The olympus 40 150mm f28 pro mzuiko digital lens with 14x teleconverter attached extends the zoom power of the lens to a 420mm equivalent without greatly increasing the weight or size the lens comes with a maximum f28 aperture and a new focusing system which powers two high grade elements using dual linear motors for ultra quick and near silent focusing the lens offers a 70cm minimum focusing distance at all focal lengths and both feature a metal cased dust splash and freeze proof b