Olympus E-1 - Manual (Page 48)

F
ocus
48
Subjects that are difficult to focus on
4
The AF confirmation mark blinks. The
subject cannot be brought into focus. The AF mark stays lit, but the subject
cannot be brought into focus.
Under the following conditions, AF may not work properly. Take a picture using focus
lock (P. 49), manual focus (P. 54), or by selecting an AF frame (P. 50).
Subject with low
contrast
Subject with an
extremely bright
area in the
frame
Subject with
repeated
patterns
Fast-moving
subject
The subject is
not positioned
within the AF
frames.
Subjects at
different
distances