Hi Alex,
It may be rotation if you stacked that many frames, lately I have only been capturing 30 secs max at 10fps to give 300 frames and then setting Registax to 70% to weed out the crap. This seems to give me more details because I am not sloshing all the details together and smudging it in the process.
Other than that, not sure, it may have been the wind or the seeing based on that 6.5m focal length?
Chris
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