Nikon COOLPIX P310 Reference Manual page 70

The Movie Menu
Autofocus Mode
Display the shooting screen _' MENU button -'_ _ (Movie) tab (_] 11 )
_' Autofocus mode
Choose how the camera focuses when recording normal speed movies (_65).
Option Description
AF-S Single AF Lock on the focus when the • (_l_I movie-record) button is pressed
(default to start recording. Select this option when the distance between the
setting) camera and the subject remains fairly consistent.
The camera focuses continuously during movie recording.
Suitable for shooting when the distance between the camera and
AF-F
Full-time AF subject changes. The operation sound of when the camera focuses
may be recorded. Setting to Single AF is recommended if the sound
is noticeable.
_69