Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun The lens or lens group closest to the eye in an optical instrument; an ocular.

from The Century Dictionary.

  • noun In entomology, the eye-covering in the pupæ of lepidopterous insects.
  • noun An eyepiece with right-angled reflection-prism attached to the eye-lens, so that the observer looks in at the side, perpendicularly to the axis of the instrument.
  • noun In an optical instrument, the lens or combination of lenses to which the eye is applied.

from the GNU version of the Collaborative International Dictionary of English.

  • noun (Opt.) The lens, or combination of lenses, at the eye end of a microscope, telescope or other optical instrument, through which the image formed by the mirror or object glass is viewed.
  • noun See under Collimate.
  • noun an eyepiece consisting of two plano-convex lenses with their curved surfaces turned toward the object glass, and separated from each other by about half the sum of their focal distances, the image viewed by the eye being formed between the two lenses. it was devised by Huyghens, who applied it to the telescope. Campani applied it to the microscope, whence it is sometimes called Campani's eyepiece.
  • noun an eyepiece consisting of two plano-convex lenses placed with their curved surfaces toward each other, and separated by a distance somewhat less than the focal distance of the one nearest eye, the image of the object viewed being beyond both lenses; -- called also, from the name of the inventor, Ramsden's eyepiece.
  • noun an eyepiece used in telescopes for viewing terrestrial objects, consisting of three, or usually four, lenses, so arranged as to present the image of the object viewed in an erect position.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun The lens (or combination of lenses) at the eye end of a microscope or telescope by which the image is viewed.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun combination of lenses at the viewing end of optical instruments

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

eye +‎ piece

Examples

  • Bent to the eyepiece was an old woman with long, black hair, wet as a well-used mop.

    Vermilion Drift

  • Similarly, on completing the setting out of a curve, and arriving at the end of the chord, the remote end being seen by reflection, the direction observed along the axis of the eyepiece is the new tangent.

    Scientific American Supplement, No. 832, December 12, 1891

  • Like that's not good enough, the costs for producing the eyepiece is a mere $1-2 for production in small quantities, while being able to take down the costs to a few cents on a large scale.

    Softpedia - Windows - All

  • The eyepiece is a lens I had lying around, which has a focal length of about 30mm.

    Museum Blogs

  • The drawtube holding the eyepiece is a cardboard tube, which was left over from a roll of 'Glad-wrap', also covered with the same sticky-backed material as used on the main tube.

    Museum Blogs

  • On the left side of the eyepiece is a button marked RAW/JPEG for one-touch JPEG or Raw shooting.

    ePHOTOzine News Feed

  • The type where you look through an eyepiece while turning a knob until an object comes into focus (usually a tree I use as a distance marker) then looking at the wheel with yardage markings on it.

    New Weekly Contest: Best Hunting Story Wins a Leatherman

  • Nikon D200, Kowa 883 telescope with TSN-PZ camera eyepiece 1/640s f/8.0 at 1000.0mm iso400 Question: This North American migrant is challenging to identify, but there is one obvious field mark visible in this image.

    Mystery bird: eastern willet, Tringa s. semipalmata

  • I'd considered Samco as a resource, but any Mauser action I obtain from them will have to be drilled and tapped for scope mounts, and the bolt handles on a number of them will have to reshaped to clear a scope's eyepiece.

    I'm looking for a long action to build a rifle on. Any suggestions?

  • The type where you look through an eyepiece while turning a knob until an object comes into focus (usually a tree I use as a distance marker) then looking at the wheel with yardage markings on it.

    New Weekly Contest: Best Hunting Story Wins a Leatherman

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