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6.5 Focusing
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.
6.6 Manual 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% .