An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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orthoscopic eyepiece
  چشمیِ اردابینی  
cešmi-ye ardâbini
Fr.: oculaire orthoscopique  

A telescopic eyepiece that produces a wide field of view (between 40° and 50°). The eyepiece consists of a single element lens that is normally plano-convex, and a cemented triplet that is usually symmetrical.

See also: → orthoscopic; → eyepiece.