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CC640 Digital Camera
8.2 Focus and Zoom Adjustment
The lens is equipped with manual zoom and focus adjustment rings. The most
practical way to adjust the lens is by utilizing a normal Television monitor or a
portable Television.
• Connect an appropriate video cable from the video output connector
(RCA Jack) of the camera to the video input on the video monitor of the
television.
• Turn the power switches of both the camera and the television to the ON
position and then press the Set-up Button. Within a few seconds the video
should appear on the monitor. Consult your monitor owner’s manual for
additional instructions on displaying video from the video input jack.
• Once the video is observed on the monitor, loosen the 2 thumbscrews on
the adjustment rings of the lens.
• It is generally easier to adjust the zoom first and then the focus.
• Once the zoom is adjusted as desired tighten the thumbscrew so that the
zoom will not inadvertently move when the focus is adjusted.
• Adjust the focus ring and then tighten its thumbscrew as well.
Recommendation: If the camera is targeted at an object that is far away (100
Metres or more), then it may be beneficial to adjust the lens before taking the
camera into the field by using an object that is at a similar distance away. It is
generally much easier to use a larger monitor in an office environment, rather than
a portable TV at the installation site, as sunlight tends to make it difficult to view a
television screen outdoors.
8.2.1 Temperature Variations and Focus
The CC640 can operate under extreme temperature variations. The focus of the
lens can change slightly with large variations in temperature. For example, if a
lens is focused at +25°C the lens may be slightly out of focus at -30°C. The
change in focus will be less noticeable if the focus is adjusted closer to the
cameras operating temperature.
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