The CS-Mount 2.8-9mm Varifocal Lens from Samsung features a 3MP 1/2.8" CCD sensor to capture high-quality video. The lens has a wide f/1.2 aperture for brighter video and images. This P-iris lens has an auto iris function driven by a stepping motor. The lens is aimed at sharp, crisp images and exposure accuracy under even adverse lighting conditions. The iris auto-close function protects imagers and optical filters from extreme highlights when the power is off.