Hitachi DZ-BX31E Instruction Manual page 72

Manually focus the following objects, which may not be automatically focused (see page 71):
Objects not in
the centre of
screen
Objects
moving rapidly
Object behind
glass with
water
droplets, dirt
on it
72
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