Aviator's night vision imaging system non-rotational objective lens

摘要

A device for adjusting the position of a lens along an optical axis of the lens. The device has a lens housing for carrying the lens and a first knob positioned to rotate about the lens housing. A second knob is cooperatively threaded to the first knob such that rotation of the first knob relative to the second knob causes axial movement of the lens housing along the optical axis. A coupler couples the lens housing to the second knob to prevent the lens housing from rotating relative to the second knob when the first knob is rotated.