Along with Olympus OM-D E-M1 mirrorless camera, Olympus has also unveiled a high-end standard zoom to match the E-M1, the M.Zuiko Digital ED 12-40mm F2.8 PRO. It offers a 24-80mm equivalent range, is dust-, splash- and freeze-proof, and uses a manual focus clutch design similar to the 12mm F2 and 17mm F1.8 primes. A minimum focus distance of 0.2m offers 0.3x magnification, and the lens has a L.Fn button whose function can be customised from the camera. The 14 element / 9 group design is packed full of exotic glass, and includes two aspheric elements. Minor ergonomic improvements include a locking lens hood and centre-pinch lens cap.