Nikon S9700 - Manual (Page 186)

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Autofocus Mode
Set how the camera focuses in movie mode.
• When an HS movie option is selected in Movie options, the setting is fixed
at Single AF.
Enter shooting mode M d button M D menu icon M Autofocus mode
M k button
Option Description
A Single AF
(default setting)
Focus is locked when the b (e movie-record) button is
pressed to start recording.
Select this option when the distance between the camera
and the subject will remain fairly consistent.
B Full-time AF
Camera focuses continuously.
Select this option when the distance between the camera
and subject will change significantly during recording. The
sound of the camera focusing may be heard in the
recorded movie. Use of Single AF is recommended to
prevent the sound of the camera focusing from interfering
with recording.