Orion Field Flattener for Short Refractors

  • Sale
  • Regular price $139.99
  • Orion Field Flattener for Short Refractors

    • Sale
    • Regular price $139.99
    • ITEM #



    Orion Field Flattener for Short Refractors

    Orion Field Flattener for Short Refractors

    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 400mm to 650mm 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, 38mm clear aperture optics and a glare-reducing threaded interior ensure maximum image contrast. Backfocus of 55mm 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 oz.

    Orion Field Flattener for Short Refractors Features

    • Eliminate field curvature in short, optically fast refractor telescopes with this handy 38mm clear-aperture, fully multi-coated field flattener
    • Designed for use with 400mm to 650mm 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 55mm of refractor telescope backfocus, weighs 7.5 oz.
    Orion Product Number: 8893

    Additional Information

    Accessory TypeFlattener
    WarrantyOrion Limited Warranty

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    Questions & Answers

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    • hi there  this flatter but the orion short tube 80mm extender ring need to focus?

      This flattener has a 2" diameter barrel, so it will not fit the 1.25" focuser of the short tube 80mm Orion refractor.

    • About "LRGBHa Filters". Is it a product by what maker?

      The filters that SBIG includes with their STT and STF camera packages are manufactured by Baader.

    • hi! this will work on a equinox 66?

      Unfortunately not. The Equinox 66 has a 1.6" focuser with an SCT thread on the back, while this reducer has a 2" nosepiece that when unscrewed has an M48 thread. If you can find a very short SCT female to M48 male adapter it might reach focus, but addin

    • I have an AT72ED will this work on it? thank you Mike

      Hello, This would be a great match for your scope. Tony

    • I am using an Atik Infinity camera with a 1.25" nosepiece, and a Zenithstar refractor with a 2" focuser. Will this flattener fit my setup, or do I need to buy adapters?

      Hello, You will need to use adapters here. The back focus requirement is 55mm and the camera has 13mm of them. I recommend using 40mm of M42 extension tubes. You can thread the extension tubes direct to the Infinity from the flattener or you can use the 1

    • Will it work with a lunt 80mm f/7 ed doublet?

      Yes, this flattener will work fine with the 80mm f/7 doublet.

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