Hi all,
First, this is not a thread about blurry photos, its a thread about mis-focused photos. There was a previous thread that outlined another user's experience entitled "K3 AF Weirdness".
The Issue:
I would like to compare notes with you. I have a K3 (latest firmware) using various lenses (FA31, DA 20-40, 50-135). Its strange, but I have been feeling like an unusually large number of shots have been mis-focused where I know I properly selected the AF point. At narrower apertures, it could be misunderstood as blurry, but wide apertures (i.e., 2.0) tell the story well. For clarity, I am shooting raw in manual mode, minimum 1/180 of a sec, on and off tripod, single user-selected AF point.
My initial attempted solution:
When I first noticed the issue, I decided that perhaps the lenses needed alignment, so I used focus-tune and lensalign to determine the correct AFA position. When I printed the focus-tune reports, it was very clear that many shots were "way" off base. For example, in focus-tune, a perfect shot will have a reported focus value of 0. Lets say that I set the AFA in the camera to -3 and I shoot a series of photos. While most will have a reported focus value in the same range (for example, 100, 110, 90), I was getting a large number of shots that fell out of that general range (for example, 275, -100). Since I shot a large number in the series for each AFA camera setting, I threw out the outliers and determined the correct AFA camera setting with those that were remaining (for most lenses, an AFA setting of -1 or -2 worked).
The results.....Stunning sharpness, except for those photos that are mis-focused. In other words, the more frequent appearance of "outliers" were impacting the photos I take in real life. Real life impact example:
Shooting a person (from directly in front of them and at floor level), whom is resting their head on their crossed arms (they are laying down parallel to my position such that it is effectively like a head and shoulder framed shot). Focusing the single AF point on the eye, some shots have the eye in focus, others have their elbow (a few inches closer than their eye) in focus. To be clear, I am shooting at an aperture of 2.0 to to 2.4 which has a limited DOF field. Thus the problem is easy to detect because accurate focus is critical under these circumstances.
My ask:
Tell me your experiences. I have to decide whether to send the camera back for a replacement. I think the K3 is the most solid and sophisticated APC camera out there. I have been on the fence about switching after 7 years with Pentax. I want to stay. However, this is not helping