Nikon F4 User Manual
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In the S (Single Servo Autofocus) mode, the shutter can be
released only when the in-focus indicator LED appears; once
the LED appears, focus is locked as long as the shutter release
button is lightly pressed,
If the subject moves and the focusing distance changes,
refocus by briefly removing finger from shutter release button
and lightly pressing again to reactivate autofocus operation, or
use Continuous Servo Autofocus mode or Focus Tracking. See
pages 35 and 37.