Nikon Camera F3AF User Manual Page 22

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Page view 21
-FOCUS-continued-----------------
Autofocus
With the lens
A-M
switch ® set
at
A, depressing the shutter re-
lease button halfway turns
on
the camera's autofocus control
(as well
as
the exposure meter}.
At
the same time,
ei
ther 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)
shou
ld
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
(
<III
)
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
22
function well with the particular subject or shooting situation
(plea
se
refer to page
26
for further details).
No
t
es
:
1)
After taking a picture during autofocus operation, the lens will continue
to
focus for
16
sec. after you remove pressure from the shutter release
button.
To
stop the lens movement
at
any time to conserve battery
power, slide the A-M switch to
M.
Immediately lens movement stops,
but the red arrow(s) or red
X remain
on
for
16
sec. until switched
off
automatically.
2)
While shooting fast-moving subjects, one or both
of
the red arrows
may blink to show that the image is quite close to the
in
-focus zone;
for ordinary snapshots, taking the shot even in this situation can pro-
duce satisfactory results. However,
if
sharp focus is mandatory, wait
until both red arrows light up continuously.
3)
When
the batteries
in
the viewfinder are nearly exhausted, autofocus
becomes slow or may even stop, even though the red arrow(s) or red X
remain lit. In this
case
, replace the batteries
in
the finder
at
your earliest
convenience,
or
set the A-M switch to M and turn the focusing ring
manually using the red arrows
as
a guide.
Page view 21
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