Nicolas Alvarez wrote:
> In digital cameras, the sensor is receiving light all the time. What does 
> "exposure" mean there?

First, it's not.  At least in DSLRs. :-)

I suspect in things like the little cameras where you aim thru the LCD, 
there's either a non-mechanical shutter, or there's a wire that clears the 
sensor, you let it accumulate for some number of miliseconds, and then you 
read the sensor.

Second, if you're talking about the ISO setting rather than the exposure, 
that's about how much you pre-bias the electrons in the sensor. Basically, 
you load up each pixel of the sensor with some electrons, and if light kicks 
out an electron, you add one to the intensity of the light there. Adding 
more electrons makes it easier to get kicked out.

-- 
Darren New, San Diego CA, USA (PST)
   Linux: Now bringing the quality and usability of
   open source desktop apps to your personal electronics.

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