Thanks Adam, That took care of the problem. I figured it was something simple that I was overlooking. I have a CMOS camera that does have amp glow that is the main reason why I am using flat darks. I will look at increasing the time for the flat…
Here is a screen shot of a single comet only frame. For some reason it did not attach earlier. I will try the residual masking technique again. I may have messed up somewhere along the way.
Mike