Hi Mike,
Thanks for the comments. I use Registax (5 or 6 depending what I want to achieve) and Photoshop. I have found that the RGB alignment estimate provided by Registax is better than I can do by my own estimation in Photoshop, and have been using that for quite a while now. It probably doesn't help that I shoot at things so low in the sky either.
Cheers,
Tom
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