Kellner eyepiece

[ kel-ner ]

nounOptics.
  1. a Ramsden eyepiece having an achromatic lens, used in binoculars.

Origin of Kellner eyepiece

1
After Carl Kellner (1826–55), German opticist and lens maker

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2024