How to Set Up Motorized Zoom Lenses

Written by brandon getty
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How to Set Up Motorized Zoom Lenses
Motorised zoom lenses are often used in video surveillance. (Jupiterimages/ Images)

Motorised zoom lenses are commonly used on closed-circuit television (CCTV) cameras -- better known as security surveillance cameras. When affixed to the front of a security camera, they allow up to 20x zoom capability, depending on the model. This lets the user isolate a specific part of the scene -- such as a thief in the act or the number plate number of a getaway car -- and enlarge it for greater scrutiny. Because of the basic construction of most motorised zoom lenses, they are simple to install and operate.

Skill level:
Moderately Easy

Things you need

  • CCTV camera
  • Display monitor
  • Zoom/focus controller

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  1. 1

    Mount the lens by screwing it clockwise into the camera head.

  2. 2

    Connect the 200mm Auto-iris cable to the appropriate socket (4-pin) on the camera head. This ensures proper exposure of the image by automatically controlling the amount of light that passes through the lens.

  3. 3

    Insert one end of the 400mm zoom/focus control cable into the appropriate socket (8-pin) on a zoom/focus controller.

  4. 4

    Connect the camera to a surveillance monitor. Attach both the camera and the monitor to a power supply.

  5. 5

    Adjust the "LEVEL" and "ALC" knobs on the zoom/focus controller until a picture is displayed on the monitor.

Tips and warnings

  • Most lenses arrive with an Auto-iris and zoom/focus controller cable. If you have purchased a lens without these cables, contact the manufacturer for replacements. Spare zoom/focus controllers may also be purchased through the manufacturer.
  • Do not aim the lens at the sun. Doing so may cause loss of eyesight, damage to the optics or a risk of fire.

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