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What is the quantative relation between flash guide number and ISO?

I found that formula on the Internet: Guide Number = (Shooting Distance * Aperture) ÷ ISO Sensitivity Is it correct? If it is could someone please explain why ISO is related to guide number in this ...

asked Oct 31 '11 at 18:58

Shvetusya
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Moonrise & Aurora by Jakub submit your photo Picture of the Week Themes Suggest and vote on themes Please participate in Meta and help us grow.

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What is the quantative relation between flash guide number and ISO?

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Moonrise & Aurora
by Jakub

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