Panasonic NV-DS99EN Operating Instructions Manual page 97

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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. Being focused or in
focus means that the subject can be seen with optimum clarity
and sharpness.
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 clearly.
Movie Camera
The image of the subject enters the Movie Camera through the
lens and is converted into an electric signal (video signal) for
recording onto magnetic tape. The focus is adjusted either
manually or automatically by moving a focusing lens.
Auto Focus Adjustment
The Auto Focus System automatically moves the internal
focusing lens forward or backward and adjusts the focus so
that the subject can be seen clearly.
The Auto Focus Adjustment has the following characteristics:
•It adjusts until the vertical contours of the subject are as
sharp and clean as possible.
• It adjusts the focus on the subjects with strong contrast.
• It adjusts the focus on the subject in the centre
of
the LCD
Monitor or Finder.
Unlike human eyes, the lens of the Movie Camera cannot
instantaneously change the focus from a nearby to a distant
subject and vice versa.
Lens Unit
The lens construction used in this Movie Camera generates
some clicking noise if the Movie Camera is rocked up and
down while it is turned off. This is not a malfunction of the lens
unit. This noise does not occur when the Movie Camera is
turned on.