In a closed-circuit surveillance system, a camera is also called a camera or CCD (Charge Coupled Device). Strictly speaking, a camera is a general term for a camera and a lens. In fact, cameras and lenses are mostly purchased separately. Users calculate the focal length of the lens based on the size of the target object and the distance between the camera and the object. Therefore, the lens required by each user is determined according to the actual situation. Don\'t assume that the camera (head) already has a lens.
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