Here's the LensAlign I made .... thanks to xbow for the graphics.
Now I've noticed a strange behaviour with my replacement K-5. I put my sigma 30/1.4 on it and it focussed spot on in daylight without any AF fine tuning. Cool! - it also focussed spot on at EV2 ( most of the time ) - Also cool.
today, after making the SmegAlign I decided to calibrate my lenses. I put my FA50/1.4 on and that needed no adjustment either. Cool!
I then put another lens on which did need some adjustment. so after turning on AF adjustment and calibrating this lens, I then put the Sigma 30/1.4 back on and it was really back focussing. It needed a +5 to calibrated it again. The same happened with the FA50/1.4 which needed -10 to calibrate it.
A bit flabbergasted by this I reset the AF fine tuning and turned it off. Both the Sigma 30/1.4 and the FA 50/1.5 showed back focus and front focus respectively and the need the +5 and -10 to correct them
So it seems that simply turning the AF Fine tuning on does something permanent to the AF system, which even a reset won't cure.
I'm taking delivery of my 2nd K-5 tomorrow so I'll be sure to test this again with the new camera.
note: this was all in daylight and was nothing to do with any front focussing in low light. In fact the front focussing behaviour with the replacement K-5 is working fine ( most of the time ) with the sigma in daylight and EV2. AFing with 103 in low light is still inconsistent.