> Date: Thu, 18 Mar 1999 10:38:59 +0100
> From: Eertmans Nicolas <[EMAIL PROTECTED]>
> Subject: RE: F100 and flash questions [v04.n304/17] [v04.n309/9] [v04.n310/13]
>
> >Flash duration varies depending on the individual flash
> >and the amount of light required for correct exposure,
> >but it's always brief enough to freeze almost anything.
>
> Well, at full power, a flash strobe is usually quite slow. Somewhere
> around 1/150s. Flash duration rapidly decreases with power (around
> 1/500s at 1/2 power, shorter than 1/10.000s for very slight flashes).
> This effectively very slightly decreases the available guide number when
> used with a high-speed sync cameras (1/250s or 1/300s), which is not a
> big deal.
>
These numbers can't be right -- especially that full power duration
is 1/150s. Many of Nikon's cameras give *full* sync at 1/250s
shutter speed. The duration of full-power flash HAS to be shorter
than that.
The term "high-speed sync" explicitly refers to using flash at
shutter speeds higher than the sync speed (e.g. higher than 1/250s
or 1/300s for the F5).
I don't have my speedlight manual with me, but I thought that the
flash duration v. power tables were given in there.
Chris
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