>>2939937Well, I can only say you're wrong, at least when it comes to shooting on RED, Alexa and some Sony cameras. I will explain again, but in short look at the picture here taken directly from RED's website explaining how their sensors work with REDCODE Raw.
>Higher sensitivity only adds noise, it does not reduce noiseCorrect, I never said it didn't. What I said was some cameras like the FS7 are set natively to a pretty high ISO (2000) and shooting at that ISO gives no apparent noise. If you crank up a 100 ISO-native camera to 2000, you will have noise yes.
>Higher sensitivity increases the exposure at all brightness, which means that you have less stops before highlights are lost to overexposure.This is true on low end cameras and DSLR's, in the sense that the ISO setting is a simple boost in electricity passed through the sensor, more or less, which increases what the sensor 'sees' and thus adds noise. But, as the picture here suggests, RED and Alexa ISO settings are actually mistakenly labeled ISO, as in fact the camera always shoots at whatever native iso it has, the correct term for them should be EI, Exposure Index. Remapping middle gray higher and lower DOES in fact give you more stops in the highlights the higher you go with the EI, as middle gray is pushed down.
So, again tldr: on DSLR's and most consumer/prosumer cameras, what you say is true and you shouldn't bump up the ISO like that, BUT on actual cinema cameras, as long as they function by the EI system, what I said is true. If you want a full explanation of this have a look at RED's site here:
http://www.red.com/learn/red-101/exposure-with-red-cameras 