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aberration
n. (in optics) a defect in the image formed by an optical device (e.g. a lens). In chromatic aberration the image has coloured fringes as a result of the different extent to which light of different ...
lens
A curved, ground, and polished piece of glass, moulded plastic, or other transparent material used for the refraction of light. A converging lens is one that brings the rays of a parallel beam of ...
orthoscopic eyepiece
A design of eyepiece that usually consists of a cemented triplet field lens and a planoconvex eye lens. This combination provides good correction for chromatic aberration, spherical aberration, coma ...
Schmidt camera
A wide-field telescopic camera first made in 1930 by the Estonian optician Bernhard Voldemar Schmidt (1879–1935); also called a Schmidt telescope or simply a Schmidt. It uses a spheroidal primary ...
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