I walked to the post office today to mail some Magic: the Gathering cards to Seattle for my son, and I had my K-3ii with me . . . and an old non-Ai Nikkor 24mm f/2.8, attached with maybe 1/16th of a turn. I'd shot with it before when I first got it, but not much, and not outside: mostly close subjects inside.
On the way home I discovered something odd: when mounted on the K-3ii, the Nikkor 24 doesn't focus to infinity, or anywhere close. And while the close focus distance is marked at right around 1 ft (0.3 m), I managed to focus at around 0.75 ft, or 9". At least that's the best I reconstructed things when I got home.
Even stopped down, the DoF wasn't that great, perhaps since I was focusing closer than the lens was made for.
I managed to get this image of a serviceberry leaf--nothing very good, mind you, but the bokeh is interesting. I made this at iso 400, 1/160 sec., either at f/2.8 or f/4. I left it at full-frame so show how the lens rendered it.
Now I want to mount it on a Nikon and see how it behaves--if the focus is really messed up, or if it acts that way only on Pentax bodies. . . .