Collimators represents the device from stand to adjust the optics or part of plane optical instrument (goniometer, spectrograph, etc.), emitting parallel light beam, which measured parameters of the optical element or is adjusted and checked other optical apparatus. In General, it's focusing system. The device serves as a center of hindsight or hunting weapon optics. Mounted on top of the barrel or in, depending on the type of collimator. Guidance laser is with great accuracy and thus very precisely adjusts the optics or hindsight.
