This timing show the open en close results in function of the timing. The shutter speed is set on 1/500 sec but in real time this take near 4.75 msec between full close and only between 5.0 and 6.0 msec the shutter is full open. The best timing for the flash in this case is after 5 msec, because the shutter stay full open for at least 1 msec. Most of the time the flashtime is short for this application, near 200 usec or less. The used lens is the AF200/4D micro at 1:4 ratio.