Olympus IS-1 - Manual (Page 57)

Subjects that are difficult to focus
Although the IS-1 can focus on almost any
subject, there are certain conditions, such as those
shown in the illustrations, where it may not be
possible to obtain correct focus. In such cases, the
autofocus indicator in the viewfinder will blink to
warn you. When the autofocus indicator blinks,
try using the power focus (p. 47), or try using
focus lock by focusing on a different subject at
the same distance.
Please be careful in situations (4), (5) and (6),
as the autofocus indicator in the viewfinder may
light even though the lens is incorrectly focused.
(1) Subject that does not include
vertical lines
(2)Subject with low contrast (3)A rapidly moving subject
(4)Two subjects within the focusing
frame, at different distances
(5)Subjects in Excessively bright light (6)A subject with a repeated pattern
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