Maksutov-Cassegrain

A catadioptric telescope that uses a thick spherical corrector lens and a spherical primary mirror incorporated in an all-spherical design to capture light and produce an image. The lens is deeply-dished so that it corrects for the spherical aberration of the mirror. Advantages of the design include little need for collimation.

Typically they have a high focal ratio and a small secondary obstruction that result in high contrast and resolution when compared with than other catadioptric designs or the reflecting telescopes the use only mirrors.

Referred to as a Mak.

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