A practical example of the difference in flash duration based on lens setting
and distance from the subject and how to manipulate it can be seen in my TOPE
16 shot. The theme was "Movement or Motion."
http://www.tope.nl/tope_show_entry.php?event=16&pic=10
Walt
--
"Anything more than 500 yards from
the car just isn't photogenic." --
Edward Weston
-------------- Original message ----------------------
From: "Andreas Pirner" <AndreasPirner@xxxxxx>
>
> Joel Wilcox wrote:
> > Thanks Chuck. I had read somewhere that electronic flash is about
> > 1/40,000 sec. I never would have discovered what you came up with.
>
> 1/40,000 sec. is pretty much the shortest flash
> duration that occurs when the flash is very close,
> lens wide open and not diffusion of any kind.
> I guess it is determined by regulating/measuring
> electronics, the behaviour of the flash tube itself
> (it 'burns' in a curve too, pretty steep flanks,
> but still a curve, kinda tailing off).
> The longest flash duration is full power of a
> single head high power studio flash. That may
> comes close to 1/200 sec. (as already stated
> in another post).
>
> Andreas
>
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