I don't know how I didn't see this earlier but my 16-50 is way off kilter. Severely soft (OOF) on the left side. After noticing the trouble with the kids' golf camp photo I went home and took a series of shots at 16mm and 50mm for f/2.8, f/4.0, f/8.0 and f/16. No PP, just converted to JPG with ACR.
All the examples can be found on this page:
john faith (jdfaith) : photos : 2004 Athletics- powered by SmugMug 
