diopter

Betekenis (Engels)

  1. A unit of measure of the power of a lens or mirror, equal to the reciprocal of its focal length in meters. Myopia is diagnosed and measured in diopters.
  2. The dioptre adjustment mechanism of a pair of binoculars or of a camera viewfinder.
  3. A lens element attached to the front of a photographic lens to shorten the lens's minimum focus distance; also called a "close-up filter".
  4. (obsolete) Any lens system, such as a telescope.
  5. (obsolete) A theodolite or similar surveyor’s angle measuring device.
  6. (obsolete) An alidade.
  7. (obsolete) A surgical speculum.
  8. (obsolete) An instrument for drawing the skull by projections.

Concepten

dioptrie

Synoniemen

cross staff

sight alidade

alidate

dioptry

Etymologie (Engels)

From Latin dioptra, from Ancient Greek διόπτρα (dióptra).

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Engels

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