Inverse-Square Law?

Started Feb 15, 2011 | Discussions thread
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photocellulite New Member • Posts: 17
Inverse-Square Law?

What are they talking about in this video, twice the distance equals 1 f-stop?

http://lightenupandshoot.blogspot.com/2010/05/depth-of-flash-exposure-aka-inverse.html#comments

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