Nikon D300 - Manual (Page 307)

281
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.
z Low
Off Turn the beep speaker off.
Option Description
On On-demand grid lines displayed.
Off (default) On-demand grid lines not displayed.