Designed to be attached between a compatible lens and a Micro Four Thirds mount camera, the Olympus MC-20 M.Zuiko Digital 2x Teleconverter doubles the magnification of an Olympus M.Zuiko Digital ED 40-150mm f/2.8 PRO Lens or an Olympus M.Zuiko Digital ED 300mm f/4 IS PRO Lens. This provides the effect of an 80-300mm f/5.6 and a 600mm f/8 lens respectively, dramatically boosting the apparent focal length of those lenses with a minimal increase to the size or weight of the camera and lens combination.