Using the preview image on the K10D can be useful, but only in certain circumstances. If one is taking a controlled shot on a tripod, where the image is not going to 'vanish with the moment', then it is ok. If, on the other hand, one is taking shots at a sporting event, then the shot will be missed. So I tend to take the shot, check the histogram afterwards, sometimes and correct any problems, if any, in the Adobe Bridge raw converter. I don't think a live histogram would be that useful to me on most occasions.
After all, in the days of film, one relied on the camera's meter and ones own knowledge of its limitations. I tend to still work that way now.
-------------------- David.
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I see the world thro' a viewfinder, but the world watches me via CCTV!