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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.
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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 of field lens

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

    The New Gresham Encyclopedia

    Various