Fixed cameras allow the permanent recording of specific points and are the most common type of camera used. Fixed cameras can have zoom lenses to focus at the right level of detail for the desired application.
PTZ (Pan, Tilt, Zoom) Cameras
PTZ cameras allow the operator to move the camera focus, giving an overview of a much wider area than fixed cameras. Operators can also zoom in on the intricate details that may be taking place in a scene. The drawback of PTZ cameras is the loss of focus on specific areas whilst the camera is being pointed elsewhere, this can be elevated by the addition of fixed cameras dedicated to the most important points of a given area.
Panoramic 180⁰ / 360⁰ Cameras
Panoramic cameras provide a hybrid solution between fixed and PTZ cameras. By recording a much wider area in very high definition, an operator can zoom in on a specific point within the field of view without affecting the continued recording of the whole area.
Thermal cameras provide an additional level of surveillance by detecting heat rather than visible light. This means thermal cameras can still "see" in total darkness or in fog. Thermal cameras can also be used to pick up on body heat, even when hidden in the visible scene such as a person camouflaged in bushes.