Hi Chris!
I think the GN gives a clue to the distance for correct exposure.
With grey cards and stuff.
But I must admit your example makes me wonder...
Jostein
> -----Original Message-----
> From: Chris Brogden [mailto:[EMAIL PROTECTED]]
> Ok, stupid question time. Does using the guide number like
> this give you the maximum distance at which you can fully
> illuminate a subject, or is it the furthest that the effects of the
> flash can be seen, however minimally?
>
> For example, the 500FTZ has a GN of 50 meters.
> If I'm using an f2 lens (down to 25m now) and shooting
> with ISO 400 film (doubling the effective distance
> of the flash), can I really get a fully illuminated
> subject 50m away? Or is that just the furthest that I
> can reasonably expect to see some effects of the flash?
>
> chris
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