Archived posting to the Leica Users Group, 2006/01/16

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Subject: [Leica] OT: EV to lux conversion
From: brad at bradbrad.com (brad daly)
Date: Mon Jan 16 14:07:46 2006
 
esteemed optical knowledgees,

i need to know how to convert EV readings to lux.  i have found the  
formula

lux = 2.5 x 2^EV

siting here at my desk, i have an EV reading of 8, so

lux = 2.5 x 2^8

or

lux = 640

what i really need to know is this, if the original formula is indeed  
the correct one.  that is, i need to be able to solve for x in this  
equation:

10,000 lux = 2.5 x 2^x

i need to know what EV reading equals 10,000 lux.

the problem is that i can't remember how to solve for x as an  
exponent.  fairly simple math, i realize, but something i've  
completely forgotten how to do.



--
brad daly
brad@bradbrad.com
http://www.bradbrad.com

What Would Bill Hicks Say?

All photographs are accurate. None of them is the truth.
     --Richard Avedon
Replies: Reply from jwlee01 at gmail.com (John Lee) ([Leica] OT: EV to lux conversion)
Reply from philippe.orlent at pandora.be (Philippe Orlent) ([Leica] OT: EV to lux conversion)