Quote:
Originally Posted by skysurfer
Or if you have Photoshop, you can load all frames in Adobe Raw and 'fishing' them by 'Filter => Wide angle ...' to make fisheye like images of the rectilinear images which indeed distort strongly in the corners with such a wide angle.
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I don't think the problem is fish-eye distortion here - if there is one, all frames will be distorted in the same way, and if tracking was correct, stacking should not be the problem like we see here.
But, due to coma the star images in the corners are not round, DSS have trouble calculating the centres for tose stars- and the registering and resulting stack can't be accurate.