Telephoto zoom lens series olympus profi olympus zuiko digital lens mount four thirds 43 lens speed 28 focal length 50 200 mm zoom factor 4 times suitable for sensor type four thirds 43 construction zoom lens area of use night photography sports photography focus auto focus internal focus af motor ultrasonic motor usm reduced frame size closest focusing distance 120 cm focal length equivalent to 35mm camera 100 400 mm lens type ed lens c