*20mm focal length, F2.8 aperture
*8 groups of 10 elements optical construction, including 2 ED lenses, 1 lenses with high refractive index and 2 aspherical lenses
*HD Nano multilayer coating with water-resistant and antifouling coating
*Electronic aperture,internal focus,constant lens length
*Noiseless STM focus motor
*Precision hardened aluminum alloy bayonet
*Convenient and lightweight