Originally posted by BryantCP Interesting, I don't recall very many complaints about "limited focusing accuracy" of the K-5. I think that Hoya did correct most of the problems attributed to the K-5 by the time production ended. My K-5 was purchased new just 2 or 3 months before the introduction of the K-5 II (s) versions and has not had any issues other than the tungsten light issue. Focusing accuracy has not been an issue with mine.
For a long time I would have said that viewfinder AF wasn't a problem for me too (although I rarely deal with tungsten light), it was really only after I:
- obtained higher-resolution and faster lenses
- did careful comparisons between all 3 focusing modes: manual live view, magnified, live view, and viewfinder AF
that I became somewhat disenchanted with viewfinder AF. It's not like I would have necessarily said that the viewfinder AF was off just looking at one image, because most of my pictures appeared reasonably sharp. It was only in repeated comparison testing where viewfinder AF wasn't producing results as consistently sharp as live view. I don't have other brand dSLRs I've used for more than quick trials so I can't compare the K-5 with them.
I don't know about the K-5 tungsten issue being resolved. Just from what I'd read I'd thought it was a hardware problem that couldn't be fixed with firmware. I didn't think there were any changes to related hardware during the K-5 production run but could be wrong.
Ironically, I've also decided that diffraction is less of a practical issue than I'd thought (maybe somewhat due to the aa filter and 16 vs. more mp), but that insufficient depth of field when images are viewed at higher magnifications is more of an issue. So ultimately some of the added sharpness from alternative means of focusing may be lost for me now due to more often using smaller apertures.
Also some of my issues with viewfinder AF may be due to my inability to select a single microfocus adjustment that works at various focal lengths. Except for my macro lenses, all my lenses are zooms. Presumably the new K-3iii will have a more sophisticated adjustment capability with multiple adjustments available at various focal lengths.