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Yes, it could be slight movement of the frame I guess during the period that I took the shots, and then, I guess misalignment in DSS. I've seen similar things using CombineZM for my macro shots.
As to Nikon, photography is a major hobby of mine (terrestial). Astro imaging with a DSLR is only a minor interest for me, if I'm going to get serious with astro imaging I'll need a permanent mount setup, accurate polar align, better mount, dedicated imaging camera. Nikon's D3 is far better than anything Canon offers at the moment. And truth be told, I'm rather jaded with Canon over a variety of issues, and exceptionally poor customer service that I've received in the past. I won't go into it in detail, since I'll be labelled a "Canon basher" like I have on POTN.
I do NOT believe in giving praise to a bad manufacturer.
Dave
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