field lens

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

Origin of field lens

First recorded in 1830–40

Words Nearby field lens Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

How to use field lens in a sentence

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

    Pleasures of the telescope | Garrett Serviss
  • The object looked at requires to be a short distance in front of the field-lens.