That's the screw-drive AF coupler. It should be retracted as per your K3 when the body is set to MF and protrude as per your K3ii when the body is set to AF (or at least that's what happens on my K3 :wink. In the AF position, pushing a lens onto the camera pushes the coupler into its hole then it springs into it's engaged (protruding) position when the lens is rotated to fully locked and it's aligned with the socket on the lens. Pressing the lens release button on the body retracts the coupler so the lens can be rotated for dismounting. So check that the coupler behaves correctly both when switching between MF and AF (and back again) and when pressing the lens release button with the body set to AF. If it does, then the coupler isn't the problem, if it doesn't then it might be an indicator of something wrong with the AF mechanism. And try the old favourite of cleaning the contacts, if the body and lens aren't communicating properly then anything could happen!

Steve

Yes, No. 3 is the Special One. The right pose, the right light, and you even managed to get a decent background, too.

Steve

Fascinating. Definitely a superglue iceberg. And beautifully photographed.

Nobody has commented on the thread title yet. Do you have one?

Steve

These pictures are superb, both technically and artistically. I luv 'em.

One could say that your artistic intent has been realised thanks to the capabilities of a fine lens. That having the new 100mm macro as well would expand the scope for fully realising that intent. That the new HD D-FA 100mm macro is actually a replacement for the current D-FA 100mm macro, not the A 100mm macro. And that having more than one macro lens at the same focal length would provide different photographic experiences. Etc. etc. etc. If you try hard, it's possible to think of lots of reasons for keeping the A while also getting the new one .

Steve

So you'll be printing it big and putting it on the bedroon wall???

Be grateful that you weren't thrown out of the window... But the shot you took as you flew through the air would have been one of a kind!

Steve

Gotta be careful though. I once drove off in our estate car with the tailgate up and a very worried dog in the back staring out into the big, wide world....

Steve

I really like this . There's something timeless about it, it could have been taken any time in the last few hundred years. The only thing I'm not keen on is the idea of getting up early...

Steve

There are some very bright, burnt-out areas. I wonder whether one of them is causing problems, perhaps internal reflections within the camera itself or even overloading the sensor's electronics. Do you still get an artefact with an ND filter if there are no very bright spots?

Steve

In the middle of the night while trying to get back to sleep I've fantasised about attaching the protractor to a spindle that has a worm gear which drives a big gear with lots of teeth that moves the camera by a very, very, very tiny step for every 1 degree rotation of the worm gear. Then in the morning I look at the focus rack and remember that it was just a fantasy...

Steve

When are you going to post an IR selfie??

Steve