Pentax Efina T APS efina T Manual - Page 56

Hard-to-autofocus, Subjects

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HARD-TO-AUTOFOCUS SUBJECTS The autofocus system is highly precise, but not perfect. Some subjects may not focus as you wish. In such a case, use the focus-lock technique on a subject near the actual one and equidistant from the lens. The subjects which may fool autofocus system include: a) Extremely low-contrast subjects such as a white wall or blue sky in the autofocus frame. b) Subjects which don't reflect much light in the autofocus frame. c) Fast moving subjects. d) Subjects with horizontal lines or complex or detailed patterns in the autofocus frame. e) Multiple subjects in foreground of the autofocus frame. f) Subjects positioned against reflected or strong backlight or with extremely bright background. 54

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HARD-TO-AUTOFOCUS
SUBJECTS
The
autofocus
system
is
highly
precise,
but
not
perfect.
Some
subjects
may
not
focus
as
you
wish.
In
such
a
case,
use
the
focus
-lock
technique
on
a
subject
near
the
actual
one
and
equidistant
from
the
lens.
The
subjects
which
may
fool
autofocus
system
include:
54
a)
Extremely
low
-contrast
subjects
such
as
a
white
wall
or
blue
sky
in
the
autofocus
frame.
b)
Subjects
which
don't
reflect
much
light
in
the
autofocus
frame.
c)
Fast
moving
subjects.
d)
Subjects
with
horizontal
lines
or
complex
or
detailed
patterns
in
the
autofocus
frame.
e)
Multiple
subjects
in
foreground
of
the
autofocus
frame.
f)
Subjects
positioned
against
reflected
or
strong backlight
or
with
extremely
bright
background.