Nikon D300 User Manual page 80

dl: 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)).
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High Choose thepitchofthebeep ip3 _25 FS.L_-- ] 4,_)H(default) from [High] and [Low]. A J_icon
II_:_JilA IPI
is displayed in the control panel I-IF. _A [Sff_) I
4,_)LLow and shooting information
[_MIL J_A |
displays.
Off Turn the beep speaker off.
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.
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