Nikon S51c - Manual (Page 81)

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The Movie Menu
Mo
vi
es
Auto-Focus Mode
Choose how the camera focuses in movie mode.
k
Movie File Names and Folder Names
See “Image/Sound File and Folder Names” (c 151).
Option Description
Z Single AF
(default setting)
Camera focuses when shutter-release button is pressed
halfway and locks at this position during shooting.
a Full-time AF
Camera focuses continuously until focus is acquired and
locked.
To prevent sound of camera focusing from interfering with
recording, use of [Single AF] is recommended.