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.correcting plate
[kə′rek·tiŋ ‚plāt] (optics)