An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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Kellner eyepiece
  چشمی ِ کلنر  
cešmi-ye Kellner (#)
Fr.: oculaire de Kellner  

The first achromatic eyepiece consisting of a convex lens and a plano-convex lens. The convex surfaces are turned toward one another.

See also: Named after the inventor Carl Kellner (1826-1855), a German engineer and optician; → eyepiece