Panasonic NV-S99A - Manual (Page 30)

Operation Principle of the Auto Focus Mode (Automatic Focusing)
(Fig. 2)
TV Screen
(Fig. 3}
Image area on which the Auto Focus Mode adjusts the focus.
■ Focusing
If you look at an object through a magnifying glass and move it closer or further away from your eye, you will
reach a point where the object becomes clearly visible, and when you move it past that point, it will become
blurred again. Being focused or in focus means that the subject is seen with optimum clarity and sharpness.
The distance between the tens and the point where the rays of light come together is called local distance” or
“focal length” and it depends on the size and shape of the lens.
•In Human Eyes
Human eyes have lenses as well, and when we look at objects at different distances, the shape of these lenses
changes automatically so that we can always see these objects dearly.
•In the Movie Camera
The image of the subject enters the Movie Camera through the lens and is converted into an electrical signal
(video signal) for recording onto magnetic tape. In the Movie Camera, the “Auto Focus” system automatically
adjusts the focal distance by moving the focusing lens forward or backward.
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