The definitive large-diameter zoom lens for any shoot. To fulfil the uncompromising image quality standard of the Art line, this lens features a power distribution that has been optimized in exacting detail. Three SLD glass lens elements and four spherical lens elements help minimize optical aberrations. To ensure outstanding image quality from the centre to the edges of the photograph, the optical system minimizes coma, which causes points of light to streak, and transverse chromatic aberration, which cannot be corrected by adjusting the aperture. The optical system also minimizes distortion, which can be particularly evident in wide-angle shots, resulting in excellent optical performance throughout the zoom range. Designed for use in a wide variety of situations, the optical stabilizer (OS) offers a powerful stabilization effect of 4 stops. The newly designed hypersonic motor (HSM) offers 1.3 times the torque of its predecessor. Even at low speeds, it offers exceptionally stable performance. Full-time manual focus function allows the lens to be switched to manual focus simply by rotating the focus ring. Since the area of the lens most vulnerable to dust and other foreign bodies is the mount, a rubber sealing helps provide peace of mind. In addition, the front lens element features a water- and oil-repellent coating that helps the lens perform well in the rain, near water, and in other challenging conditions.