Kellner eyepiece

[kel-ner]

noun Optics.

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

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. 2019