| The Glossary An all inclusive glossary of security lingo is provided for your convenience. This list will undoubtedly be helpful when delving in to the realm of security. |
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| Z: Z - In electronics and television this is usually a code for impedance. Zoom lens. A camera lens that can vary the focal length while keeping the object in focus, giving an impression of coming closer to or going away from an object. It is usually controlled by a keyboard with buttons that are marked zoom-in and zoom-out. Zoom ratio - A mathematical expression of the two extremes of focal length available on a particular zoom lens. |
Courtesy of CCTV Labs and CCTV focus magazine
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