Fixed focal length lenses from Edmund Optics feature compact, ruggedized design

TECHSPEC Compact ruggedized (CR) Series fixed focal length lenses from Edmund Optics are designed to maintain optical pointing and positioning in harsh environments that involve vibration, shock, and changing temperatures.

from Factory Automation http://www.vision-systems.com/articles/2017/09/fixed-focal-length-lenses-from-edmund-optics-feature-compact-ruggedized-design.html