When shooting the barrel racing, I tend to flip back and forward between a couple of different exposures as each rider runs the course. For the shots rounding the barrels (like yesterday’s), I stick a wide open lens to give me a fast shutter speed and to freeze the action. As they round the last barrel and start the race for home, though, I stop down to f/16 or so to give me a longer shutter speed (1/20 or lower usually) so that I can blur the horse as it gallops by. If I shoot on continuous high, I may be lucky enough to get a frame where the rider’s head and perhaps the horse’s head is somewhat sharp but everything else is blurred.