Nikon D300 User Manual page 106

f7" Customize Command Dials
This option controls the operation of the main and sub-command
dials.
Description
Controls the direction of the command dials. Choose [No]
Reverse (the default option) for normal command dial operation, or
rotation [Yes] to reverse the rotation of the command dials. This
setting also applies to the command dials for the MB-DIO.
At the default setting of [Off], the main command dial
controls shutter speed and the sub-command dial controls
aperture. If [On] is selected, the main command dial will
control aperture and the sub-command dial shutter speed.
This setting also applies to the command dials for the MB-
DIO.
At the default setting of [Sub-command dial], aperture can
only be adjusted with the sub-command dial (or with the
main command dial if [On] is selected for [Change main/
sub]). If [Aperture ring] is selected, aperture can only be
adjusted with the lens aperture ring and the camera aperture
display will show aperture in increments of 1 EV (aperture for
type G lenses is still set using the sub-command dial). Live
view is not available when [Aperture ring] is selected and a
CPU lens with an aperture ring is attached. Note that
regardless of the setting chosen, the aperture ring must be
used to adjust aperture when a non-CPU lens is attached.
Change
main/sub
Aperture
setting
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