Nikon D300 User Manual (en)

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268
U
a2: AF-S Priority Selection
This option controls whether 
photographs can be taken only 
when the camera is in focus (focus 
priority
) or whenever the shutter-
release button is pressed (release 
priority
) in single-servo AF. To 
select single-servo AF, rotate the 
focus mode selector to S.
Regardless of the option selected, focus will lock while the in-focus 
indicator (
I
) is displayed.
Option
Description
Release
Photos can be taken whenever the shutter-release 
button is pressed.
F
Focus 
(default)
Photos can only be taken when the in-focus indicator 
(
I) is displayed.
Focus mode selector