The Inside Track - Nikon D3s Technical Manual

Choose longer lock-on times when photographing a run-
ner on the inside track or in other situations in which your
subject may be blocked for relatively long periods.
AF-C priority
selection: Release

The Inside Track

Dynamic AF area:
9 points or 21 points
Focusing with Autofocus
Your subject
Focus tracking with
lock-on: 5 (Long)
9