Nikon F70 Instruction Manual page 18

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.
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Stationary subject is in
focus
With 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 if 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.
Moving subject is
expected to be in focus
With a moving subject: Lightly press shutter release button
and Focus Tracking is automatically activated. Confirm
appears in the viewfinder, then fully depress shutter release
button.
Focus Tracking remains activated as long as you keep lightly
pressing shutter release button. When the subject stops, the
viewfinder shows .
If blinks in the viewfinder:
Autofocus is not possible (see page 38).
• As focus is not locked in Continuous Servo AF, to take
an off-centre subject, select Single Servo AF. (Pages
36 to 37).
• With a moving subject, depending on subject status
and lens in use, slightly out-of-focus pictures may
result.
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