Shashin
Well-known member
If the scan is from the top to the bottom of the frame, then the relative velocity of the camera pan to the girder changes from the top, to the middle where it is "even, to the bottom where it is opposite from the top. Think of the camera moving one way at the top of the frame, and the opposite way at the bottom. I suspect Mark was in a car (?) and this was a grab shot. But maybe Mark can chime in here. So even though the exposure was 1/8000 sec., the time to scan is longer, just like a focal plane shutter, which is why there is spatial distortion, but a sharp image.That's precisely the linear distortion I was thinking of. But curvature of otherwise straight object happens with, e.g., horse lower limb rotation. Still can't see how a curved girder appears...
--Matt
Either that, or someone should call the city engineers as there is a bridge just about to collapse.