Pitcher Or Runner; Tances From The Camera - Nikon D3body - D3 Body 12mp FX Digital SLR Camera Technical Manual

Autofocus
Example 2
Choose lower lock-on times for improved focus response
when you may have to switch quickly between subjects at
diff erent distances from the camera.
AF-C priority selection:
Release
12

Pitcher or Runner?

Dynamic AF area:
9 points or 21 points
Focus tracking with
lock-on: Short or Off
(note that Off reduces
eff ectiveness of dy-
namic-area AF)