afocal lens

afocal lens

[′ā·fō·kəl ′lenz]
(optics)
A lens of zero convergent power, whose focal points are infinitely distant.
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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.
But the afocal lens of the new FLIR doesn't project forward as far as the one on the old FLIR, so you may need to shade the gap between the collimator and the FLIR if there's too much light.