Nikon N70 AF Instruction Manual page 34

A F-C
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.
In Continuous Servo autofocus mode, as you lightly press
shutter release button, focus detection begins and the lens
focuses for as long as you keep shutter release button lightly
pressed . Since the priority is on shutter release, you can fully
depress shutter release button regardless of focus status.
34
Stationary subject is in
focus
W ith a stationary subject: Lightly press 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-S/AF-I
Nikkor lens) stops driving the autofocus lens and . lights up.
Unless you remove your finger from shutter release button, the
motor will start driving the lens again to obtain an in-focus
picture It the subject moves.
If. appears in the viewfinder
Subject is located closer than the closest focusing distance
of the lens. Move away from subject and refocus.