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4. Fixed-Pattern Noise.
This is usually a cosmetic blemish characterized by a faint hex-
agonal (honeycomb) pattern throughout the viewing area that
most often occurs at high light levels or when viewing very bright
lights (See Figure 5-4). This pattern can be seen in every image
intensifier if the light level is high enough. This condition is
acceptable as long as the pattern does not interfere with
viewing the image and interfere with the ability to perform
the mission.
Figure 5-4
Fixed Pattern Noise