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field lens

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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.

Origin of field lens

First recorded in 1830–40
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for field lens

Historical Examples

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

    The New Gresham Encyclopedia

    Various