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Thanks for the comments.
The onion rings are only appearing in the Luminance data, which i'm capturing at 30fps (1/30s) with a full histogram (gain at 85%). It appears immediately after wavelets processing in registax. It didn't/doesn't appear on the colour channels from the same session.
I'm really not sure what's causing them. While the seeing was good, the planet did change shape quite a bit and I wonder if it's caused by not enough data around the limb after stacking, due to the shape-shifting.
I already capture with a medium gamma setting (12) with the DMK.
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