Nikon F4 User Manual
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4. Confirm the viewfinder in-focus indicator appears, then fully
depress shutter release button to take an in-focus picture.
• In Single Servo Autofocus, if in-focus indicator LED does
not appear and X appears, shutter locks.
• In Continuous Servo shooting, focusing sharpness
depends on subject speed and direction; autofocus may
not always operate fast enough to follow certain subjects,
so automatic Focus Tracking may be recommended — see