66
AD
V
ANCED OPERA
TIONS
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 [ MF ] and
use the manual focus mode to focus the lens on the sub-
ject with the aid of the matte field in the viewfinder (see
page 65).
Subjects which may fool the autofocus system include:
a) Extremely low-contrast subjects such as a white wall
in the autofocus frame[
].
b) Subjects which don’t reflect much light in the autofo-
cus frame [
].
c) Subjects which are moving too fast.
d) Multiple subjects in the foreground and background of
the autofocus frame [
].
e) Subjects positioned against reflected light or strong
backlight or with extremely bright backgrounds.
Using a Polarizing Filter
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 CIR-
CULAR POLARIZING FILTER for proper autofocus
operation.
Notes on accessories
The following conditions do not allow autofocusing
or manual focusing with the in-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.
a) When using special effect filters or “Magic Image
Attachment” or “Stereo Adapter”.
b) When using Extension Tubes or an Auto Bellows for
close-up photography.
Note on the SMC Pentax F SOFT 85mm f/2.8 lens
When shooting at a distance closer than approx.
1.5m (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 in-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.
• The FA Soft 85mm f/2.8 lens is not required above pro-
cedures.
Summary of Contents for MZ-7 QUARTZ DATE
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