Quote:
Originally Posted by gregbradley
Also you need to have sufficient time gap between the subs to allow movement for the stacking algorithim to reject the stars as outliers.
As I recall median will do that but the time gap has to be long enough. Too close together and it won't reject the stars.
Greg.
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Yes, I had read that the separation is important. I've taken a continuous stream of images but in stacking tried excluding 2 out of every 3 images such that stars are not overlapping. This hasn't made a significant improvement over stacking all with median and sigma clipping.
This gets me wondering if the root of my problem is the NABG camera and/or my optics. If the light were to disperse more than otherwise might for each star due to either factor, then greater separation would be required. Having sufficient separation to keep the stars apart but not necessarily the full extent of their halo would logically leave halo's like I have. Hmm.