I took my first avi's of Saturn last week using my 12inch and 550D at prime focus with a 2.5x and 5x Powermate stacked on each other. Finally got around to stacking it all in Registax.
Took me a while to convert the .mov file to a readable .avi file that Registax could process. Used 685 frames, so overall very happy for a first attempt.
I think my focus was a little out, however it is a good starting point as far as I'm concerned. Please critique as necessary.
Thanks, Evan