Hitachi VM-E310A - Manual (Page 44)

Advanced Techniques
44
The auto focus will not work under the following conditions and you must focus
manually:
Objects outside the center of the viewfinder
Objects at different distances in the center of the viewfinder
Brightly lit objects such as a neon light, objects lit by spotlight, etc.
Objects behind water dappled or dusty glass
Objects with little difference in light reflection such as a white wall
Rapidly moving objects
Dark objects
Note: With the T zoom control you can use the auto focus with subjects that are 3.3 feet
away from the lens and further away to infinity. With the W zoom control you can use the
auto focus with subjects 0.4 inches away from the lens and further away to infinity.
Using Manual Focus