From the PopPhoto Flash Archives

APRIL 30 2007Tip of the Day: Keep MovingThe technique of panning adds drama to images of moving subjects, such as racehorses and Indy cars. It’s easy, but gorgeous results require practice. Set a shutter speed that’s not fast enough to stop the motion. Keep the subject in one spot in the viewfinder and follow the subject’s movement the same way would if you were using a camcorder. The correct result is a more-or-less motionless subject surrounded by a streaked background.—Jon Sienkiewicz

The technique of panning adds drama to images of moving subjects, such as racehorses and Indy cars. It's easy, but gorgeous results require practice. Set a shutter speed that's not fast enough to stop the motion. Keep the subject in one spot in the viewfinder and follow the subject's movement the same way would if you were using a camcorder. The correct result is a more-or-less motionless subject surrounded by a streaked background.
—Jon Sienkiewicz