It's peripheral to what you're asking, but if you are trying to freeze motion with a flash unit, this 1/700th of a second isn't gonna cut it for things like bullets through balloons etc. And here's the interesting thing; if you set your flash for less than full output, it accomplishes that by shortening the duration. So for extreme stop-motion shots, you need multiple flashes, all synched together, all set to minimum power, to create sufficient light at a high enough speed to freeze extreme motion.
Or, of course, honking-big studio strobes with oodles of watt/seconds, so they are still bright when powered down :-)
R.
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