Nikon D3S User Manual page 349

Option
If Sub-command dial is selected, 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
Aperture
show aperture in increments of 1 EV (aperture for type G lenses
setting
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.
If Off is selected, 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
Menus thumbnail playback, and move the menu highlight bar up or
and down. The sub-command dial is used to display additional
playback 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 2, the
center of the multi selector, or J.
D
Live View
When using a CPU lens equipped with an aperture ring in live view,
select Sub-command dial for Aperture setting.
Description
U
323