field lens


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field lens

See eyepiece.
Collins Dictionary of Astronomy © Market House Books Ltd, 2006

field lens

[′fēld ‚lenz]
(optics)
The lens in a two-lens eyepiece which is farther from the eye.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
The scanning velocity and line interval were set as 6 m/s and 1 [micro]m, respectively, under an assumption that the focal length of field lens was 163 mm.
The SLV Eyepieces also incorporate a 7-element design in 4 groups with fully multicoated glass-to-air surfaces, a scratch-resistant coating on the field lens, and a rare-Earth lanthanum element.
The field lens was hopelessly coated with tar, and he eventually had to discard a prized eyepiece.
Eye relief was tight with the 6-mm eyepiece, but the recessed region around the eye lens's "volcano top" let me to soak in the sharp image without smudging the field lens with errant swipes of my eyelashes.