Hitachi DZ-MV350A Instruction Manual page 58

Manually focus the following objects, which may not be automatically focused (See page 57):
Objects not in
the center of
screen
Objects
moving rapidly
Object behind
glass with
water droplets,
dirt on it
58
Objects with
little variation
in brightness,
such as white
wall
Objects lit by
neon sign,
spotlight, etc.
which glares or
emits strong
light
Night view
Objects that
are far and
near at the
same time
Dark objects