Nikon D300 User Manual page 107

Option
Menus
and
playback
Description
At the default setting of [Off], the multi selector is used to
choose the picture displayed during full-frame playback,
highlight thumbnails, and navigate menus. If [On] is selected,
the main command dial can be used to choose the picture
displayed during full-frame playback, move the cursor left or
right during thumbnail playback, and move the menu
highlight bar up or down. The sub-command dial is used to
display additional photo information in full-frame playback
and to move the cursor up or down during thumbnail
playback. While menus are displayed, rotating the sub-
command dial right displays the sub-menu for the selected
option, while rotating it left displays the previous menu. To
make a selection, press I_, the center of the multi selector, or
@.
@
f8: Release Button to Use Dial
This option allows adjustments that are normally made by holding
a button and rotating a command dial to be made by rotating the
command dial after the button is released. At the default setting
of [No], the button must be pressed while the command dial is
rotated. If [Yes] is selected, the setting can be changed by rotating
the command dial after the button is released. Setting ends when
the button is pressed again, the shutter-release button is pressed
halfway, or any of the MODE,[], _, IS0, QUAL,or WB button is pressed.
Except when [No limit] is selected for Custom Setting c2 [Auto
meter-off delay] or an optional EH-5a or EH-5 AC adapter is used,
setting will also end when the exposure meters turn off.
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