6.5Focusing
To obtain a sharp image at some other distances adjust the lens focus (3, Fig. 1) leaving the eyepiece setting intact. You should be able to obtain a sharp image for distances from 2-10m to infinity.
If you wear eyeglasses or NBC protective mask, you may like to fold the rubber eyecup.
6.6Manual gain adjustment
NVS 14-3GCS monocular is equipped with the manual gain adjustment handle. The light gain of the Image Intensifier Tube is set to the level, at which it allows viewing in the darkest conditions. While outside illumination increases at dusk, dawn, full moon or in the environment with artificial lights, the tube enters the Automatic Brightness Control (ABC) mode that automatically decreases gain to keep the screen brightness on the same level thus protecting both the tube and the observer’s vision. It leads to situation when the contrast of the image (relation between the brightest and darkest patterns on the screen) becomes lower, and detection/recognition ranges become shorter. In order to prevent deterioration of device performance under higher illumination the user can rotate the manual brightness control knob counter clockwise to restore full functionality. The brightness control can be adjusted in the range of 20-100% .