Nikon D3x Manuel D’Utilisation

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U

This option controls the operation of the main and sub-command 
dials.

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 vertical 
shooting.

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. 
If [On (Mode A)] is selected, the main command dial will be 
used to set aperture in exposure mode g only. This setting 
also applies to the command dials for vertical shooting.