----- Original Message -----
From: "William Sommerwerck" <williams@xxxxxxxxxx>
> > William Sommerwerck wrote:
> >
> > > The guide number listing for Super FP mode shows that the square of
the guide number divided by the shutter speed is a constant at all shutter
speeds. This means that, even if the duration of the Super FP flash varies,
it has _no_ effect on the flash's output.
> >
> > Right.
> >
> > > So the question of _why_ there is a difference in duration remains.
> >
> > To save battery power.
>
> Non-sequitur. How can you have constant flash output AND save power
[sic -- you mean energy]? The energy has to come from somewhere. Equal
exposure requires equal energy taken from the battery.
>
You didn't listen, the flash intensity is not changed but the flash duration
change, so the capacitor discharge for a shorter time and hence it need a
shorter recharge.
C.H.Ling
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