Originally posted by JeffJS Sorry folks but the D90 clearly nailed the shots.
Are you arguing a point? I don't recall anyone saying the D90 failed in any way. Maybe I'm misunderstanding your statement.
Anyway, the 18-55, although not a bad lens in any regard, is naturally not in league with a DA* or Canon-L or Nikon equivalent. Regardless, the 18-55 kit lens is NOT *THAT* bad.
The problem exhibited here is not a lens quality issue -- other than perhaps a broken lens (or pair of lenses).
Honestly, we don't have enough information to make a good determination.
I would suggest that the OP get out the tripod and take some 'lab' style tests.
Get a baseline with;
- consistent lighting (no passing clouds causing images to have vastly different requirements as are displayed in the first examples),
- static subject. Not one that might move (although this focus problem is more than slight movement)
We also do not know for certain that the focus was in fact locked, or if so; where.
We do not know for certain that the SR was enabled. (On that note, I recently scanned my past 20,000 photos... it seems nearly 40% did not have SR lock although SR was enabled -- and explains the quality of most of them. I would have sworn this number should have been more around 2%... obviously I was wrong. The OP might be as well. :-) )
It would be helpful if the OP could post the original image or run EXIFTOOL or PHOTOME to verify and validate the state of the camera and it settings.