We've had less than optimal lighting conditions for several days because of cloud cover, but I've been able to take some pictures with the Pentax K10D and both an older, non-autofocus telephoto zoom lens, and using an adapter to mount it on my 8" f/7 reflector. (For those of you who think in camera, that's a 1414mm f/7.)
These pictures were taken with an 80-205mm zoom (equivalent to 120-307mm, because of the difference in sensor size relative to 35mm film size). As you can see, at the high end, the image quality degrades substantially.
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This picture is of downtown Horseshoe Bend, using the 8" f/7 reflector. I'm not sure how much of the lack of crispness was failure to get a proper focus (although the camera though it was as sharp as it could get), and how much was the limitations of distance and atmosphere. The target here is six miles away from me, and down.
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