eyepiece

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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 ?
I recall spinning eyepieces off scopes and regarding with wonder (but not touching!) their reticles before Leupold used nitrogen to fog-proof tubes and sealed them.
Ken Anderson (co-founder and CEO) claims the HoloMirror technology is the perfect solution for a transparent eyepiece that combines the view of the outside world with a computer display.
For youngsters, one of the most difficult parts of using a telescope is realizing that they need to look through the eyepiece rather than at the eyepiece.
Simon Dawes' letter in the October Journal (120(5), 322) regarding a low power eyepiece recalls a topic discussed before.
Many different objectives are available, but, as with eyepieces, higher power reduces working distance, which frequently dictates microscope requirements and limits the power.
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.
Conventional wisdom has long held that the best planetary eyepieces are those with the smallest number of lens elements and air-glass surfaces that can still provide a well-defined image in the center of the field of view.
To do that you use eyepieces, which are really nothing more than fancy magnifying glasses.
I tested the TGA 75 using both eyepieces. With the 20 to 60x eyepiece the image is bright, FOV is good (31m at 1000m on 20x and 16m at 1000m on 60x), and the resolution is very good from the center of the image all the way to the edges.
When in doubt, start with a 10X eyepiece because of its 3/4-inch eye relief--the distance between the observer's eyeball and the eyepiece.