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Condensation accumulates on the parts
In order to avoid misting of the eyepiece lens at cold
temperature use a special protective cover.
Black dots on the screen
These are the blemishes in the image intensifier, which do
not affect the performance or reliability of a night vision
device. Blemishes may vary in size and number; those are
inherent in the manufacturing process. Most of them are
seen in the daytime only and become almost invisible
during the night time.
Bright spots on the screen
The image may contain some bright spots caused by
gradual relief of static electricity from the cathode. This
feature may appear immediately after assembling of the
device or attaching/detaching of the objective lens, and it
always disappears within 5-14 days of usage or storage.
