Quote:
Originally Posted by rogerg
From my experience your hunch is correct. I sometimes have this problem and it's always because my dark frames don't match the light frames accurately enough. In the 'old days' it was because I re-used dark frames from weeks/months ago. Same temperature and all that, just things change slightly over time. That wasn't as bad as what you have, but it's the same deal.
You just need to take some new dark frames at the same temperature as the light frames, asap, and you should be fine. Otherwise it comes down to playing with the processing to minimise the visibility of them (perhaps only partially subtracting the dark frames).
Roger.
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Thanks Roger - cloudy night tonight - will set it up to take a heap, hopefully I'll get a group closer to the right temp!