This part of registax has always puzzled me actually. So for the last couple of months I've been doing a lot of experimenting of my own in this area.
I have'nt come to any definite conclusions as yet though. But I will say I have better success If I use 80% (default) onlyif the seeing conditions were fairly average. If the seeing was good, I go with 50%. It seems to me how many frames you have to stack initially in the AVI has a lot to do with what % to give it as well.
If I have a fairly short AVI (800 frames or less) I will nominate 100% which bypasses optimization totally then go to the stacking area & hand pick the good frames & then stack. Not many people have time for this though!
As I said, I'm still experimenting in this area so no definite conclusions yet.
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