Originally posted by photog The K10 certainly did under-expose. My K20 on the other hand gives me very close to the ideal of ETTR
ETTR might be ideal from one particular perspective - the goal of minimizing noise - but it isn't the "ideal" in any more general sense. It's usually overexposed by ordinary aesthetic and traditional photographic senses, and usually requires one to then reduce exposure in PP to get a natural-looking photo. And in any case, it definitely is not the "correct" standard exposure - it's just one way of exposing to achieve a particular effect. The international standards for "correct" exposure specify something else entirely - something in which the average is somewhat *left* of center in the histogram, and the right side of the graph may or may not come anywhere near the edge. That is to say, ETTR is not something you should be expecting the camera to be doing for you, and a camera is not underexposing if it doesn't do this. Rather, ETTR is something *you* are supposed to dial in using exposure compensation as necessary, and "correct" exposure is usually a significant amount further left than what ETTR would have.
All of this is to say, it is incorrect to accuse a camera of underexposing simply because it does not use ETTR by default - that is not what a camera is supposed to be trying to do. If you want to use ETTR, you need to learn to dial in the proper amount of compensation to make it happen yourself.