On Wed, 1 Mar 2000, Gregg Iverson wrote:
> It would be fun to try that much flash power. BTW, what is the
> relationship between watt seconds and guide numbers. I don't believe I
> have ever seen a comparison given.
It's not straightforward enough for a straight comparison. Watt seconds
(or Joules) is a measure of the energy of each flash, the guide number
also depends on the shape of the beam.
--
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