Nikon D90 - Autoexposure Lock (P, S, and a Modes Only)

Autoexposure Lock (P, 5, and A Modes Onl~
Use auto exposure lock to recompose photographs after metering exposure:
1 Select center-weighted or spot
metering.
Select mode P, 5, or Aand choose
center-weighted or spot metering
(exposure lock
has no effect in mode
M, while auto and scene modes are
not recommended as center-
weighted and spot metering
are not
available).
:.: button
2 Lock exposure.
Position the subject in the selected focus point and press
the shutter-release button halfway. With the shutter-
release
button pressed halfway and the subject
positioned in the focus point,
press the AE-L/AF-L button to
lock focus and exposure.
While exposure lock
is in effect, an AE-L indicator will
appear in the viewfinder.
Shutter-release
button
AE-UAF-L button
88
3 Recompose the photograph.
Keeping the AE-L/AF-L button pressed, recompose the photograph and shoot.