Nikon D6 Reference Manual page 203

❚❚ Live View Photography and Filming
Option
AF-S [Single AF]
AF-F [Full-time AF]
Use with stationary subjects. Focus locks while
the shutter-release button is pressed halfway.
Use with moving subjects. The camera adjusts
focus continuously in response to subject
motion until the shutter-release button is
pressed halfway. Focus locks when the shutter-
release button is pressed halfway.
Choosing How the Camera Focuses (Focus)
Description
151