Don, you can do very successful stitching using Pentax lenses. Depending on the final image size and format, you'll get the best results using the camera in portrait mode, overlapping the frames 35-60% and use the best lens you have available, at its best f-stop (typically 5.6, 8 or 11) for the situation.
It is better to use a longer lens to get more tiles for stitching, but beyond a certain point you start losing quality, as medium focal lengths can be sharper, and the added frames will introduce artifacts and geometric distortions that may compromise the final image. A focal lens between 28mm to 85mm works well in most situations. I found 3 to 7 frames is a good starting point.
Take a look at my Albums under Panoramas to see a few samples stitched from photos taken with the kit 18-55 WR lens and a K-7.
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