Exposure control in a raw developer: misnomer?

Started Jan 30, 2013 | Discussions thread
Great Bustard Forum Pro • Posts: 40,847
Re: Absolutely correct.

dosdan wrote:

Great Bustard wrote:

It's funny, 'cause if you ask someone who considers ISO part of exposure, and you ask them if f/2.8 1/100 ISO 100 and f/5.6 1/100 ISO 400 result in the same exposure for a given scene, it's exceedingly rare that the answer to this simple yes or no question will take the form of "yes" or "no".

GB, ask them this: if they consider these 2 exposures to be equivalent, what about the 2x worse shot noise SNR in the ISO400 shot due to the 1/4x smaller total number of photons collected during the exposure period?

For many, "exposure" = "brightness".  Here's another conundrum for you:  does f/2.8 1/100 ISO 1600 on a 5D have the same exposure as f/2.8 1/100 ISO 1600 on a 6D?  After all, the noise is most certainly not the same.

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