List of products by brand Tecnosky

Tecnosky AP 72/432 ED FPL53 Apochromatic refractor

Tecnosky AP LUX 60/360 ED OTA Apochromatic refractor

The flattener serves as a corrective lens, evening out the field which may be slightly curved by the primary optics. This curvature often results in stars appearing less sharp at the edge of the field of view.