Newcon Optik STARGATE M, Operation 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