Uniden UDC-5M Instruction Manual page 30

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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