eyepiece


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Related to eyepiece: Eyepiece Camera, mechanical stage

eyepiece

 [i´pēs]
the lens or system of lenses of a microscope (or telescope) nearest the user's eye, serving to further magnify the image produced by the objective. Called also ocular.

eye·piece

(ī'pēs),
The compound lens at the end of the microscope tube nearest the eye; it magnifies the image made by the objective lens.

eyepiece

(ī′pēs′)
n.
The lens or lens group closest to the eye in an optical instrument; an ocular. Also called eyeglass.

eye·piece

(ī'pēs)
The compound lens at the end of the microscope tube nearest the eye; it magnifies the image made by the objective.

eyepiece

The lens or combination of lenses in an optical instrument (microscope, telescope, etc.) through which the observer views the image formed by the objective. The most common eyepieces are composed of two single lenses or two doublets: the lens or doublet nearer the eye is called the eye lens and the one nearer the objective is called the field lens. The role of the eyepiece is to magnify the image and to reduce the aberrations of the image formed by the objective. Syn. eye lens; eyeglass; ocular.
Huygens' eyepiece Negative eyepiece used commonly in microscopes. It consists of two planoconvex lenses mounted with their plane surfaces facing the eye. In the most common type the eye lens has a focal length half that of the field lens and the separation is equal to half the sum of the two focal lengths.
negative eyepiece Eyepiece made up of two lenses, in which the first principal focus of the eyepiece lies between the two lenses, such as in a Huygens' eyepiece.
orthoscopic eyepiece An eyepiece corrected for distortion, and which provides a wide field of view and high magnification. It consists of a triplet field lens and a single eye lens. It is used in high-power telescopes and range finders. See triplet.
positive eyepiece Eyepiece made up of two lenses in which the first principal focus of the eyepiece lies in front of the field lens, such as in a Ramsden eyepiece.
Ramsden eyepiece Positive eyepiece consisting of two planoconvex lenses mounted with their convex side facing each other and having equal focal lengths. The lenses are usually separated by two-thirds the focal length of either.
References in periodicals archive ?
Caption: This early Weaver has an eyepiece not much bigger than its 3/4" steel tube.
And I especially like the angled eyepiece. I grew up using a spotting scope with a straight eyepiece and encountered all kinds of awkward viewing situations.
According to Anderson, 'our proprietary holographic photopolymers have been developed and refined for over two decades, and along with our ability to design and develop complex holographic recording systems, we have a unique insight into how to use holography to create the most elusive and difficult component of an AR headset: a thin, transparent eyepiece that provides good display performance at a reasonable cost.'
Tool #2: A good eyepiece. The second most useful tool I've used with young children is an eyepiece with a wide apparent field of view (AFOV) and the best eye relief I can afford.
See my short paper 'Radioactive lenses as eyepieces', in JBAA vol.
Experiencing Saturn through the eyepiece. You can't believe it's real.
Less light is necessary to magnify and transmit the image to the eyepiece. Lower light allows surveillants to position themselves closer to subjects, hence the logic behind a lower magnification power.
When in doubt, start with a 10x eyepiece because of its three-quarter inch eye relief--the distance between the observer's eyeball and the eyepiece.
A 20-power 20x) eyepiece, for example, magnifies the image 20 times.
For viewing downrange targets from a bench or shooting position, the competitor often prefers a spotting scope whose eyepiece is angled up, say at 45 degrees, from the line of the scope tube itself.
And not just research time, but actual observing time with an eyepiece.
Equipped with an adjustable, angled eyepiece with 20X to 60X magnification, this spotting scope offers maximum flexibility.