Hi Neil,
> >Now, your mileage may vary. Maybe there's a reason FP should be on
> >your want/need list. It's never been on mine and I would not pass up
> >a particular camera or system due to its absence.
>
> Maybe you want to shoot a lot of photos of people juggling tennis
> balls or oranges and having them appear suspended blur-free in
> mid-air. :)
>
For stopping-action flash pics, you'd want to use x-sync and the widest
opening possible, since that will minimize the amount of power needed
from the flash and reduce the burst duration.
While shooting at x-sync, flash duration is (aprox) 1/10000 s (and
depends on needed power). When you cross the x-sync barrier going to FP
flash, you're actually forcing the unit to emit light for a much longer
period. Thus: FP flash at 1/500 will last aprox 20x longer than normal
flash at x-sync (1/90, 1/125 or 1/250 depending on your EOS model).
Greetings,
Gerard.
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