Pentax *ist IST DS - Manual (Page 48)

46
3
B
asic Op
er
atio
ns
The autofocus mechanism is not perfect. Focusing may be difficult when
capturing under the following conditions (a to f below). These also apply to
manual focusing using the focus indicator ] in the viewfinder.
If the subject cannot be focused automatically, set the focus mode lever to
\
and use the manual focus mode to focus on the subject with the aid
of the matte field in the viewfinder. (p.122)
(a) Extremely low-contrast subjects such as a white wall in the focus
points range.
(b) Subjects which do not reflect much light within the focus points
range.
(c) Fast moving objects.
(d) Strongly reflected light or strong backlighting (bright background).
(e) If vertical or horizontal line patterns appear within the focus points
range.
(f) Multiple subjects in the foreground and background within the
focus points range.
Hard-to-Autofocus Subjects
Subject may not be focused even when ] (focus indicator) is displayed when
(f) above applies.