So I guess I've ben having auto-focus inconsistency problems. I'm not quite sure what is going on, but I'm beginning to think that it is with the camera, not with my lenses. I started noticing it when I bought my Tamron 28-75 f/2.8. That's only because I heard it has issues, so that's when I started paying attention. It could have been happening before that, but I pretty much didn't know good focus if I saw it. Then I started noticing my Pentax 14mm f/2.8 what semi consistently back focusing. Then I just got a Pentax 50mm f/1.4, which is amazingly sharp, when the focus is on. I believe the kit lens does the same thing, although I pretty much never use it. So the issue seems to be that all my lenses are randomly having focussing problems, and it seems to be consistently to the back. And I don't mean like, oh it's really dark kind of auto focus problems, or I took the picture before AF locked on kind of problems. Also, it doesn't seem to take like on shot in, then one shot out; but more like it'll be fine for a while, then it'll have issues for a day or for 100 shots or whatever. The other day I was doing an engagement shoot for some friends, and the middle third of the shoot it was just giving me a bunch of problems. As in, they're standing against a wall, and I have the AF point on one of their eyes, and the wall behind them is sharp. The camera was on selected spot metering of whatever it's called, not matrix of anything. Or using the 50mm wide open for a close up of the ring, and the finger behind it is in focus. But earlier and later, everything was spot on. So I'm wondering if it could be some kind of issue with the camera that is causing AF inconsistency issues. Sorry for the exceptionally long paragraph, but that flowed out of my head like a rant. Thanks!