I purchased a 50-135 a little over a month ago. It was packaged badly, and the hood was broken. There were other problems so I sent it back and received a new one.
I may be having problems with this one as well. Almost every picture is soft at the focus point. I've done numerous tests with newspapers and charts, and the spot focus point is always soft. I hand focus, then auto focus and the focus indicators move about 75% of the time, usually around 2 inches as best I can tell. I tried to adjust my k7 to see if I could align it, but nothing changed. I tried 'All' lenses and 'one' lens adjustments. It didn't make any difference. I feel like my camera might be the problem as I should see some movement on the focus point when adjusted.
Anyway, I thought since it was back focusing most of the time I could live with that since I shoot pictures mostly of faces, and would normally have the aperture at or above 4.0 which would get the face in focus due to the greater DOF. I'm seeing most of my kids faces a little soft at the point of focus (usually their nose). Does anyone else have this problem? I don't want to return this lens because even though I have had fun getting some nice old (and new) lenses, and the kit lens and 55-300 are great, this lens is astonishing to me. Mostly because of the color and OOF areas. I can't stop taking pictures. It seems pretty sharp, but it doesn't seem to be twice as sharp as my kit lens or other nice lenses, but it IS at least twice as nice with the color and bokeh.
I'm going to try to post a picture here. If it works, I used spot focus on the yellow part of the flower and recomposed slightly. Please take a look at this and see if you can spot my problem.
Also, my manual focus has a slight amount of play in it when reversing directions. Is this normal for this lens?
Thanks