orthoscopic eyepiece


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orthoscopic eyepiece

(or-thŏ-skop -ik) See eyepiece.
Collins Dictionary of Astronomy © Market House Books Ltd, 2006

orthoscopic eyepiece

[¦ȯr·thə¦skäp·ik ′ī‚pēs]
(optics)
An eyepiece that consists of a single lens, made up of three cemented elements, to which a planoconvex lens is added; designed to minimize distortion and spherical aberration.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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The 25-mm orthoscopic eyepiece yielding 41x provided his first moderately wide-field viewing.
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That was easy to do, given the 192-inch focal length of the scope and Jimi's favored orthoscopic eyepieces, which minimize the number of air-to-glass surfaces that can cause light scatter from a bright object just outside the field.
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Widely available even today, orthoscopic eyepieces offer excellent sharpness, color correction, and contrast combined with a 40[degrees] to 45[degrees] apparent field of view.
Eyepieces for planetary observing: Jupiter and Saturn are easy to observe now--but what eyepiece type will give the best views?

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