Pentax ist *ist Manual - Page 103

Hard-to-Autofocus Subjects, Notes on Accessories

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BASIC OPERATION (PREPARATION) BASIC OPERATION (SHOOTING) 101 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 such a case, set the focus mode switch to and use the manual focus mode to focus the lens on the subject with the aid of the matte field in the viewfinder (see pages 94 and 95). Subjects, which may fool the autofocus system, include: a)Extremely low-contrast subjects such as a white wall in the focus points . b)Subjects which don't reflect much light in the focus points . c) Subjects that are moving too fast. d)Multiple subjects in the foreground and background of the focus points . In this case, the subject may not be in focus even if the focus indicator is lit. e)Subjects positioned against reflected light or strong backlight or with extremely bright backgrounds. f) If vertical or horizontal line patterns appear in the focus points . Notes on Accessories If you use any special effect filter, Magic Image Attachment or Stereo Adapter, autofocus and manual focus using the focus indicator in the viewfinder cannot be used. In this case, use manual focus using the viewfinder's matte field. See page 95. ADVANCED OPERATIONS OTHERS

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101
BASIC OPERATION
(PREPARATION)
BASIC OPERATION
(SHOOTING)
ADVANCED OPERATIONS
OTHERS
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 such a case,
set the focus mode switch to
and use the manual focus
mode to focus the lens on the subject with the aid of the matte
field in the viewfinder (see pages 94 and 95).
Subjects, which may fool the autofocus system, include:
a)Extremely low-contrast subjects such as a white wall in the
focus points
.
b)Subjects which don't reflect much light in the focus points
.
c)Subjects that are moving too fast.
d)Multiple subjects in the foreground and background of the
focus points
. In this case, the subject may not be in
focus even if the focus indicator
is lit.
e)Subjects positioned against reflected light or strong backlight
or with extremely bright backgrounds.
f) If vertical or horizontal line patterns appear in the focus
points
.
Notes on Accessories
If you use any special effect filter, Magic Image Attachment or
Stereo Adapter, autofocus and manual focus using the focus
indicator
in the viewfinder cannot be used. In this case, use
manual focus using the viewfinder's matte field. See page 95.