Some help with GN calculations

Started Dec 26, 2011 | Discussions thread
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diyphotographystuff
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Some help with GN calculations
Dec 26, 2011

Hi

I want to know whta are the differences in STOPS between two different flash units with different GN's.
Lets say on has GN43 and the other is GN58.

If I put the bigger at 1/4 power, what will be the power I'll have to set the smaller one to get about the same output?

PS,

I think there is a 1 stop between those two, but I'm just guessing (square(58/43))= 1stop.

TNX!

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