Quote:
Originally Posted by peeb61
Thanks Clive, I have tried stacking with Darks and Bias frames and when I did stack them the image came out way too dark almost clipped down to the black end of the histogram and this couldn't be processed out so I don't know where I am going wrong? 
DSLR.
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It's quite possibly a result of your camera settings
You need to have your gain and offset correctly done. It's quite possible your offset is too low . Other things to check is that the settings for all your calibration files as far as offset and gain goes is the same.
As a security measure you should use the same program for collection of all your frames during shooting, offset and gain may vary from program to program
Just a suggestion, if you are confident about all your settings you might have to look elsewhere.