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Rob
There is pretty severe diagonal drift (eggy stars), and, it seems some really woofy extremes which maybe due to wind. The odd thing is, the error is opposite in the 2 images, did you rotate one?. If the subs were more than 5 mins , differention flexure maybe a problem, that depends on your FL, which you didnt mention. Its going to be hard to tell the need for a flattener without good guiding. As far as I can tell, most dont need one with a DSLR on an ED80, I cant tell from these 2 pics. If you aligned the imaging and guide cams directly up/down, it would be easier to tell what the probelm was (assuming they arent now).
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