• Adapted lens power placement to thoroughly correct image curvature that causes poor performance in the peripheral. Provides high performance across the screen The use of double-sided aspherical lens provides excellent correction for spherical aberration, asymmetrical aberrations. The point light source around the screen reduces bleeding, allowing you to express a beautiful bokeh near opening • The internal mechanism is equipped with an ultrasonic motor HSM (Hyper Sonic Motor) for faster AF speed and silent. Improved AF algorithms for smoother AF After focusing the focus, you can also get a full time manual that can fine tune the focus • Super multi-layer coating reduces flare and ghosting for high contrast depiction even when shooting in backlight • Nikon F-Mount