Pentax ZX-L ZX-L Manual - Page 79

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SNOI1VU3dO 033NVA0V ABOUT FOCUSING t on HARD-TO-AUTOFOCUS SUBJECTS The autofocus system is highly precise, but not perfect. Depending on the brightness, contrast, shape, and size of your subject, the autofocus system may not operate. In this situation, use the focus -lock technique (r p.80) or set the focus mode switch to [MF] and use the manual focus mode to focus the lens on the subject with the aid of the matte field in the viewfinder ( Wp.79). Subjects which may fool the autofocus system include: • Extremely low-contrast subjects such as a white wall in the autofocus frame. • Subjects which don't reflect much light in the autofocus frame. • Subjects with complex or detailed patterns. • Subjects which are moving too fast. • Multiple subjects in the foreground and background of the autofocus frame. • Subjects positioned against reflected light or strong backlight or with extremely bright backgrounds. :Memo ■ Notes on accessories The following conditions do not allow autofocusing or manual focusing with the focus indicator in the viewfinder. Use the manual focus mode to focus on the subject with the aid of the matte field surrounding the autofocus frame. Wp.79 • When using Stereo Adapter. • When using Extension Tubes or an Auto Bellows for close-up photogra- phy. • When using an ordinary polarizing filter; the half mirror incorporated into the autofocus system reduces the effectiveness of the autofocus function when used in combination with an ordinary polarizing filter. Use a CIRCULAR POLARIZING FILTER for proper autofocus operation. • Note on the SMC Pentax SOFT 85mm/f2.8lens When shooting at a distance closer than approx.1.5nn(4.9ft), set the lens to a manual f-stop setting between f/2.8 and f/4.5. A smaller aperture (f/5.6 to f/32) may cause the autofocus system and the viewfinder's focus indicator to malfunction. To remedy this problem, temporarily set the lens to f/4.5. After focusing on the subject, lock focus, and set the lens to the required f-stop.

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ABOUT
FOCUSING
t
on
HARD-TO-AUTOFOCUS
SUBJECTS
The
autofocus
system
is
highly
precise,
but
not
perfect.
Depending
on
the
brightness,
contrast,
shape,
and
size
of
your
subject,
the
autofocus
sys-
tem
may
not
operate.
In
this
situation,
use
the
focus
-lock
technique
(r
p.80)
or
set
the
focus
mode
switch
to
[MF]
and
use
the
manual
focus
mode
to
focus
the
lens
on
the
subject
with
the
aid
of
the
matte
field
in
the
viewfinder
(
Wp.79).
Subjects
which
may
fool
the
autofocus
system
include:
•
Extremely
low
-contrast
subjects
such
as
a
white
wall
in
the
autofocus
frame.
•
Subjects
which
don't
reflect
much
light
in
the
autofocus
frame.
•
Subjects
with
complex
or
detailed
patterns.
•
Subjects
which
are
moving
too
fast.
•
Multiple
subjects
in
the
foreground
and
background
of
the
autofocus
frame.
•
Subjects
positioned
against
reflected
light
or
strong
backlight
or
with
extremely
bright
backgrounds.
:Memo
■
Notes
on
accessories
The
following
conditions
do
not
allow
autofocusing
or
manual
focusing
with
the
focus
indicator
in
the
viewfinder.
Use
the
manual
focus
mode
to
focus
on
the
subject
with
the
aid
of
the
matte
field
surrounding
the
autofocus
frame.
Wp.79
•
When
using
Stereo
Adapter.
•
When
using
Extension
Tubes
or
an
Auto
Bellows
for
close-up
photogra-
phy.
•
When
using
an
ordinary
polarizing
filter;
the
half
mirror
incorporated
into
the
autofocus
system
reduces
the
effectiveness
of
the
autofocus
function
when
used
in
combination
with
an
ordinary
polarizing
filter.
Use
a
CIRCULAR
POLARIZING
FILTER
for
proper
autofocus
opera-
tion.
•
Note
on
the
SMC
Pentax
SOFT
85mm/f2.8lens
When
shooting
at
a
distance
closer
than
approx.1.5nn(4.9ft),
set
the
lens
to
a
manual
f-stop
setting
between
f/2.8
and
f/4.5.
A
smaller
aperture
(f/5.6
to
f/32)
may
cause
the
autofocus
system
and
the
viewfinder's
focus
indicator
to
malfunction.
To
remedy
this
problem,
temporarily
set
the
lens
to
f/4.5.
After
focusing
on
the
subject,
lock
focus,
and
set
the
lens
to
the
required
f-stop.
SNOI1VU3dO
033NVA0V