LUX

SLavictoire

SLavictoire

Well-known member
I didn't know where to put this subject, but since I'm about to speak about lighting, I think it's the best place.

I try to covert must of the things with a new camera, XLR inputs, AVCHD, low-light conditions. On BH when a see the "minimum illumination" must says 1 Lux, but with gain and slow shutter... So I was wandering if we are able to know the basic lux without the gain and a normal shutter of a camera... Others says 1 lux, but is it basic without gain?


Thanks for helping me out!
 
Perhaps a basic understanding of LUX in relation to EV or F stop and shutter speed with a given ASA can help us determine the “minimum“ illumination necessary for “proper“ exposure. Mind you, 1 lux is an extremely low amount of light and is used sparingly by camera manufacturers to indicate the sensitivity performance of the capturing device. There are many factors in the final equation as to how much light is enough or needed. There comes to play factors as gain, ASA, shutter speed, F stop used, available light present etc. etc.
A good point of reference should really be a chart indicating the relationship between lux, EV, ASA . F stop and of course shutter speed. I have found a few. What I find is important to know, is how my camera performs at low light levels, and that is only determined by actually using it without gain and at my usual 30fps setting. Anyway charts here are just a reference to how much this or that equals that. An actual camera test is the ultimate answer.

http://www.sekonic.com/support/evluxfootcandleconversionchart.aspx

http://en.wikipedia.org/wiki/Exposure_value ( check down the page to the conversion chart)
 
A 1 lux rating doesn't really mean anything for most use. That's calculated with the maximum shutter speed and gain.
Just to put it in perspective, 1 lux is roughly a tenth of a footcandle. At 800 ASA, F/1.4, 1/48, you need something like 3 footcandles. So even on an Alexa with a master prime, you need FIVE more stops of light than the so-called minimum illumination that camcorder manufacturers put out there.
 
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