Problem solved. Just want to express my gratitude for your fantastic support, absolutely incredible.
Thanks! You have PM.
You are absolutely right. I confirmed by taking a new dark with the camera in total darkness and now the dark-sub is completely even. I'm so...
I suspect that something has gone wrong on my SBIG STF-8300 M. From one day to the other, the histogram for all subs suddenly started at arount 17...
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