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Those captures are a very nice series of Jupiter images Alex – well done, you seem to have mastered the various technical difficulties very quickly! Generally, onion rings are the result of under exposure so yes, a longer shutter speed would help minimise them.
Are you using K3CCDTools? I can’t remember if it has a Histogram display – if it has, make it active to get some feedback on what tonal range is being recorded.
Cheers
Dennis
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