Orion Field Flattener for Short Refractors Astrozap so they are very versatile

so they are very versatile

StarSense identifies the stars in the images

Item Number EPWP8230–01 Focal Length 30mm Length 131mm Width 82mm Weight 35

38 galaxy groups from the Abell and Hickson catalogs

Orion Field Flattener for Short Refractors Astrozap so they are very versatileEliminates 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