Nikon COOLPIX P510 Reference Manual

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The Movie Menu
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Autofocus Mode
Choose how the camera focuses when recording normal speed movies (
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.