Exercise: Shutter Speeds
With a camera mounted on a tripod, photograph movement at a fixed focus point and different shutter speeds (fast to slow). Find the image where the slowest shutter speed still freezes motion.
Apparently frame 13. is the slowest shutter speed where movement is sharply frozen.
This exercise has shown very clearly that movement can be expressed many ways; from very blurred to only just blurred. Also, whilst focused on the same point the shutter speed needs to be quite fast to sharply define no movement at all.