The Pentax 35mm f3.5 AL SMC FA lens with 645 mount is a wide-angle lens with a focal length equivalent to 28mm in the 35mm format. The lens features Inner Focusing, SMC (Super Multi Coatings) lens coatings to increase the amount of light transmitted by the lens and 2 aspheric lens elements for sharp pictures. The lens is compatible with both film and digital Pentax 645 cameras.