The M.Zuiko Digital ED 100-400mm f/5.0-6.3 IS lens from Olympus is an excellent addition for OM-D photographers, which offers a huge telephoto focal range of 200-800mm (35mm equivalent). Despite the impressive range, the lens is extremely compact at just 205mm long and lightweight enough to bring anywhere, making it ideal for wildlife, action and sports photographers. Extensive dust and weather sealing provide peace of mind when shooting during inclement weather, which is ideal for outdoor users. Advanced optical engineering incorporates a combination of four Extra-low Dispersion (ED) lenses, two Super High Refractive Index (Super HR) elements and two HR (High Refractive Index) lenses. Together these combine to deliver edge to edge sharpness with bright clear images and video, along with well controlled ghosting and flaring for sunlit conditions.