Newcon Optik 150 User Manual

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6.5.  Visibility decreases and / or disappears. 
Bright light sources (moon, projectors or headlights) may 
result in visibility degradation or even complete 
disappearance. If this happens move the scope 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 as 
well. 
6.6.  Visible spots 
Image quality of the object, which is being observed when an 
image intensifier is functioning, depends mainly on operating 
characteristics of this image intensifier.  
Due to this fact black spots, which are inherent in the image 
intensifier, may be seen in the field of view of a viewing 
device. Field of view is shown below. 
 
Central zone
Boundary zone
Periphery zone
 
Acceptable defects, which may be seen in the field of viewing 
device, are given in the table