title: How to convert between lux and exposure value?
body: <p>How to convert from an <a href="http://en.wikipedia.org/wiki/Exposure_value#EV_as_a_measure_of_luminance_and_illuminance" rel="noreferrer">exposure value</a> to <a href="http://en.wikipedia.org/wiki/Lux" rel="noreferrer">lux</a>? Thanks!</p>
  
  <p>i.e. what's the formula behind <a href="http://www.sekonic.com/support/support_2.asp" rel="noreferrer">this chart</a>?</p>