Nikon N90 AF - Auto Focus with Main Subject

AUTOFOCUS WITH MAIN SUBJECT OFF CENTER
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• If there is substantial difference of brightness between
subject and background, switch to Center-Weighted or
Spot Metering and use AE-L lever. See pages 88 to 89.
• With a moving subject, focus cannot be locked.
In Single Servo AF mode
As previously noted, in Single Servo autofocus, focus is locked
as long as the shutter release button is kept lightly pressed.
Use this feature for off-center subjects.
In the following
procedure, Spot-Area AF demonstration photos are used.
1. Position focus brackets on subject and lightly press shutter
release button to start autofocus operation.