Using my 3-month-old K5 with DA*200 & DA* 50-135 zoom, I'm noticing that I'm missing too many good shots because of softness. This seems to be true whether shooting a bug on a weed stem or portaiture. I shot about a dozen images of my wife yesterday evening in beautiful, low-angle, warm sunlight, and none were useable even though the AF was set at "center". When opened on my computer screen, all were back-focused by a few inches.
Today I set up a test shot using 5 table knives laid about 2" apart on a white countertop and perpendicular to the camera with the camera about 6-feet away. I focused on the middle knife with AF set on "center". I started with the 200mm lens, camera on tripod, and took individual images, enlarging each to carefully examine results on the display. With the middle knife in focus, the two knives behind were clearly sharper than the two in front. I used 2.8 aperature to force depth-of-field.
I used the fine tuning menu to move the focal point closer by 2-step increments (favoring front) and continued to test each setting. Not until I reached "+8" was I able to get about equal softness on the first knife and the last in line with the focal point still on the one in the middle.
I then switched lenses to the 50-135 zoom and did the same series of visual test shots, blowing up each one in the display to view them in detail. "+8" worked as well with this lens as the 200mm.
Switching to the Sigma 17-70 zoom, I repeated the above with the same results. "+8" works on this lens also.
I also used the "selective" focus setting in addition to the "center" setting for all of the above and found that this setting seemed to move the focal point 1-knife closer when the red pipper was set for the center knife. When the pipper was moved to the bottom (closest) focal choice (the first knife in the lineup of 5) it was more in-focus, but still definitely still softer than the next in line. I'm leaving the setting of "+8" "for ALL lenses" and will shoot some more images this evening to double check these settings in real shooting situations.
My question: Is it typical of the K-5 to need this much "fine tuning" to get the results the camera is supposed to be capable of? Does this signify a need for warranty service? Are others experiencing a similar problem with K-5 auto-focus?
And by the way, the lens button fell off, also.
grollands38
Last edited by grollands38; 09-02-2011 at 03:33 PM.
Reason: additions/corrects/better grammar