#5. "RE: HELP: First day with D800 and already in panic!" In response to In response to 4 Wed 26-Dec-12 01:31 AM by DigitalDarrell
For a moving subject AF-S may not be the best mode, unless it is not moving quickly. I use AF-S most of the time and have few problems with sharpness.
Anyway, I really wasn't suggesting that you use AF-S to shoot pics of a quickly moving child. You were complaining of lack of sharpness. I wanted you to set the camera for a more simple autofocus method to see if it will make sharp pictures. Shoot a picture of a piece of furniture, for instance.
AF-C and using multiple AF points (9, 21, or 51) can take some getting used to. You do need good depth of field, and the D800 has less than the D7000. Stop down and use a flash. Are the shots still not sharp?