Originally posted by Marcus I think the next big innovation for cameras will be the live histogram in the viewfinder. I was hoping the K20D would have it and now I'm hoping the next Pentax cam will have it.
k20D already has that...it is called "Live view." Since a histogram represents the number of sensor pixels at a given light level, I don't think you can have a DSLR with histogram in the viewfinder unless it is an EVIL type (but then it is not an SLR.) Remember in an SLR, the sensor is not exposed until you press the shutter.
Some day, if EVIL viewfinders are as fast and accurate as the optical type, you can then eliminate the mirror, and pentaprism, and the camera also becomes smaller. You could also then have the live histogram like they do on point and shoot cameras. Auto ISO then becomes easier as well, because you never have to worry about blowing out highlights. The ISO could be automatically set by the histogram instead of a separate light sensor. Also, auto focussing becomes more accurate because you can have true feedback control between the image to be taken, and the focus ring of the lens.
I think right now the problem is that image processing is still far too slow for EVIL to compete with SLR. That is why P&S cameras are so slow compared to our SLR's when you include focus, metering, and exposure times.