Re: [photo-3d] Multiple flash...

[Oliver Dean <3d-image@xxxxxxxxxxxxxx>]

Hi, Dr. Dave!

Your detailed answers were articulate and informative! Thank you!

One answer was a surprise, though:

"David W. Kesner" wrote:

> Yes, you can build up flashes. Although you have to be good at
> formulas to calculate the exposure. If you need f8 for one
> flash it doesn't translate to f11 for two flashes.

Since two flashes of the same flashgun would be doulbling the amount of
light on the subject, which is similar to using a shutter speed twice as
long in normal light, why doesn't it translate into a 1 f/stop
difference?  Is there some sort of reciprocity effect at work here
because of the short duration of the flash?

Cordially,
Oliver Dean

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