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Explore Scientific Zero Power Flattener for ED APO
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. A curved focal plane is an inherent feature in most telescope designs and is nothing to note for general stargazers. But, for astrophotographers, the consequences of that same curved plane can ruin hours of patient imaging.The FFEDAPO-01 Zero Power Flattener for ED APO is designed to work with Explore Scientific's Achromatic Doublet Series (DAR), Essential Series, and FCD100 Series telescopes with diameters of 80mm, 102mm, and 127mm. The device is threaded so that a 2-inch filter can be installed.
- Designed for refracting telescopes, Explore Scientific™s Field Flattener can tackle the edge-of-field aberrations caused by this necessary curvature to ensure your long night at the eyepiece will not be in vain.
- This accessory, which now has 55 mm of back focus (+/- 2 mm), offers fully multi-coated optics and slides securely into the 2-inch eyepiece holder.
- Field Flattener Zero Power (for ED80-102-127 Air-Spaced Triplets)
- 2.0-inch OD 55mm back focus