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General Photography
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<blockquote data-quote="WayneF" data-source="post: 329794" data-attributes="member: 12496"><p>LOL</p><p></p><p>It is just the log of the ratio squared, divided by log 2.</p><p></p><p>The same calculation (that shows f/stops difference) applies to f/stops, to inverse square law distances, and to flash guide numbers. So I have a similar calculator in those three places on my site, which shows two decimal places, instead of rounding off to third stops.</p></blockquote><p></p>
[QUOTE="WayneF, post: 329794, member: 12496"] LOL It is just the log of the ratio squared, divided by log 2. The same calculation (that shows f/stops difference) applies to f/stops, to inverse square law distances, and to flash guide numbers. So I have a similar calculator in those three places on my site, which shows two decimal places, instead of rounding off to third stops. [/QUOTE]
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