Hi Paul,
And a third way is that the focal plane shutter slot is wider for any
given shutter speed.
Tom
On 17 Dec 99, at 18:25, Paul D. Farrar <olympus@xxxxxxxxxxxxxxx> spoke about
*[OM] Why Minolta FP flash is so muc,* saying
> The reason Minolta's FP flashes are so much more powerful (even usable) is
> the camera's high X-sync speed. Even though the FP works above the X speed,
> the faster shutter alows more efficient use of the energy storage capacity.
> The reason is that the FP flash must be on for all times any part of the
> shutter is open. This time is at least X+S, where X is the travel time (and
> X-sync speed) and S is the shutter speed. Since any part of the film will
> only see FP flash for S, the maximum possible efficiency of an FP flash is
> E=S/(X+S). For S=X, E=1/2;
> for S=X/2, E=1/3; etc. At 1/500s, on OM (X-sync=1/60s) can have a maximum
> efficiency of 1/9, but a Minolta(X-sync=1/250s) can have 1/3. So at that
> speed, Minolta can have triple the flash from the same storage capacity.
>
> Another way of looking at it is that the Minolta exposure takes less time,
> so the FP flash can be more intense.
>
> Paul Farrar
-----------------
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