•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