Introduction to the use of binoculars

Binoculars are observation instruments composed of two telescopes with the same performance and meet the observation requirements of people's eyes. It is a basic observation instrument for military use, used to observe terrain, reconnaissance of enemy situations, and roughly measure target distance, direction angle, height angle, and missile impact point deviation. Non-military uses are also widespread. The two lens tubes are generally connected by a hinge axis as a reference. The lens tube rotates around the hinge axis to change the distance between the two eyepieces to adapt to the distance between the pupil of the observer's eyes. The eyepiece can be adjusted for "photometric power" and is equipped with a filter attachment.