Orion Field Flattener for Short RefractorsEliminates field curvature in short, optically fast refractor telescopes, for sharper stars Designed for use with 400mm to 660mm focal length refractors with f 5 to f 7. 5 focal ratios Now includes interchangeable male M42 and M48 "wide" thread on camera adapters (T ring for your camera sold separately) Preserves focal length attributes of the attached refractor telescope while flattening the field of view Compatible with 2" focusers and requires 55mm
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