Ricoh R50 Instruction Manual page 32

The following examples are some of the situations where the autofocus
function may work, but not as desired.
i When both near and far objects are
present
Use the focus-lock function to lock the
focus on an object at the same distance as
the desired subject, then reposition the
camera to compose the picture.
i Fast-moving subjects
Use the focus-lock function to lock the
focus on an object at the same distance as
the desired subject, then reposition the
camera to compose the picture.
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