The constant f/2.8 aperture and internal zoom mechanism, a first for its class, maintain the lens's center of gravity for stable gimbal use while its Nano Crystal Coat and ED elements suppress flare and ghosting. Its optical formula delivers sharpness and pleasing bokeh in a weather-sealed, 900g body that is smaller and lighter than typical 24-70mm f/2.8 lenses. This lens is best for landscape photographers and video shooters who need a durable, stabilized workhorse zoom with silent, fast autofocus.
