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Old July 8th, 2007, 11:42 PM   #1
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Lumens, to F Stop?

Anyone know a general way to calculate the f stop of a given light if all you know is the Lumens at a given amount of feet/meters? given a steady speed and iso rating?

I am trying to determine the ratings of some constant light sources and many only have lumen, or lux.

Thanks.

Stephen Eastwood
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Old July 9th, 2007, 11:41 AM   #2
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Stephen,

Take a look at this and see if it's what you want:

http://www.answers.com/topic/foot-candle?cat=health

It's a great question though for sure.
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