Math Artifacts

With today's commodity technology, we can easily achieve the angular resolution of the U-2 spy plane from the middle of last century! A modern press photographer at the red carpet is shooting with a $50$ megapixel DSLR camera. If she is shooting with a shutter speed of $\frac{1}{250}$ of a second and the lighting is optimal, about how far can any part of the subject's body move in 1 second before it creates a blur?