ViewZ VZ-D2-7X24RDCIR-MP-4W 1″ 4MP Day/Night, Motorized Zoom with DC Auto-Iris

An auto-iris lens without an internal circuit to control the iris. All iris control voltages come from a circuit located within the camera to adjust the iris for changing light levels. DC-type lenses are recommended for use in inconsistent lighting conditions (e.g. outdoors). These are sometimes referred to as DD (Direct Drive) lenses.