field lens


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field lens

the lower of the two planoconvex lenses of Huygens ocular.
Farlex Partner Medical Dictionary © Farlex 2012
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As the photograph at right shows, the field stop is a metal ring normally positioned ahead of the eyepiece's field lens, though in some complex designs it can be located between lens groups.
In 1870 Airy and his assistant William Simms suggested a modified form of the Ramsden eyepiece in which the eye lens could be given a variable tilt relative to the fixed field lens to correct for atmospheric dispersion.
The field lens of the eyepiece was installed backward.
Now slide in the field lens with the positive element facing the eye lens.
An eyepiece's field lens will probably stay clean by itself.