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I read somewhere (maybe here) that Canon adjusted their ISO numbers to be the same as ISO (nternational Organization for Standardization) standards. If that's true, do you know which models did they start the adjustment with
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The XTi/400D was the first body to match ISO to film speed, as far as I know. Before, the cameras tended to be something like 2/3 stop faster, so 100 was really 160, and so on. My experiences matched this, as my friend shooting his 1D Mk.II got 1/800 of a second when I was getting 1/500 of a second with that other brand of camera.
DPreview publishes "actual sensitivity" of the cameras in its reviews.
...now where's John to talk about how a new system for denoting sensitivity is needed?