Subjects That Are Difficult To Focus On - Pentax K 100D Super Operating Manual

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Subjects that are Difficult to Focus on

The autofocus mechanism is not perfect. Focusing may be difficult when
taking pictures 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.133)
(a) Extremely low-contrast subjects such as a white wall in the
focusing area.
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(b) Subjects which do not reflect much light within the focusing area.
(c) Fast moving objects.
(d) Strongly reflected light or strong backlighting (bright background).
(e) If vertical or horizontal line patterns appear within the focusing
area.
(f) Multiple subjects in the foreground and background within the
focusing area.
Subject may not be focused even when ] (focus indicator) is displayed when
(f) above applies.