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orthoscopic eyepiece

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

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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