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Hi Asi,
Here is a theory of mine on the onion rings. Capture size must be smaller when seeing is causing Jupiter to pulsate like a heart beat.
Last nights image done with your 9.25 was acceptable= no onion rings although the seeing wasn't sharp. Used 2x barlow only.
The images I captured with my 14 with 2x barlow = larger image scale were bad for onion rings. If it clears up tonight will try just prime focus for seeing of 5/10 or less.
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