Amazon.com : Olympus V321210BW000 M.Zuiko Digital 1.4X Teleconverter MC‑14 for M.Zuiko Digital ED 40‑150 mm PRO F2.8 Lens & M.Zuiko Digital ED 300 mm F4 PRO Lens, Black : Electronics
Olympus releases 2x Teleconverter and announces major OM-D E-M1 Mark II camera upgrade via firmware update - Olympus EMEA
Olympus M.ZUIKO DIGITAL MC-14 1.4x Teleconverter | Digital Photography Live