The Nikon 16-35mm f/4 ED AF-S VR is a fully featured professional ultrawide angle zoom for Nikon cameras. The focal range of 16-35mm is a great option for everything from landscape, travel, archetecture to street photography and photojournalism and documentary work of all kinds. The maximum aperture of f/4 offfers respectable light gathering without the incumberance of more aperture and the VR Vibration Reduction helps reduce camera shake at slower shutter speeds for steady shots in low light. It's a very sharp optical design with 3 aspherical elements and 2 ED (Extra Low Dispersion) elements. It also features Nikon's VR (Vibration Reduction). It is a professional lens for the professional Nikon shooter and the growing enthusiat alike.