The lens is what defines the camera's field of view. A fixed network camera will have a "fixed-focal" lens, meaning its focal length is not adjustable. The focal length, measured in millimeters (mm), determines how "wide" or "narrow" the view is.
: Discreet and harder to tamper with, these are popular for retail and office interiors because it's difficult for onlookers to tell exactly where the lens is pointing. The lens is what defines the camera's field of view
Limitations