Definition of Kellner in English:

Kellner

noun

  • 1Attributive Designating a compound eyepiece used especially for telescopes, consisting of a planoconvex field lens and an eye lens that is an achromatic doublet.

  • 2A Kellner eyepiece.

Origin

Mid 19th century; earliest use found in Proceedings of the Royal Society of London. From the name of Karl Kellner, German optical instrument maker, who introduced the eyepiece in 1849.

Pronunciation

Kellner

/ˈkɛlnə/