# i lost my notes lux2ev

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• 06-10-2012, 05:21 PM
RalphLambrecht
i lost my notes lux2ev
i lost my notes .does anybody have an equation handy how to convrt lux into ev and visa versa?
• 06-10-2012, 05:59 PM
Mahler_one
Hi Ralph:

From Ben earlier today....Check-out ehow.com. Converting Lux to EV; 5.5L=1 EV

Elliot
• 06-10-2012, 07:35 PM
Brian Puccio
Stack Overflow says:

Quote:

Quote:

EV Lux
-1 1.25
-0.5 1.75
0 2.50
0.5 3.50
1 5.00
1.5 7.00
2 10.00
2.5 14.00
3 20.00
3.5 28.00
4 40.00
1 EV is 5 Lux. 2 EV is 10 Lux. 3 EV is 20 Lux. Hmmm. It looks logarithmic:

Quote:

lux = (2 ^ ev) * 2.5;
(2 to the power of EV, times 2.5)
See also the Wikipedia article.

You can also use Wolfram Alpha, which, e.g., confirms the above math by calculating 10 EV to be 2560 lux.
• 06-10-2012, 09:21 PM
fdisilvestro
Just remember that those values are for ISO 100, otherwise you have to adjust accordingly.
• 06-11-2012, 09:17 AM
RalphLambrecht
is there an equationthat considers film speed?
• 06-11-2012, 09:22 AM
Steve Smith
Quote:

Originally Posted by fdisilvestro
Just remember that those values are for ISO 100, otherwise you have to adjust accordingly.

Or call it LV.

Steve.
• 06-11-2012, 10:28 AM
RalphLambrecht
i call it luve
• 06-11-2012, 11:36 AM
andrew.roos
Quote:

Originally Posted by RalphLambrecht
is there an equationthat considers film speed?

Based on Brian's equation

lux = (2 ^ ev) * 2.5 * 100 / iso

Where iso is the film speed.
• 06-11-2012, 12:55 PM
Chan Tran
But if you have an illuminance reading in Lux and want to covert to EV it's a bit more difficult.
Log(Lux / 2.5) / Log(2)=EV for ISO 100
• 06-12-2012, 10:23 AM
Mahler_one
Hmmmm....I think I'll stay with EV values.....:}
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