Pentax SF-1 SF-1 Manual - Page 37

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Difficult Subjects for Auto Focusing This camera's auto-focusing system is extremely precise and highly sophisticated, yet there are certain types of subjects (due to their brightness, contrast, shape and size) that make focusing very difficult. For these situations, use the focus lock or manual focusing, or take advantage of the built-in RTF (Retractable TTL-Auto Flash) in dark locations. • Extremely low-contrast subjects (little difference between the bright and dark areas), such as a white wall. • Extremely dark subjects. • Extremely fast-moving subjects. • Subjects with only horizontal lines. • Subjects with detailed and/or complex patterns. • Subjects positioned against harsh reflected light, strong backlight or an extremely bright background. • Subjects composed of elements both near and far within the focus frame. Accessories Not Usable in Auto Focusing The following accessories cannot be used in the autofocus mode or the Fl (Focus Indication) system. Use the matte area of the viewfinder for focusing. • Special-effect filters, magic-image attachments or stereo adapters. • Linear polarizing filters because this camera has a halfmirror. Use the circular polarizing filters. • Extension Tubes and Auto Bellows. ti C) C 33•

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Difficult
Subjects
for
Auto
Focusing
This
camera's
auto
-focusing
system
is
extremely
precise
and
highly
sophisticated,
yet
there
are
certain
types
of
subjects
(due
to
their
brightness,
contrast,
shape
and
size)
that
make
focusing
very
difficult.
For
these
situations,
use
the
focus
lock
or
manual
focusing,
or
take
advantage
of
the
built-in
RTF
(Retractable
TTL-Auto
Flash)
in
dark
locations.
•
Extremely
low
-contrast
subjects
(little
difference
between
the
bright
and
dark
areas),
such
as
a
white
wall.
•
Extremely
dark
subjects.
•
Extremely
fast-moving
subjects.
•
Subjects
with
only
horizontal
lines.
•
Subjects
with
detailed
and/or
complex
patterns.
•
Subjects
positioned
against
harsh
reflected
light,
strong
backlight
or
an
extremely
bright
background.
•
Subjects
composed
of
elements
both
near
and
far
within
the
focus
frame.
C)
Accessories
Not
Usable
in
Auto
Focusing
The
following
accessories
cannot
be
used
in
the
auto
-
focus
mode
or
the
Fl
(Focus
Indication)
system.
Use
the
matte
area
of
the
viewfinder
for
focusing.
•
Special
-effect
filters,
magic
-image
attachments
or
stereo
adapters.
•
Linear
polarizing
filters
because
this
camera
has
a
half
-
mirror.
Use
the
circular
polarizing
filters.
•
Extension
Tubes
and
Auto
Bellows.
C
ti
33•