Originally posted by WMBP I've been reading with interest and trying my best to follow the thread "
Had a Problem" here. I've read other threads here and in other forums on subjects that seem similar but might not be the same. I do not have a K10D so I can't test anything for myself. And the issues seem pretty technical. Nevertheless, I'm rather interested because I continue to think seriously about trading my K100D in for a K10D. So I'm wondering if someone could give me a short version of the problems.
Specifically, I'm wondering about the following.
Is there a general problem with auto-focus on the K10D? Or is it limited to certain lenses or certain focal lengths?
Is the problem the sort of thing that should cause me NOT to buy a K10D now?
Does everybody have this problem? As far as I can tell, most of the K10D users here love the camera. Do most people not have the problem? Or do they have the problem but simply not notice it?
Will
I sent my first K10D back due to serious FF issues with every lens I tested, and I have quite a few (DA 14mm, DA 16-45, DA 50-200, FA 50 1.4, F50 1.7, 31 ltd, 43 ltd, 77 ltd, 24 - 90, 40mm pancake....).
It was not significantly better or worse with any given lens, and while it was somewhat better in sunlight versus tungsten light, it was still pretty far off.
With absolutely no explanation other than a note explaining that they were doing so as a "courtesy to me", Pentax sent me a new camera.
I have not done any critical testing, but so far the replacement looks to be ok, but not perfect (see below).
I bought a second body and it is also ok.
What I have noticed is a tendency to consistently pick the wrong focus spot when the lens is racking in from infinity, while it is spot on when racking out, at least when using my 31 ltd. I have not yet tried other lenses to see if this is consistent from lens to lens, but I suspect that it is. The error is pretty small and is not likely to matter in most situations.
So, it appears to me that most issues are related to quality control at the factories, not with the AF system in general. I guess that different lenses might also have design or factory QC issues that also affect AF, but looking at the way the AF system works, I doubt that the lenses are a big part of the problem. My thinking on this point is that if you can get a sharp focus manually, there is nothing inherently wrong with the optical alignment or main mechanical pieces in that lens.
I do not know enough about optics to know for sure whether different optical designs have a large impact on the AF systems in the camera, but some impact does seem to me to be at least likely based upon the way the AF system operates.
Ray