Af 28/1.8 Fe is an autofocus lens suitable for E-mount, the lens uses 11 elements in 9 groups, including 3 Ed lens, 3 high transparent lens and 2 aspheric lens. Hd Nano multilayer coating with water-resistant and anti-fouling coating. Electronic aperture, internal focus, constant lens length. Noiseless Stm focus motor. Precision metal structure..