Nikon D300 User Manual (en)

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U
f7: Customize Command Dials
This option controls the operation of the main and sub-command 
dials.
Option
Description
Reverse 
rotation
Controls the direction of the command dials. Choose [No] 
(the default option) for normal command dial operation, or 
[Yes] to reverse the rotation of the command dials. This 
setting also applies to the command dials for the MB-D10.
Change 
main/sub
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-
D10.
Aperture 
setting
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.