I had one of the K5s that was so out of spec that nothing could fix the
AF. I did the software upgrades, hoping that they would fix the AF, but
it turns out the hardware was too flaky.
Mine was so bad that even in broad daylight, the AF would vary depending
on the subject matter.
The only way I could secure reasonably accurate AF was to use live view
and stop down to f/11.
I despised that camera.
bill
On 3/19/2016 8:43 PM, Rick Womer wrote:
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
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