Nikon D90 - Manual (Page 109)

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A Adjusting Shutter Speed and Aperture
While exposure lock is in effect, the following settings can be adjusted without altering the
metered value for exposure:
The new values can be confirmed in the viewfinder and control panel. Note that the metering
method can not be changed while exposure lock is in effect (changes to metering take effect
when the lock is released).
A See Also
If On is selected for Custom Setting c1 (Shutter-release button AE-L, pg. 179), exposure will
lock when the shutter-release button is pressed halfway. For information on changing the role
of the AE-L/AF-L button, see Custom Setting f4 (Assign AE-L/AF-L button, pg. 200).
Mode Setting
Programmed auto Shutter speed and aperture (flexible program; pg. 80)
Shutter-priority auto Shutter speed
Aperture-priority auto Aperture