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All software relies on webcam driver having exposure control. Most webcam do not have exposure control and as most of the image captured is black the result is the camera automatically increases the exposure to compensate.
I have had no success with exposure on any webcam (even those with a manual exposure control) so instead I use filters to decrese visual exposure for my 12" DOB.
Need to clean your CCD/COMS sensor on the webcam very carefully.
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