i lost my notes .does anybody have an equation handy how to convrt lux into ev and visa versa?
Printable View
i lost my notes .does anybody have an equation handy how to convrt lux into ev and visa versa?
Hi Ralph:
From Ben earlier today....Check-out ehow.com. Converting Lux to EV; 5.5L=1 EV
Elliot
Stack Overflow says:
See also the Wikipedia article.Quote:
1 EV is 5 Lux. 2 EV is 10 Lux. 3 EV is 20 Lux. Hmmm. It looks logarithmic: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
(2 to the power of EV, times 2.5)Quote:
lux = (2 ^ ev) * 2.5;
You can also use Wolfram Alpha, which, e.g., confirms the above math by calculating 10 EV to be 2560 lux.
Just remember that those values are for ISO 100, otherwise you have to adjust accordingly.
is there an equationthat considers film speed?
i call it luve
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
Hmmmm....I think I'll stay with EV values.....:}