Nikon N90 AF Instruction Manual page 91

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3. Adjust shutter speed and aperture until electronic analog display shows desired
exposure.
4. Recompose the picture and shoot.
In Single Servo AF mode, if recomposing the picture could
change sUbject-to-camera distance, refocus by briefly
removing your finger from the shutter release button and
lightly pressing it again.
In Continuous Servo AF mode, if recomposing the picture
will not change sUbject-to-camera distance, push and hold
the AF- L button before recomposing .
91