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Kellner eyepiece

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noun Optics.
  1. a Ramsden eyepiece having an achromatic lens, used in binoculars.
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Origin of Kellner eyepiece

after Carl Kellner (1826–55), German opticist and lens maker
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018