Nikon 25446B D90 User's Manual - Page 108
Autoexposure Lock (P, S, and A Modes Only), Select center-weighted or spot, metering., Lock exposure.
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Autoexposure Lock (P, S, and A Modes Only) Use auto exposure lock to recompose photographs after metering exposure: 1 Select center-weighted or spot metering. Z button Select mode P, S, or A and choose center-weighted or spot metering (exposure lock has no effect in mode M, while auto and scene modes are not recommended as center- Main command dial weighted and spot metering are not t available). 2 Lock exposure. Position the subject in the selected focus point and press the shutter-release button halfway. With the shutterrelease button pressed halfway and the subject positioned in the focus point, press the AE-L/AF-L button to lock focus and exposure. Shutter-release button While exposure lock is in effect, an AE-L indicator will appear in the viewfinder. AE-L/AF-L button 3 Recompose the photograph. Keeping the AE-L/AF-L button pressed, recompose the photograph and shoot. 88