A camera's dynamic range

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Originally Posted by george013

Thanks both of you Dave and Ted. I never knew how the [ISO] was calculated.

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You're welcome, George.

The standard allows manufacturers to calculate the ISO rating for their cameras from several alternative methods and we both chose the simplest of those, which is derived from the previous film method ISO = 10/Hsat.

Good article here: http://www.cse.wustl.edu/~jain/cse56...ens/index.html