Originally posted by JeffB You must turn off in-body SR stabilization when the camera is mounted to a tripod. This is clearly stated in every user manual of every camera. The reason is simple: you are creating a feedback loop. When the camera is fixed in position the movement of the SR system itself introduces movement that is detected and compensated for and detected and compensated for . . . . and on and on. That is why Pentax did such a great thing by automatically disabling SR when using the 2 second timer. A feature I use constantly.
It has been empirically shown that "must" is not an absolute. Some people have perfectly good shots, consistently with SR while using a tripod.
Can you also point to the page in a Pentax manual that states such things?
I found 21 pages in the K1 manual, (16 in the K3-ii manual) listing shake reduction - none mention turning off with tripod use.
I found 7 pages in the K1 manual (6 in the K3-ii manual) mentioning Tripod but only mention of Shake Reduction was the ability to use the sensor movement to adjust composition.
FYI, Having a tripod on a non-stable surface like a bridge or event otherwise stable ground near heavy traffic might be a useful time to have SR, even with 2-second timer or mirror lockup enabled.
There is a need to be careful about all-encompsing statements being used as absolute truths.