> Thanks for the reply Dave. I will be using "what I have" but I
> will be forever curious as to the precise exposure duration.
> I will be using two 550ex units to illuminate the birds and two
> additional Nikon SB-28's to illuminate the background.
>
> Last summer I used high speed FP flash with shutter speeds of
> 1/8000. It was a technolgical "tour de force" in that I got
> tack-sharp, well exposed birds but an inky black background.
> I expected that mind but the slides do not project well and do
> not scan well either even though they are killers under a
> loupe on a light table. I have to fill in the background and
> wish to use my Nikon units to complement the 550's.
I saw an osciloscope graph of a (Canon) flash discharge... its not a very
"steep" curve, so flash "duration" might be difficult to define. Canon
has (in the past) stated 1/700 second for a full power burst, so you
might do the math from there.
FP flash shouldn't be necessary (and is a waste of power), low power
flash durations are certainly less that 1/8000 second. You could sell
your Nikon speedlites and buy a couple of 420EX's to illuminate the
background ...and still use E-TTL flash.
Dave Herzstein
[EMAIL PROTECTED]
http://www.kjsl.com/~dave
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