Hi, Surely the simple way to see if this behaviour is actually occurring is to set your shutter speed to something very long (eg 1/2 second) and fire with the flash in FP mode. If it is automatically switching to normal sync flash mode then the flash will pop as normal. If it is staying (erroneously) in FP mode, then the flash will burn for a half second. I doubt this is the case very much and have read notes from Chuck Westfall that indicate FP flash is automatically turned off when shutter speed is slower than X-sync.
I would hypothesize that you have too much ambient light in your setup to make flash light the dominant light source. You should try this: shoot one frame of your fast moving subject at each of 1/160, 1/200, 1/250, and 1/320. Assuming flash X-sync is 1/250 then you should see essentially the same thing at the first 3 shutter speeds, and a lot more blurring at 1/320. Do this in the darkest room you can with a narrow aperture and low ISO to eliminate ambient light as a factor in your exposure. Regards David * **** ******* *********************************************************** * For list instructions, including unsubscribe, see: * http://www.a1.nl/phomepag/markerink/eos_list.htm ***********************************************************
