Originally posted by Snydly Does Pentax tell us in the manual to turn off SR while on a tripod because the tripod is 'better' than SR or because SR will create blur if there is none to counteract, or some other reason?
The SR algorithms expects motion generate by holding the camera in your hands and compensates for up/down, left/right and rotation, all typical of a handheld scenario.
A camera on a lightweight tripod will vibrate but the motion is quite different than handheld. Sources for the motion will include ground vibrations, wind, focusing the lens, unstable balance of the camera/lens combination, etc. The sensor will try to compensate but the results will be probably worse.
On a monopod is a different story. The up/down motion is eliminated but the left/right and rotation are still there as normal so SR should be effective. A special case may be for long telephotos with tripod collars where the camera is hanging. That may qualify for regular motions for the SR system but I am not sure. It would be a good experiment to do one day.