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.

Electronic communication between an attached camera and lens is supported, maintaining autofocus and image stabilization, including Olympus FAST AF as well as 5-Axis Image Stabilization features whenever possible. Inside this teleconverter, nine optical elements including one HR lens, in four groups with Olympus's ZERO coating help to ensure clarity and color fidelity while reducing ghosting and flare.

Sealed against dust, moisture, and the effects of freezing temperatures, this teleconverter is constructed for dependable weather resistance. When used with the Olympus M.Zuiko Digital ED 300mm f/4 IS PRO Lens, this teleconverter also enables tele-macro photography with up to 0.96x magnification as well as up to +5 EV stops of image stabilization with the Olympus OM-D E-M1X Mirrorless Digital Camera.