Paul,
in my earlier days (heck I am sounding old) of ToUcamming I used to suffer severe Onion Ringing. I always understood this to be another "line" or two on the image.
What Tony is talking about is the sharp edge of the limb, rather than a faded off edge. If I drop the gamma this fades well, but to me when I look visually the edge is hard and sharp, and this is also rendered in my shot.
Are you saying that this "Onion Ring" is when I have a hard sharp edge on the limb? Help an old timer out here.
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