Crossword clues for eyepiece
eyepiece
Longman Dictionary of Contemporary English
The Collaborative International Dictionary
eyepiece \eye"piece`\ eye-piece \eye"-piece`\, n. (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.
Syn: ocular.
Collimating eyepiece. See under Collimate.
Negative, or Huyghenian, eyepiece, 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.
Positive eyepiece, 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.
terrestrial, or Erecting eyepiece, 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.
Wiktionary
n. The lens (or combination of lenses) at the eye end of a microscope or telescope by which the image is viewed.
WordNet
n. combination of lenses at the viewing end of optical instruments [syn: ocular]
Wikipedia
An eyepiece, or ocular lens, is a type of lens that is attached to a variety of optical devices such as telescopes and microscopes. It is so named because it is usually the lens that is closest to the eye when someone looks through the device. The objective lens or mirror collects light and brings it to focus creating an image. The eyepiece is placed near the focal point of the objective to magnify this image. The amount of magnification depends on the focal length of the eyepiece.
An eyepiece consists of several " lens elements" in a housing, with a "barrel" on one end. The barrel is shaped to fit in a special opening of the instrument to which it is attached. The image can be focused by moving the eyepiece nearer and further from the objective. Most instruments have a focusing mechanism to allow movement of the shaft in which the eyepiece is mounted, without needing to manipulate the eyepiece directly.
The eyepieces of binoculars are usually permanently mounted in the binoculars, causing them to have a pre-determined magnification and field of view. With telescopes and microscopes, however, eyepieces are usually interchangeable. By switching the eyepiece, the user can adjust what is viewed. For instance, eyepieces will often be interchanged to increase or decrease the magnification of a telescope. Eyepieces also offer varying fields of view, and differing degrees of eye relief for the person who looks through them.
Usage examples of "eyepiece".
He also caught sight of a helicopter being rolled out onto the helo deck aft as he pulled his eye away from the eyepiece, snapped down his eyepatch and lowered the periscope.
He took a multiradiation tester from its padded carrying case and held it before the eyepiece that Gulyas had been trying to look through.
He could feel the torn, knurled rim that had held the small lens of the eyepiece.
Perhaps if he were given a microscope, a good compound microscope with a variety of eyepieces and an ample stage, he might take great pleasure in some of the smaller forms, the rhizopods, the rotifera, the parasites of lice themselves .
After a request to actually see stromal cells, in no time the scientist was hunched over the eyepiece of a microscope and projecting fuchsia-colored slides of pulsing cardiac tissue onto an overhead screen.
Daniel Hoveler, who was nothing if not an earnest researcher, raised strained eyes from the eyepiece of his microstage, then got up from his chair to stand beside his workbench.
The masks had two round eyepieces that combined with the long, snoutlike corrugated rubber breathing tube to give the wearers an unhuman appearance.
Harry Talbot finished telling them about the Boogeymen, Sam leaned forward on the high stool to the telescope eyepiece.
Vittoria aligned the scope with one of the canisters, peered into the eyepiece, and calibrated some knobs.
I flick off its endcaps with my thumbnail as I raise it to peer through the eyepiece.
He positioned it over the neck bones of the deformed skeleton, peered through the eyepieces, made a few adjustments, then stepped back.
Harry worked with a series of eyepieces, adjusting the power on the scope and trying to sharpen the focus, until he had pulled in so close to the window that the lens was filled by the narrow slot between the drapes.
By the time I had it to my shoulder the elephants were in among the trucks and all was confusion, my impression blurred by the din of shots and squeals of rage, the camera whirring and everything seen through the eyepiece.
He peered into the eyepiece, across the snowscape to the coordinates Berrier had indicated.
Gunn set the distance on the clinometer and then sighted through the eyepiece, measuring the length of the shadowy object under the water.