This is a review of the Olympus Zuiko Digital ED 50-200mm f/2.8-3.5 SWD camera released recently. The Olympus Zuiko Digital ED 50-200mm f/2.8-3.5 SWD is a fast and robust telephoto zoom lens for the Four Thirds system. Offering an angle-of-view range similar to that of a 100-400mm lens on a 35mm body, the Zuiko Digital ED 50-200mm f/2.8-3.5 SWD boasts a dust- and drip-proof construction, a Supersonic Wave Drive auto-focus motor and an iris diaphragm with 9 rounded blades. The optical formula comprises 16 lens elements arranged in 15 groups, including no less than 3 ED glass elements.