Professional build quality - features stunningly high resolution and high contrast at each focal length point with F/2.8 constant aperture Video support – excels in video recording performance with a mechanism to suppress focus breathing Depth expression and beautiful bokeh – full-range, 11-blade aperture provides smooth defocus gradation from the focus peak to the neighboring area of the image Rugged design – dust/splash*/freeze-resistant design withstands heavy field use under harsh conditions for high mobility Focus Clutch Mechanism– enables instant AF/MF switching, accurate manual focusing and suppressed focus breathing