Well, I have done a good deal of web research and experimentation. First, and most importantly, since I use the viewfinder for 99+ percent of my shooting, I adjusted the AF for the viewfinder for my three most-used lenses (16-45, 40 Ltd, 50-200). It is much better, thank you.
Second, the K-5 did, indeed, suffer from very inconsistent viewfinder autofocus (phase detection) with different intensities and color temperatures of light. It needed light toward the blue end of the spectrum to focus accurately, and low-level tungsten light just made it wet its pants. From what I read, this was partially corrected in firmware 1.03, and corrected further in 1.15. There were hardware changes in the K-5 II and K-3 that reportedly eliminated the problem entirely. Third, even though contrast-detection AF (which is what Live View uses) is working with the image on the sensor, it also can be crazily inaccurate for reasons that nobody seems able to explain. So, I've decided not to worry about it. Cheers, Rick http://photo.net/photos/RickW On Sat, Mar 19, 2016 at 9:18 PM, Igor PDML-StR <pdml...@komkon.org> wrote: > > > Rick, > > I am not sure. I can speculate that the difference could come from: > 1) method of AF (isn't it different from LV and through viewfinder, - I > forgot how it is for K5/K3). > 2) number of sensor points used in the two cases. > > Also, Bill (or somebody else?) mentioned in this thread that some colors can > throw off the AF. I was not aware of that. > > Igor > > > > > > Rick Womer wrote on Fri Mar 18 08:36:46 EDT 2016: > > The strangest things about these AF experiments are: > > 1. Front-focusing on LiveView, which (I thought) sought to maximize the > contrast of the image on the sensor, and thus should be IN FOCUS regardless > of the lens in use; and > > 2. The 16-45 front-focusing with LiveView, and back-focusing with viewfinder > AF. > > Thoughts? > > Rick > > > -- > PDML Pentax-Discuss Mail List > PDML@pdml.net > http://pdml.net/mailman/listinfo/pdml_pdml.net > to UNSUBSCRIBE from the PDML, please visit the link directly above and > follow the directions. -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.