Nikon D300 User Manual (en)

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U
d1: Beep
Choose [High] or [Low] to sound a beep when the self-timer is 
used or the camera focuses in single-servo autofocus (note that a 
beep will not sound if [Release] is selected for Custom Setting 
a2 ([AF-S priority selection], pg. 268)).
d2: Viewfinder Grid Display
Choose whether on-demand grid lines are displayed in the 
viewfinder (or, in live view mode, in the monitor) for reference 
when composing photographs.
d: Shooting/Display
Option
Description
y
High
(default)
Choose the pitch of the beep 
from [High] and [Low]. A 
c icon 
is displayed in the control panel 
and shooting information 
displays.
Low
Off 
Turn the beep speaker off.
Option
Description
On
On-demand grid lines displayed.
Off (default) On-demand grid lines not displayed.