The M.Zuiko Digital ED 150-400mm f/4.5 TC1.25X IS PRO from Olympus, is a super-telephoto zoom lens characterized by its expansive range, built-in teleconverter, and relatively sleek design for handheld use. The constant f/4.5 maximum aperture affords consistent illumination throughout the zoom range and is reduced slightly to f/5.6 when the teleconverter is in use. Super-telephoto zoom is designed for Micro Four Thirds mirrorless cameras this zoom offers a 300-800mm equivalent focal length range, which can be extended even further using the integrated 1.25x teleconverter for an effective 1000mm equivalent focal length. Advanced optical construction includes one EDA (extra-low dispersion aspherical) element, four Super ED (extra-low dispersion) elements, two ED elements, two HR (high refractive index) elements, and one HD element. These specialized elements help to reduce various aberrations, color fringing, and distortion in order to realize high sharpness, accurate rendering, and vivid clarity. This system can also work in conjunction with camera-based stabilization, via Sync IS, for even more powerful stabilization to suit working at the extreme ends of the zoom range. The lens also has an integrated tripod collar for balanced support when shooting from a tripod and, as a PRO lens, it sports a weather-sealed design that is dust-, moisture-, and freeze-resistant for working in inclement conditions. Its Rounded nine-blade diaphragm produces a smooth bokeh quality. A Z Coating Nano has been applied, too, which controls flare and ghosting for higher contrast and accurate color rendering in strong lighting conditions. It is Compatible with optional MC-14 1.4x and MC-20 2.0x Teleconverters for even greater reach.