Pentax ME-F ME-F Manual - Page 40

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• • 36 On some occasions you will have to focus manually While your auto focus system is extremely accurate, there will be occasions when you will have to focus manually. When this occurs, both LED arrows will light (or flash depending on lighting conditions), informing you to focus in the conventional manner as indicated on page 38. These situations arise mainly when lighting is insufficient or contrast is too flat for the sensor to read the subject. Examples include photographing indoors in dimly lit room, outdoors at dawn, twilight or in heavy shade or overcast. (EV 4, at ASA 100,1 sec. at f/4). Subjects without contrast, such as a white wall also present a problem, as do excessively bright subjects, strong backlighting, fast moving subjects, very fine patterns or lines and subjects with extreme contrast (over EV 16 at ASA 100,1/125 sec. at f/22). Note: Even with subjects lacking contrast, the system can sometimes be made to work if some mark or distinguishing feature of the subject can be placed in the center spot of the viewfinder, such as the bicycle tire in the top photo. When both LEDs light continuously, you must focus manually. Lighting or contrast is insufficent for Electronic Focus.

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36
On
some
occasions
you
will
have
to
focus
manually
While
your
auto
focus
system
is
extremely
accurate,
there
will
be
occasions
when
you
will
have
to
focus
manually.
When
this
occurs,
both
LED
arrows
will
light
(or
flash
depending
on
lighting
conditions),
informing
you
to
focus
in
the
conventional
manner
as
indicated
on
page
38.
These
situations
arise
mainly
when
lighting
is
insufficient
or
contrast
is
too
flat
for
the
sensor
to
read
the
subject.
Examples
include
photographing
indoors
in
dimly
lit
room,
outdoors
at
dawn,
twilight
or
in
heavy
shade
or
overcast.
(EV
4,
at
ASA
100,1
sec.
at
f/4).
Subjects
without
contrast,
such
as
a
white
wall
also
present
a
problem,
as
do
excessively
bright
subjects,
strong
backlighting,
fast
moving
subjects,
very
fine
patterns
or
lines
and
subjects
with
extreme
contrast
(over
EV
16
at
ASA
100,1/125
sec.
at
f/22).
Note:
Even
with
subjects
lacking
contrast,
the
system
can
sometimes
be
made
to
work
if
some
mark
or
distinguishing
feature
of
the
subject
can
be
placed
in
the
center
spot
of
the
viewfinder,
such
as
the
bicycle
tire
in
the
top
photo.
When
both
LEDs
light
continuously,
you
must
focus
manually.
Lighting
or
contrast
is
insufficent
for
Electronic
Focus.