12/5: Tennis ball being struck

[Undertoad]

From a gallery of high-speed photography, this is what actually happens when a tennis ball is struck: the ball actually compresses to about half its usual size.

To get the image, a flash unit had to be set up with an audio trigger so the photo could be shot via the sound of the racquet hitting the ball. It would seem that setting up the trigger is the key to this sort of high speed photography.