Nikon D90 - Manual (Page 203)

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d8: Shooting Info Display
At the default setting of v Auto, the color of the lettering in the information
display (pg. 10) will automatically change from black to white or white to black in
response to ambient lighting conditions. To always use the same color lettering,
select Manual and choose
w Dark on light (black lettering) or x Light on dark
(white lettering). Monitor brightness will automatically be adjusted for maximum
contrast with the selected text color.
This option is available in all shooting modes.
d9: LCD Illumination
At the default setting of Off, the control panel backlight (LCD illuminator) will only
light while the power switch is in the
D position. If On is selected, the control panel
will be illuminated while the exposure meters are active (pg. 35). Select Off for
increased battery life.
This option is available in all shooting modes.
d10: Exposure Delay Mode
At the default setting of Off, shutter is released when the shutter-release button is
pressed. In situations where the slightest camera movement can blur pictures, On
can be selected to delay shutter release until about 1 s after the shutter-release
button is pressed and the mirror is raised. This option is available in all shooting
modes.
d11: Flash Warning
In P, S, A, and M modes, the flash must be raised manually before use. If On (the default
setting) is selected for this option and lighting is poor, the flash-ready light (
M) will
flicker in the viewfinder when the shutter-release button is pressed halfway to warn
that the built-in flash is required. No warning will be displayed if Off is selected. This
option is available in P, S, A, and M modes only.
Dark on light Light on dark