afocal lens

afocal lens

[′ā·fō·kəl ′lenz]
(optics)
A lens of zero convergent power, whose focal points are infinitely distant.
Mentioned in ?
References in periodicals archive ?
The Javelin CUU needs its specially designed case to protect parts like the hand grips, afocal lens, eyepiece, and battery case.
A significant performance improvement in the Block I CLU is an increase in target identification range through use of a larger afocal lens (12X vs 9X) plus the addition of electronic zoom capability.
At 1X magnification, the Ugo night channel offers a 40 [degrees] FOV - a figure that reduces to 10 [degrees] if magnification is increased to 4X via an afocal lens adapter which can be "fitted in the field by the user.