i lost my notes lux2ev

RalphLambrecht · Jun 10, 2012

i lost my notes .does anybody have an equation handy how to convrt lux into ev and visa versa?

Mahler_one · Jun 10, 2012

Hi Ralph:

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

Elliot

Brian Puccio · Jun 10, 2012

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

Click to expand...

1 EV is 5 Lux. 2 EV is 10 Lux. 3 EV is 20 Lux. Hmmm. It looks logarithmic:

lux = (2 ^ ev) * 2.5;

Click to expand...

(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.

fdisilvestro · Jun 10, 2012

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

RalphLambrecht · Jun 11, 2012

is there an equationthat considers film speed?

Steve Smith · Jun 11, 2012

fdisilvestro said:
Just remember that those values are for ISO 100, otherwise you have to adjust accordingly.

Or call it LV.

Steve.

RalphLambrecht · Jun 11, 2012

i call it luve

andrew.roos · Jun 11, 2012

RalphLambrecht said:
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.

Chan Tran · Jun 11, 2012

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

Mahler_one · Jun 12, 2012

Hmmmm....I think I'll stay with EV values.....:}

RalphLambrecht · Jun 12, 2012

me too!

Vaughn · Jun 12, 2012

RalphLambrecht said:
i call it luve

All you need is luve -- just ask any Beatle...

i lost my notes lux2ev

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