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Today while I was out making snapshits I changed my mind while taking a picture, and I moved the camera while pressing the shutter.
The result, as expected, had a lot of motion blur and I was ready to delete the pic, but then I noticed a small part of it, off-center, was actually reasonably sharp in focus (see full size, wheel of the bike, had to lower jpeg quality to fit in 5MB).
How does this work? What exactly did I do?