Joined the K5 Club Yesterday, but ..........
Do you have the camera set to AF-C? This setting will cause it to continually focus.
Not quite true John. Even if set to AF-C, you need to at least half press the shutter button to activate it, and the OP stated that focussing seemed to occur "without touching any buttons".
Thanks for your comments, I will investigate further, I have the camera with grip attached to a b grip belt and it's focusing while I walk, pretty weird really! I'll try leaving it in AF-S and manual and report back btw happens on different lenses, sig 50mm 1.4 and sig 24-60 f2.8 so far
I had that as an intermittent problem with my Samsung GX20 (K20 Pentax)when the batteryy grip was fitted. Never got to the bottom of it.
There was a problem with the K10D/K20D freezing with the grip attached. It was usually one of the wheels on the grip not being turned to the next "click" causing the problem.
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24265 posts
22 years
Tyldesley,
Manchester