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Explore Scientific 2" Field Flattener For ED APOs

SKU : ES-FFEDAPO-01

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This field flattener is an excellent choice for cameras with cropped sensors -- APS-C and smaller. It will not provide a flat field when used with full-frame cameras.

  • 2-Inch Accessory
  • Use with ED Refractors 
  • Corrects Natural Field Curvatures
  • Edge-to-Edge Crisp, Sharp Images 
  • 55 mm Back Focus
  • Male thread size is M42

 

Product Details

  • The 2-Inch Field Flattener for ED APO Refractors by Explore Scientific: 

    This field flattener is an excellent choice for cameras with cropped sensors -- APS-C and smaller. It will not provide a flat field when used with full-frame cameras.

    One of the truths of refractor optical design is a curved focal plane. While the center of the view remains crisp and clear the edges of that view become increasingly out of focus. Even the most precision ground optics will exhibit curvature but while this is typically not an issue for the observing astronomer (whose target is typically in the center of the field of view) blurry edges can be a huge issue for the astrophotographer. With the addition of this field flattener, aberrations that are caused by this curvature are corrected! Your images will be tack sharp from edge to edge. Created using fully multi-coated optical glass to maintain optical integrity, the Explore Scientific will slide securely into the 2-inch opening of your telescope.

    • The Explore Scientific 2-Inch field flattener was designed to be compatible with any ED refractor that will accept 2-inch accessories.
    • Corrects the natural field curvature exhibited by refractor optical designs.
    • Crisp, sharp images from edge to edge - a must have accessory for the astrophotographer.
    • 55 mm back focus 
    • Male thread size is M42

    OPT Product Number: ES-FFEDAPO-01

  • specifications

    Barrel Size2"
    Free ShippingYes
    Thread SizeM42
    WarrantyLifetime Warranty
  • included items

    This field flattener is an excellent choice for cameras with cropped sensors -- APS-C and smaller. It will not provide a flat field when used with full-frame cameras.

    • 2-Inch Accessory
    • Use with ED Refractors 
    • Corrects Natural Field Curvatures
    • Edge-to-Edge Crisp, Sharp Images 
    • 55 mm Back Focus
    • Male thread size is M42

     

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    RH
    10/14/2019
    Richard H.
    United States United States
    Did not flatten as advertised

    Per product description this lens does not flatten the FOV on my 127mm ES APO. The outside corners still had elongated stars with round stars in the middle 2/3 of the image. Camera used is the ASI 1600mm Pro cooled mono camera. Also noted vignetting on corners of the processed image. I would think E.S. would do a better job of testing their lenses.Don't buy this for 127mm and larger APO's.