This lens is a 25mm lens incorporates advanced optical elements to ensure all-around sharpness and efficient light conductivity. Its iris can be manually adjusted according to available light levels. LARGE APERTURE: maximum aperture F1.4 can create a beautiful dream of the virtual effect FULL METAL: all of lens body is made of metal HIGH DEFINITION AND COATING FILM LENS FILTER: with definition&muti-coating lens filter that can shoot highly quality photo FOCUS TO INFINITY:It is ideal for use in bars, shops, parking lots, houses and warehouse, etc. .