The world's first standard zoom lens to feature a large f2.0 aperture *. Boasting industry-leading imaging performance, this lens is a worthy addition to our Super High Grade (SHG) series. The flagship of the ZUIKO DIGITAL series, this lens was developed to meet the requirements of the most demanding professionals. With features like the best possible image quality, reliable dust-/drip-proofing, Olympus’s exclusive SWD-driven ultra-fast AF system, a mechanically interlocked manual focusing mechanism, and a large, flower-shaped hood with a polarization filter control window, this lens offers the reliable, trouble-free performance you need to express yourself with confidence. *Among interchangeable lenses for digital SLR cameras. (Survey by Olympus).