When you install this M.Zuiko Digital MC-14 1.4x Teleconverter from Olympus between a compatible lens and a Micro Four Thirds mount camera, it provides a 1.4x magnification factor to dramatically boost the apparent focal length of the lens with minimal increase to the size or weight of the camera and lens combined. Featuring a metal build that is freeze, splash, and dustproof, it utilizes six optical elements.