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.
Joel W.
On 1/22/06, Chuck Norcutt <chucknorcutt@xxxxxxxxxxx> wrote:
> So, I learned two lessons today.
> 1) When at full power a Vivitar 285HV takes longer than 1/500th second
> to do a full dump but not more than 1/250th. I'd have guessed the flash
> was much faster than that but it is not. While I haven't tested them
> yet I assume that this will also be found true for many other portable
> flash units.
>
> 2) The flash meter is just like the camera with respect to shutter
> speed. When set at 1/500th it means the flash is only measuring for
> 1/500th of a second. If the flash duration is longer than that it won't
> see it. I had never stopped to think about it before and assumed all
> electronic flash durations were in the range of, say, 1/10,000th of a
> second or faster. I didn't thing it mattered what the meter's shutter
> speed setting was except in so far as to compute the flash/ambient ratio.
>
> I has only taken me decades to learn this simple little tidbit so I
> thought I'd share it and maybe save you 10 or 20 years to learn the same
> thing. Treat the camera and meter the same with respect to sync speeds.
>
> Chuck Norcutt
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