My camera uses sensor-shift (in-camera) image stabilization, which Pentax calls "Shake Reduction". This is activated on shutter half-press, and takes as long as a second to "settle" — if I take a picture faster than that, it's recorded in the metadata as "On but Disabled".
That's okay — I'd rather get the unstabilized shot than have to wait — but I'm wondering if this actually makes things worse than if I just left shake-reduction. Is it possible that the floating sensor is adding blur before it's locked in? I have the intuition that it might, and have heard as much in online discussions, but the manual only says that the system isn't effective before it's ready, not that it could cause problems.
On my normal prime lenses I'm usually either working carefully or at shutter speeds where SR isn't a big deal; with the DA★ 200mm indoors, I'm finding I'm often pushing against the shutter-speed-for-focal-length rule of thumb.
For my specific camera and immediate concern, I'm interested in Pentax's sensor-shift stabilization system, but I'd also like to know how other systems are affected, including both sensor-shift and lens-based.