The Viltrox EF-NEX IV Lens Mount Adapter is the fourth generation electronic adapter from Viltrox, with which you can use Canon EF and EF-S lenses on Sony A9, A7, A6000 and NEX series cameras. This mount adapter has two important functions; an integrated USB port for firmware updates and a switch to choose between CDAF (contrast detection auto focus) and PDAF (phase detection auto focus) mode. In addition, the EF-NEX IV has a built-in anti-shock function. With the included tripod adapter you can easily place your lens on a tripod.