Hitachi DZ-GX5040E Instruction Manual page 56

Manually focus the following objects, which may not be automatically focused (see page 55):
Objects not in
the centre of
screen
Objects
moving rapidly
Object behind
glass with
water
droplets, dirt
on it
56
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