Nikon D3 - Manual (Page 13)

13
Focusing with Autofocus
The Inside Track
Example 3
Choose longer lock-on times when photographing a runner
on the inside track or in other situations in which your subject
may be blocked for relatively long periods.
Your subject
AF-C priority selection:
Release Dynamic AF area:
9 points or 21 points Focus tracking with
lock-on: Long