How to convert between lux and exposure value?

Question

How to convert from an [exposure value][1] to [lux][2]? Thanks! i.e. what's the formula behind [this chart][3]? [1]: http://en.wikipedia.org/wiki/Exposure_value#EV_as_a_measure_of_luminance_and_illuminance [2]: http://en.wikipedia.org/wiki/Lux [3]: http://www.sekonic.com/support/support_2.asp

Answer 1

(N ^ 2 / t) = (L * S) / 12.5, where:

N is the relative aperture (f-number)

t is the exposure time ("shutter speed") in seconds

L is the average scene luminance

S is the ISO arithmetic speed

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Hope that helps.