Originally posted by Tommot1965 your K5 and the one other thats been reported , is not typical of the FF suffered by the rest of us..Id suggest that you and the other PF member who has this issue, have a body that's is failing else where to have FF that severe
In my opinion that is what we are talking about
: malfunction AF under artificial light, NOT some mm fault at 43 mm focal length near the minimum focus distance which is 0,45m for the 43 mm limited, right? How realistic photographic situations is that? I believe all K5 will focus correct at that distance, mine do easily!
I bet you have this issue too and probably Christine too, but maybe you aren't affected, because you haven't photographed under those circumstances. But this is just a guess, if your bodies are ok, then we probably have a hardware issue here...
I own booth the K5 and the K7 and have run some tests with (18-55mm WR, 21mm limited and the Sigma 30mm 1,4). And I can for sure tell you that what Pentax describes as a
Highly responsive and accurate autofocus system with improved focus speed and reliability is only true regarding the speed, but not the reliability. At least in my case during dim light conditions, and obviously many others as well...