Olympus IR-300 - Manual (Page 23)

If the correct focus cannot be obtained
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Press the shutter button fully.
Under certain types of conditions, the auto focus may not work properly.
In these cases, focus (focus lock) on an object with high contrast at the same
distance as the intended subject, recompose your shot and then take the picture. If
the subject has no vertical lines, hold the camera vertically and focus the camera
using the focus lock function by pressing the shutter button halfway, then return the
camera to the horizontal position while keeping the button pressed halfway and take
the picture.
TIPS
Focus on the subject in the center of the frame.
g“Changing the focusing area (AF MODE)” (P. 48)
Subjects that are difficult to focus on
Shutter button
The green lamp blinks.
The subject cannot be
brought into focus.
Subject with
low contrast Subject with an
extremely bright
area in the center
of the frame Subject without
vertical lines
Subjects at
different
distances Fast-moving
subject The subject is
not in the center
of the frame
The green lamp lights,
but the subject cannot
be brought into focus.