correcting plate

correcting plate

(correcting lens; corrector) The aspherical element placed at the front of a catadioptric telescope to correct the aberration of its spherical primary mirror. In this way a very wide field can be obtained, sensibly free from aberrations, even at focal ratios well below one. See also Maksutov telescope; Schmidt telescope.
Collins Dictionary of Astronomy © Market House Books Ltd, 2006

correcting plate

[kə′rek·tiŋ ‚plāt]
(optics)
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.