[ kel-ner ]
/ ˈkɛl nər /
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. 2020