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Not a bad effort Robert, still good detail but it's hard capturing something less than your best after your effort of the 18th.
I'm convinced onion rings come from underexposure - with my Saturn I captured on the 22nd, I did one avi with pretty much no gain, so the white meter was around 30. It was very dim on the screen, could hardly see it.
When I processed it, it came out with onion rings all over it. The rest of the capture parameters were the same (collimation, focus, etc), only the gain and gamma were changed - and onion rings resulted.
Seeing may also be a cause as Asi states above, but I reckon that would only show itself if you stacked those bad frames with the good ones. And with the idea being we reject the bad ones, it shouldn't be a cause.
Robert, if you want to send me an avi of one where you got onion rings, the raw frames might show what the cause is.
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