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field lens

noun, Optics.
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 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Examples from the Web for field lens
Historical Examples
  • 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

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