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You are correct Mike: If you stack the bad with the good. In my mind, registax WILL stack the bad with the good if one is not extremely careful.
I just tried an experiment on my last Saturn AVI...which had the onion ring effect, which was my main reason for using less severe waveletts that what I would normally do.
In registax I used the 128 size alignment box & put it directly on the very limb of the globe of a good frame, I then used optimization @ 90% which gave me 523 frames to stack. No sign of any onion rings.
As to the cause...I wish I knew! I could just about guarantee I was not under exposed. I used 30% gain & 50% gamma with brightness probably 30% An interesting problem!
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