Nikon P510 - Manual (Page 198)

E 68
The Movie Menu
Re
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Autofocus Mode
Choose how the camera focuses when recording normal speed movies ( E64).
Display the shooting screen M d button M e (Movie) tab (A13) M Autofocus
mode
Option Description
A Single AF
(default
setting)
Lock on the focus when the b (e movie-record) button is pressed
to start recording. Select this option when the distance between the
camera and the subject remains fairly consistent.
B Full-time AF
The camera focuses continuously during movie recording.
Suitable for shooting when the distance of between the camera and
subject changes. The operation sound when the camera focuses may
be recorded. Setting to Single AF is recommended if the sound is
noticeable.