Discussion in 'Exposure Discussion' started by RalphLambrecht, Jun 10, 2012.
i lost my notes .does anybody have an equation handy how to convrt lux into ev and visa versa?
From Ben earlier today....Check-out ehow.com. Converting Lux to EV; 5.5L=1 EV
Stack Overflow says:
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.
Just remember that those values are for ISO 100, otherwise you have to adjust accordingly.
is there an equationthat considers film speed?
Or call it LV.
i call it luve
Based on Brian's equation
lux = (2 ^ ev) * 2.5 * 100 / iso
Where iso is the film speed.
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.....:}
All you need is luve -- just ask any Beatle...
Separate names with a comma.