The flattener is a lens that evens out the field, as this is slightly curved by the primary optics. This curvature causes stars that are imaged at the edge of the field of view to be less sharp. The flattener, also called a field flattener, corrects this effect. Astrophotographers can then enjoy images where the stars remain sharp right out to the edge of the exposure. The flattener is installed between the telescope and the camera.
This field flattener is designed for iOptron Apochromatic refractor AP 108/648 ED Versa OTA. But it is also compatible with other refractors with aperture ratios of f/5 to f/7.
