Nikon N90 AF Instruction Manual page 36

High-performance camera
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Single Servo AF with Focus-Priority
For Single Servo AF with Focus-Priority, set the focus mode to
S.
You lightly press the shutter release button, the lens starts
adjusting
for
focus.
Because
the p'riority is on correct focus,
the
shutter cannot be released until the subject is in focus. After
focus is achieved, the focus remains locked for as long as the
shutter release button is
lightly
pressed. This feature is useful,
especially when recomposing the picture with the mains
subject off center.
However,
if the camera-to-subject distance
changes, you have to refocus.
36
Stationary subject
is in
focus
With a stationary
subject:
Lightly press the shutter release
button. When the subject is in focus, the lens stops moving, the
in-focus indication
.
appears in the viewfinder, and focus is
locked. If the subject moves, remove your finger from the
shutter release button,
then lightly press it
again to
re-start
autofocus.
When a stationary subject comes into focus, a double beep
sounds (if set).
4
Subject is located closer than the closest focusing
distance of the lens. Move away from subject and
refocus.
Appears when TC-16A is used, alerting that the lens
focusing ring
is not
set at infinity (00). Set focus mode
selector to
M,
set lens focusing
ring
to 00, set focus
mode selector to S again, then refocus.

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