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Kellner eyepiece

[kel-ner] /ˈkɛl nər/
noun, Optics.
1.
a Ramsden eyepiece having an achromatic lens, used in binoculars.
Origin
after Carl Kellner (1826-55), German opticist and lens maker
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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