Nikon F 4 - Page 37

Focus Tracking
When shooting a moving subject, with the focus mode set to
Continuous Servo Autofocus and the film advance mode to
Low-Speed Continuous (CL), Focus Tracking is automatically
activated to ensure focused images. In Focus Tracking, the
camera analyzes the speed of the moving subject according
to focus detection data, and drives the autofocus lens by
anticipating the position of the subject at the exact moment of
exposure.
1. Set focus mode selector to C, and film advance mode to CL.
2. Position viewfinder focus brackets on subject.