schmidt-cassegrain

Schmidt-Cassegrain

The Schmidt-Cassegrain, invented by Bernhard Schmidt, is similar to the Cassegrain. In this system the parabolic primary mirror is replaced by a spherical mirror, which introduces spherical aberration. This is corrected by a Schmidt corrector plate. This type of telescope has some of the advantages of the refractor (long focal length) and some of the advantages of the reflector (low cost for larger apertures).

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