I have 2 K-r units in my possession. The first showed front focus problems and the second is a unit in exchanged for the first one. Serial numbers are 40 units apart (second with a lower number than the first). I also have a K100D Super. All test shots are taken with an FA50 at f/1.4, aperture priority mode, tripod, no SR, tungsten light overhead, tungsten WB, 2 second timer.
Here is the focus test image from the second unit with 0 focus adjustment:
Here is the the same unit with -10 focus adjustment:
Here is the K100D Super:
Am I correct in the following conclusions - (1) the second unit has a front focus problem; (2) the -10 adjustment is close but not sufficient; and (3) K100D Super also needs calibration?
Finally, how will Canikons do under similar conditions (specifically interested in D3100 / D7000 / T2i / 60D)?
Thanks!