I bought the 70-200II from Adorama last week after selling the rest of my old gear. I took it to the horse track and found that a lot of my shots were focused on the horse a couple of rows back, not the horse I was focusing on. I assumed that the 5D2 wasn't keeping up with the action as I was used to with the 7D. But I thought I better check the micro adjustment. I taped a magazine page flat to my house and stood about 30 feet away. I used mirror lock up and 2 second delay, and zoomed to 200mm. I tried -10, 0, and +10. -10 was clearly the best. I tried -20 and it was even better. I narrowed it down until I found -16 to be the best. I wasn't too concerned. When at -16, everything seemed perfect. Until I was photographing my daughter and getting close-ups near the minimum focus distance. I kept getting shots with her eyes out of focus. I switched it back to 0 adjustment and everything was perfect. Maybe I need to see if this is happening at every focal length. I'm a bit concerned that I need to send this back soon if I want a different one. Any words of wisdom for me?