Procedure for checking correct camera exposure
Don’t forget: the camera is looking at the area around the target dot – not just at the dot itself.
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Double check that you have suitably subdued lighting.
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Double check that there is no light, or reflected light, anywhere in the path followed by the target. Stray light could be from a window, wall light, spot light, ceiling light, mirror, reflection from a picture etc.
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Double check simulator and shooter distances.
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Use Automatic camera exposure to set the initial exposure value.
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Use muzzle alignment or pattern board for tests.
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Never shoot at the limits of the wall. (It would be bad shooting and a waste of ammunition in the real world.)