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FOCUS------------------------------~
The
Nikon F3AF features a through-the-Iens autofocus system
which takes the guesswork out of focusing : just point the camera
at what
you
want to photograph, depress the shutter release
button @ halfway, and watch the subject literally 3nap into sharp
focus ... automatically.
The
system consists of three parts: the special F3AF camera
body, the
AF
Finder
DX
-1,
and
an
AF
-Nikkor lens, either the
80mm 1/2.8 or the 20
0mm
1/3
.5
IF
-
ED
.
The
AF Finder
DX-1
is
interchangeable and covers approx. 92 % of the image area of
the
actual photograph, meaning that the final photograph will
be
larger than the image seen
in
the viewfinder.
The
focusing
screen
is
built into the bottom of the viewfinder and cannot
be
interchanged. However, when other Nikon
F3
interchangeable
viewfinders are used with
the
F3
AF
,
you
have a choice of 20
interchangeable focusing screens (refer to page
55).
Nikon's autofocus system
is
unique
in
that
it
features exception-
ally quick response, allowing
you
to keep
up
with active, fast-
moving subjects.
The
Nikon F3AF offers
you
three different ways of focusing:
1)
autofocus, 2) focus
-a
id
operation (using the focus indicators
inside the finder), or
3)
manual focus (using the matte portion of
the focusing screen).
As
shown
in
the following table, however,
only AF-Nikkor lenses are usable for autofocus. With other lenses
having maximum apertures of
1/3
.5
and faster,
you
can
use
the
focus indicators
as
a guide
in
focusing
as
you
manually rotate
the lens focusing ring (
Note: Because
of
the cropping which
occur
s
in
the case
of
mounted
slides
or
regular snapshot
-s
ize
prints, the actual picture might come out
slightly smaller than the image seen
in
the viewfinder.
20
Usable Lenses
Focusing method
Lens
Autofocus
AF-Nikkor
80mm
f/2.8, AF-Nikkor 200mm f/3.5
IF-EO
Focus
-ai
d operation Nikkor (including AF-Nikkorl and Nikon Series
E lenses with a maximum aperture of f/3.5
or faster
Manual focus
Nikkor (including
AF
-Nikkor) and Nikon Series
Elenses
Notes:
1)
Even
with lenses slower than fI3.5, the focus indicators
willligM
up
when the shutter release button
is
depressed halfway.
This
indication,
however,
is
not reliable.
2)
Although the following Nikkor lenses have a maximum aperture
of
f13
.5
or faster, they cannot be used for focus-aid operation: 16mm fI3.5,
20mm fI3.5, 28mm fI3.5, 135mm fI3.5, Micro 55mm fI3.5,
PC
28mm
fI3.
5,
PC
35mm
fI2.
8,
and
PC
35mm
fI3.5; the Micro-Nikkor 55mm
f12
.8 cannot be used
at
closer than 280mm; the Zoom-Nikkor 35-
105mm fI3.5-fI4.5 can be used only
at
35mm zoom setting.
3)
When
the Nikon Teleconverter
TC
-
14
, 200 or 300
is
attached to the lens
and it makes the lens' effective aperture slower than
fI3
.5, the
camera's autofocus and focus-aid operation cannot be used.
4)
The
following lenses cannot be mounted on the F3AF with the
OX
-1
Finder: . Nikkor 13mm fI5.6, Reflex-Nikkor 500mm
f18,
and Reflex-
Nikkor 1000mm
fill
.
5)
Certain filters cannot be used for autofocuslfocus-aid operation. (For
details, please refer to page
64)