The CS-Mount 8.5-40mm Varifocal Lens from Computar is designed for day/night cameras with 1/3" format sensors. The lens facilitates easy focal length adjustments, enabling you to change the focal length without having to move your camera from its installation point. With an aperture of f/1.3 to 16C, the lens is suitable for surveillance in low light as well as bright light conditions. Furthermore, this IR-corrected lens captures clear images, eliminating focus shift and infrared bleed.