Newcon Optik nvs 22-2xt ユーザーズマニュアル

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Check whether the batteries are installed properly. Check the charge of 
the batteries. Replace if they are weak. Do not mix old batteries with new 
ones. 

Bring the target to the center of the image. By turning the knob 8 (Fig.1) 
achieve the clearest target acquisition on the screen. If NVS 22-2XT is 
used with daytime scope re-focus it. Repeat the focusing of NVS 22-2XT 
and scope if necessary. 
If the image still does not seem to be in focus, clean the lenses. They 
could be foggy or dusty. 

If the objective lens of switched on NVS 22-2XT are exposed to bright 
light it automatically shuts off to protect the image intensifier tube from 
overload. When it happens, turn the unit off, wait for a few seconds and 
turn it on again.  
If the image has been lost at the moment of a shot, check contacts in the 
battery compartment. 

In order to avoid misting of the eyepiece lens at cold use the special 
protective cover. 

These are some 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; they are inherent in the manufacturing process. 
Most of them are seen in the daytime only and become almost invisible 
during the night time.