Thanks to a video where the Canon 7D shutter has been recorded at a high speed (10000fps):
Inside a Camera at 10,000fps - The Slow Mo Guys, I felt curious about estimating the camera's rolling shutter speed geometrically:
If 118 pixels on that image correspond to 1/500s of exposure, it takes to each mechanical shutter to run along the entire sensor: 1/500*133/118=
1/444s. That would be the 7D's rolling shutter speed, enough to freeze without distortion moving objects in general real world situations but not that impressive.
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