Cool shots! I like the varying DOF. It looks like it wasa pretty overcast day. Were you using the flash just for fill or did it help you stop action? I'm assuming based on the low ISO you were using it was just to grab some more detail in the biker's facial expressions? I want to start experiementing with off-camera flash both indoors and out. So you were using the on-camera 580's infrared port to trigger the slave?