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CCTV lens is a device that regulates the angle of view of the camera and transmits light from the environment onto the camera's image sensor. : Adjusts a fixed angle of view depending on the focal length of the camera. Vari-focal lens: Creates a variable angle depending on the focal length of the camera. Zoom Lenses Lens: These lenses are also types of adjustable lenses that are equipped with a focal length motor that can be changed by zoom lens has changed. Zoom lenses usually focus automatically.