Nikon N90 AF Instruction Manual page 38

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Continuous Servo AF with Release-Priority
Under some conditions, such as very fast action situations, you
may want to take a picture even if focus has not been
successfully accomplished . In such cases , use this mode. Set
focus mode to C to use Continuous Servo AF with Release-
Priority.
In Continuous Servo autofocus mode, as you lightly press the
shutter release button, focus detection begins and the lens
focuses for as long as you keep the shutter release button
lightly pressed . Since the priority is on shutter release, you can
fully depress the shutter release button regardless of focus
status.
38
Stationary subject is in
focus
With a stationary subject: Lightly press the shutter release
button to start autofocus operation . When the subject is in
focus , the camera's autofocus motor (or the built-in motor of an
AF-I Nikkor lens) stops driving the autofocus lens and . lights
up. Unless you remove your finger from the shutter release
button, the motor will start driving the lens again to obtain an
in-focus picture if the focus distance changes.
-4
Subject is located closer than the closest focusing
distance of the lens. Move away from subject and
refocus.
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Appears when TC-16A is used , alerting that the lens
focusing ring is not set at infinity (00). Set focus mode