Nikon D90 - Manual (Page 221)

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L
f5: Customize Command Dials
This option (available in all shooting modes) controls the operation of the main and
sub-command dials.
f6: No Memory Card?
If Release locked (the default setting) is selected, the shutter-release button is only
enabled when a memory card is inserted in the camera. Selecting Enable release
allows the shutter to be released when no memory card is inserted, although no
pictures will be recorded (they will however be displayed in the monitor in demo
mode). Note that when photographs are being captured to a computer using
Camera Control Pro 2 (available separately), photographs are not recorded to the
camera memory card and the shutter will be enabled regardless of the setting
chosen for this option. This option is available in all shooting modes.
f7: Reverse Indicators
At the default setting of ( V), the exposure indicators in the viewfinder
and shooting information display are displayed with positive values on the left and
negative values on the right. Select
( W) to display negative values on
the left and positive values on the right. This option is available in all shooting
modes.
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-D80.
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-D80.
Menus
and
playback
At the default setting of On, 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
2 or J. On (image review excluded) is the same as On except
that the command dials can not be used during image review. If Off is selected,
the multi selector is used to choose the picture displayed during full-frame
playback, highlight thumbnails, and navigate menus.