Originally posted by Class A It does, in low light. It is not perfect either, but it doesn't have the low-light AF bug the K-5 has.
In sufficient light, the K-5's AF is better than the K-7's.
I sold my K7, but it was quite similar to the earlier Pentax bodies I owned (DS, K100, K10, K20) in that it moved to FF as the light level was reduced and the color temp was lowered. In my tests it behaved almost exactly like my two K20s.
My two K5s are much better in this regard.
One of the biggest differences between them was that the earlier bodies simply hunted and hunted and hunted and hunted and often gave up sooner. I think that one of the problems with the K5 is that some portion of the AF system is too sensitive and it locks when it should give up, even below thhe specified range. It is a little unpredictable as to when it turns on AF assist as well.
I'm just not seeing a consistent AF "bug" in either of my K5s since the firmware was updated. That is not to say that it is perfect or that others do not have trouble, but in light down to the official specs my K5s focus better than any Pentax I owned in the past.
I can only be encouraged when I read that the K 30 is better yet. Here's hoping that the k5 replacement will be an even greater improvement so we can finally stop reading about AF complaints.
Ray