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I'm having a challenge stacking wide-angle shots (Fujifilm X-Pro1 with a Samyang 12mm f/2.0 lens) using Deep Sky Stacker. When I use large numbers of exposures, the final image is blurred, even minorly out from the centre, and the extremeties of the shots even have doubled stars. I've tried fumbling around myself, to no avail, so I appeal to you, the experts...
I have two nice series of 45x15" and 45x10" shots taken at Hargraves Lookout. Each individual image is relatively crisp all the way to the edges (just a single capture - see
https://www.flickr.com/photos/921677...34507/sizes/o/ )
If I stack just 4 of them, I get a decent result (stack of 4, processed - see
https://www.flickr.com/photos/921677...667847/sizes/o )
However, when I stack all 40+ of them in DSS, I get a muddy, smudged, doubled result in the corners, and I can't seem to change it... (cropped processed stack of 40+ - see the bottom portions of
https://www.flickr.com/photos/921677...396737/sizes/o
Uncropped, unedited stack, see
https://www.flickr.com/photos/921677...007052/sizes/o )
To me, it seems that the fish-eye effect of stars at the outer edges that is reduced as the stars move in to the centre/out of centre of the frame is not being corrected by software, leading it to the apparent motion of the stars smudging them, and eventually DSS realises/calculates that it is a "new" star, hence the doubling. While not all were immediately taken one after the other, all shots were taken with only a short delay between each capture - 5-10 seconds gap would be accurate, and only a handful longer than that between captures.
Can anyone make suggestions for the settings I should use? Or if it is a limitation of the software, what alternatives there are to it?