Update. I called Pentax and explained the concern. All that could be offered--and the best under the circumstances-- was to send lens and camera in, which I have been considering, but got busy with my life and finally had a little time this morning to re-visit the issue before shipping. Again went through all the motions (and considering the kind advice from those who commented--thanks by the way) with K-r, k5, and K20D with DA*55mm, DA*300mm, and the DA*300mm and came to same conclusion: All 3 lenses work in a marvelous fashion with the K-r and K5 plus the 55 and 300 work fine with the K20D, however the DA*200mm just won't auto-focus with the K20D. I then meticulously cleaned all electronic contacts, K20D and DA*200mm both, still did not work. I then mounted a couple of new acquisitions of manual focus Pentax legacy lenses on the K20D just to test 'em and give the autofocus thing a rest and went back to the DA*200mm thing. What do you know, the K20D and DA*200mm finally introduced themselves to each other and autofocus together in a world class way. I absolutely do not understand what was or was not happening. Happy ending, I hope. The camera and lens are going to the baseball game with me tonight for a workout.
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