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Asi, now that's onion rings! Great test, and definitely proves the theory of underexposure. I think I deleted an image of Saturn of mine from the other week where it was very underexposed, and had obvious onion rings too.
Robert, I just want to check that you're not confusing onion rings with the "ring" that you get from oversharpening, like your far left image on your recent (great) jupiter shots.
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