# 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)

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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