As you have ruled out the lower priced but admirable K-30 it seems a simple choice between the K5 or the K5 II if you can afford the considerable extra cost.

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That's what I've done David and it's fine. I agree it doesn't make much sense as all the other lenses worked fine after calibration. It must have been a software glitch somewhere that only affected that lens, Most odd, I'll just have to wait and see if it happens again.

Yesterday my 100mm WR DFA Macro lens started behaving oddly. The autofocus was jerky and inaccurate. The back button I use for autofocus seemed to fire the shutter or at least flip the mirror! The exposure readings were flashing in the screen. Then it would fire the shutter after a few seconds without touching it. I tried removing, cleaning contacts etc and it would fire once normally then revert to fault thereafter. One time I couldn't turn it off. It was like a ghost in the works. The K30 worked fine with all the other lenses. So I tried it on my friend's K5 and it was fine. A real strange one. Trying to think what could have changed I thought it might have been the first time I used it since calibrating my lenses. The lens was set on +7. I reset it to 0 and low and behold it started working normally. I then changed it to +5 and still ok. Haven't risked going back to +7.
The calibration didn't effect any other lenses.
Seems impossible to me - I guess the change must have corrupted something in the software, although you would have thought that switching on and off would have reset it.
Most odd, thought I'd report it just in case something similar happens to someone else.
Dave

To answer my own question above - No! Now have the 50mm, the 70mm adapter and Lensbaby aperture disks. Tried out at f4 in the sun and am getting a lot of PF especially with the 70mm. Also struggling with focusing handeheld, can't see the focus peaking in the sunlight. Results very average so far. I think I will have to try the tripod which defeats the benefits rally. Think I may stick to it with its excellent 01 prime and the 300mm DA* on the tripod for its astounding results.
Dave

I used a test chart which I set up at an angle to see if it was front or back focusing then tried different settings so I suppose it was similar. I think I will fine tune it now using your method.
Joe, I wouldn't think it matters too much but I'm guessing just outside the minimum focusing distance for the lens with a fairly wide aperture will maximise any errors.
Dave

However, on trying the Takumar 200m 5.6 outside on the Q it was very unsatisfactory with massive CA and difficult to focus, focus peaking not seeming obvious if present at all

Pentax Q, plus 200mm F5.6 Takumar, + 13mm extension tube. From 2 metres indoors, F11 2 sec exposure.,very difficult to focus so sharpened although I'm sure it would have been sharp if I could have nailed it.Uncropped. Such fun. Butterflies?

Takumar 200mm F5.6 preset.

Thanks David. I have PK Tether already but what about the actual test, what did you focus on to do the check accurately? Last time I used a line of AA batteries at 45 deg to the camera and focused on the middle one.

Was the Sigma 150-500 out by much David? My DA*300 is +7 on the K30. Is there a thread on the best way to go about it. I used the line of AA batteries at 45 deg but wasn't certain if I should use the widest aperture during the test.
Dave