The Marshall Electronics VS-M2812-2 3MP CS Mount 2.8-12mm Lens is a manual focus lens designed for the 1/2.7" and 1/3" sensor CS-mount surveillance cameras, including the Marshall CV343, CV345, and CV365 models. Built with high-accuracy aspherical lens elements, high refractive-index glass, and featuring low dispersion, it's particularly suited for high-performance color 1/3" HD sensors.