I recently attended the "Knoxville Nationals" which is the Superbowl of dirt Sprint Car auto racing. I noted several photographers on the infield that were taking pictures of the cars as they came into and slid through the corners. They appeared to be using DSLR's with a big bracket mounted flash of some type. The flash had a large reflector on it, probably at least 12" in diameter. Does anyone know what type of flash units that these guys are using? There were probably at least a dozen photographers with them at different points around the track. Thanks.
