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I'm not sure about this camera but I did notice that several other brands of camera using this CCD include a mechanical shutter. Perhaps the shutter is not closing properly on the first command. This would expose the CCD to light during a dark. The second command might complete the closure and all looks good. I had a bit of the same problem a while back with my Moravian G2-8300. The shutter was binding on a wire that came unglued. I saw the issue in lights. Sometimes it worked OK, sometimes not.
Peter
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