Nikon D4 - Manual (Page 48)

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Focus Tracking with Lock-On
By preventing the camera from refocusing when your sub-
ject is briefl y obscured by another object, focus tracking
with lock-on ensures that the camera will continue to track
the main subject once the obstacle has moved away (con-
tinuous-servo AF only). Choose the length of time before
the camera refocuses from 5 (Long), 4, 3 (Normal), 2, and
1 (Short). To refocus before lock-on ends, press the
B or
shutter-release button again.
Camera will wait before
refocusing on objects behind
the subject
Camera will track and focus on
objects the same distance from
the camera as the subject
Camera will wait before
refocusing on objects in front of
the subject
Note: Turn lock-on off for im-
proved response when you
need to switch rapidly from
one subject to another and in
other similar situations.
● ●
Taking Photographs