Hello,
I'm new to this astrophotography game and I was wondering if anyone had any thoughts on what appear to be bubbles around my stars after stacking in Deep Sky Stacker. I have attached a before frame which is a 1:1 crop of one of the sub exposures. The after frame is of the same section of the picture after stacking. The 'bubbles' are not really noticible in the full frame view (3rd attachment). I'm certain that all the subs are identical (I checked them all....twice) with no focus shift during the exposures. I'm convinced that it is something to do with the stacking process. Is there a setting I am missing or a setting I should uncheck???
Any thoughts would be greatly appreciated.
Thanks
Greg
Canon EOS 1000D
Baader Coma Corrector
10 inch (25cm) F/4 Newtonian Reflector Telescope
NEQ6 PRO Computerised Goto Mount
Orion 80mm ShortTube Guide Scope
Synguider Autoguider
21 X 120 seconds exposures
ISO 400
Images stacked and alligned in Deep Sky Stacker
Final processing in Photoshop Elements 8.0
