Originally posted by photoptimist ... the nose knows what to do -- changed the drive mode to multiple exposure.
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BINGO! I never knew my nose was that mischievous
Checking the photo info on the K-3 I note that the first shot today was a single exposure. 5 minutes passed before I took the next photo, which was in multi-exposure mode. In all 12 exposures on my camera show they were taken in m-u mode before the power off/on. What made it more confusing is that not all of them were actually double exposures. Had they been so, I hope I might have worked it out for myself. Playing with the camera just now also identified why they weren't all crap. Pressing the Playback button after taking the first of the 2 multiple exposures means the file gets saved with only the one exposure. It still shows as a multi-exposure shot but it isn't.
Many thanks, I was beginning to think that the K-3 was playing up. Now I am retired, I am not sure I could afford the repair, let alone a new camera.
Finally, I believe the reason my nose became "active" is that the first shot was a bird in flight. So the camera was following it around. Plenty of opportunity for my snout to play an April fool a day early.
Thanks again