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Robert,
The default prefilter for Registax/Optimize is off. When checked the first filter that pops up is 'flat' - same as lowpass. I found all the lowpass filters result in essentially the same result.
Underexposure certainly does limit the number of bits that will cover the limb shadows of Jupiter, perhaps gamma adjustment would correct that. With my NexImage camera I rarely get onion rings even when I expose at half saturation (128 bits) with ET 1/10s Brt 50% Sat 100% Gamma 0 (1.0) Gain 40% at F25 or so. It is with my Firewire camera (Unibrain 501c) that I get onion rings even with pels at 220.
Glenn Jolly
Celestron C11
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