This lens use 25mm lens and advanced optical elements to ensure all-around definition and efficient light conductivity. Its aperture can be manually adjusted according to the level of light available. High quality alloy case and a good quality lens. This CCTV camera lens can provide super clear for your mirrorless camera. It gives you the widest field of view provided by the 16mm C mounting lens. Applicable to bars, shops, parking lots, houses and warehouses, etc.