Nikon Camera F3AF - Manual (Page 31)

FOCUS —continued-
Autofocus
With the lens A-M switch © set at A, depressing the shutter re-
iease button haifway turns on the camera’s autofocus controi
(as well as the exposure meter). At the same time, either the
focus indicator(s) or the focus-impossible warning in the view­
finder light up and the lens begins to focus automatically. Note
that the main subject (if possible, a subject's vertical line)
should be centered inside the central focusing frame in the
viewfinder. Autofocus continues for 16 sec. even after you
remove your finger from the button. When the subject is in
focus, focusing stops and both red arrows light up.
If there is a big difference between the actual camera-to-subject
distance and setting on the lens distance scale #, the red X
lights up momentarily but disappears as soon as focusing begins.
If the subject is closer than the closest distance to which the
lens can focus, either the far-focus arrow (-4) or the red X lights
up continuously. However, when the red X blinks or lights up
continuously, this indicates that the autofocus system does not
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