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Astronomy & Space vocabulary · Telescopes & Observation

Eyepiece

Meaning in astronomy & space, with examples

/ˈaɪpiːs/nounCommon term

In astronomy & space, eyepiece means: The small lens at the end of a telescope that you look through. Changing the eyepiece changes the magnification and the field of view.

In Turkish: göz merceği, oküler

How it is used

Amateur astronomers own sets of eyepieces with different focal lengths, such as 25 mm and 10 mm. Magnification equals the telescope's focal length divided by the eyepiece's focal length.

Example sentences

  1. Start with a low-power eyepiece to find the object, then switch to a stronger one.

  2. A 10 mm eyepiece on a telescope with a 1,000 mm focal length gives 100 times magnification.

Common collocations

  • low-power eyepiece
  • high-power eyepiece
  • change the eyepiece
  • wide-field eyepiece
  • telescopeAn instrument that collects light or other radiation from distant objects with lenses, mirrors or antennas, so that faint and far-away things can be seen and studied.
  • apertureThe diameter of a telescope's main lens or mirror. A larger aperture collects more light, so fainter objects and finer details can be seen.
  • observatoryA building or site with telescopes and instruments for observing the sky. Many large observatories are built on high, dry mountains far from city lights.
  • astronomerA scientist who studies stars, planets, galaxies and other objects in space, usually by observing them and analysing the data.

More terms: Telescopes & Observation

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