I finally received my d7k last night and man! i am excited!
Now i have an AF question, my understanding is d7k is capable of tracking moving object relative well, and i am trying to make it focus on my 11 month old son's eye with a 85/1.8 lens wide open while he moves around . My test did not go well, i selected AF-F and 3d tracking and used one single focusing point, but it turned out that most of the photos are out of focus. The eyes are not sharp at all.
What did i do wrong?