Definition of field lens in English:

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field lens

noun

In a multiple lens optical system, the lens farthest from the eye.
Example sentences
  • A converging field lens will shorten the eye-relief (the distance from the eyelens to the exit pupil) of a telescope.
  • It also features mechanical interference in the three-element field lens.
  • But, unlike the standard geologist's field lens, this one has a camera.
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