Newcon Optik NVS 4 - Manual (Page 16)

13
Condensation accumulates on the parts.
It is O.K. to use the unit in cold. However, when the unit is
brought from the cold into a warm environment, it has to
warm up for up to 2 hours (not minutes!). Only then it is
allowed to turn it ON again.
Visibility decreases and / or disappears.
Bright light sources (moon, projectors or headlights)
may cause visibility to degrade or even completely
disappear. Move the device away from the light source
immediately. The image should be restored in within 2
minutes. Poor atmospheric conditions such as fog,
haze, or extremely dark environments will decrease the
visibility distance of the unit.
Reticle is absent or weak.
Check the batteries.