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SHADING. The viewed image should be a full circle. If shading is present, you will not see a fully circular
image. Shading is indicative of a dying photocathode and is caused by a defective vacuum seal of the
image intensier. Shading is very dark and you cannot see an image through it.
WARNING. Conditions, practices, or procedures that must be observed to avoid personal injury or loss
of life.
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