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Special Situations
The
F3AF provides autofocus and focus-aid operation
in
the
majority
or
cases, including such difficult situations
as
fast-
moving sports events, subjects seen through glass, or scenes
containing point light sources, such
as
the flame from a candle
or a streetlight at night. However, if the overall subject
is
dark
in
tone (e.g. when the illumination level
is
less than
EV
4 at ASAI
I
SO
100), low
in
contrast, or lacks a distinct vertical line,
the
focus-impossible warning blinks or glows continuously
to
inform
you
that the camera's
TTL
image displacement detecting
sys
-
tem will not work.
In
this case,
you
can set the lens'
AM
switch
®I
to M and focus
on
the main subject manually using
the
matte
portion of the focusing screen. As
an
alternative, perform auto-
focus or focus-aid operation using another subject, if available,
which
is
located at the same distance
as
the one
you
want
to
photograph; then, with the focus lock button depressed
on
autofocus or without changing the
di
stance setting
in
focus-aid
operation, point the camera at the original subject and take
the picture.
26
Dark subject (llIust_ 1)
The
red X blinks to show insufficient scene brightness.
In
this
case, focus manually, or perform autofocus/focus-aid operation
on
an
alternate subject at the same distance which
is
lighter
in
tone.
Low-contrast subject (lliust. 2), small or finely
detailed subject (lliust. 3)
The
red
X lights
up
continuously.
In
this case, focus manually, or
perform autofocus or focus-aid operation
on
an
alternate sub-
ject at the same distance which
has
more contrast ·or
is
larger.
Subject with no vertical lines (lliust. 4)
The
red
X glows continuously. In this case, turn the camera ver-
tically and perform autofocus or focus-aid operation, or focus
manually; alternatively, perform autofocus or focus-aid oper-
ation using
an
alternate subject at
the
same distance which
has
vertical lines.
Subject with high reflectivity (lliust. 5), backlit
subject (Illust. 6), or scene with both far and near
subjects (Illust. 7)
In
these cases, both
red
arrows or the
red
X light
up
contin-
uou
s
ly.
If
the red X appears, focus manually. If both
red
arrows
are lit, use the matte portion of the screen to check focus.
If
your desired subject
is
out of focus, then focus manually. If it
is
in
focus, take the shot.