field lens

noun

, Optics.

1. the lens in an eyepiece that is farthest from the eye and that deviates rays toward the center of the eye lens.

Word History and Origins

Origin of field lens¹

First recorded in 1830–40

Example Sentences

The equivalent focal length of a negative or Huygens eyepiece is equal to half the focal length of the larger or field lens.

From Project Gutenberg

The object looked at requires to be a short distance in front of the field-lens.

From Project Gutenberg