Nikon P7800 - Manual (Page 181)

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E 53
Autofocus Mode
Select how the camera focuses when shooting still images.
B
Notes About Autofocus Mode
The setting may not be changed when using certain settings of other functions.
C
Autofocus Mode for Movie Recording
Autofocus mode for movie recording can be set with Autofocus mode ( E71) in
the movie menu or movie custom setting menu.
Rotate the mode dial to A, B, C, D, E, F or N M d button M A,
B, C or D tab (A13) M Autofocus mode
Option Description
A
Single AF
(default setting) The camera focuses only when the shutter-release
button is pressed halfway.
B Full-time AF
The camera continues focusing even when the
shutter-release button is not pressed halfway. The
sound of lens drive movement is heard while the
camera focuses.