'm pleased

    Performance from item is typical of Orion's products, excellent. It attached securely to camera t-adapter with threads. Its body length requires removal of one extension tube. Price is reasonably. Delivery was longer than expected.

    Luciano D.
    Chile Chile

    Almost 2 months of waiting...

    After almost 2 months of waiting, the order finally arrived, I can't wait to test the quality. I only recommend if you buy do not ask for transportation by USPS, horrible service. As for OPT I am very happy with the advice given by the sellers.

    miguel s.

    happy with my purchase

    I did a test taking pictures of M8 and M20 and the stars appear as points in the whole field, does not modify the focal and does not add reflections or color to the image,. Excellent product

    Jeffrey M.
    United States

    Good value for the money

    Provides clearly observable improvement in the flatness of the field of my WO Zenithstar 66 f/5.88 ED refractor. Imaging on an 8300M chip (18x13.5mm, 22.5 mm diagonal), star images are much more round (less oval) to the corners of the field.


    Perfect Addition

    First off, it works great! I photograph through an Orion ED80mmCFT with my DSLR- Pentax K5iiS (APS-C sensor, 23.7 x 15.7 mm). I was experiencing elongated stars near the edges of my photos and was forced to crop them. After my very first shot , I zoomed into the corner and saw excellent pinpoint stars. I am very satisfied with this flattener.