I was photographing snow in during very early one morning using a LED flashlight to illuminate the snow. When I reviewed the images several had this pattern. The exposure was 30 seconds and the only explanation I can think of is the light source. Canon advertises that there new 7D will have pulse detection to trigger the shutter during the brightest light. It probably won't be effective with a 30 second exposure but at least I know the problem they are trying to correct.
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