Viltrox EF-NEX IV is designed for Canon EF Lenes to be used on Sony E mount series mirrorless cameras.
It is compatible with Sony A7 series full frame cameras, featuring funtions of Auto focus(PDAF&CDAF).
It can be upgraded by USB port.
Usage of Focus Mode Switch ( PDAF&CDAF ):
1. Before using, please confirm the focus mode of the lens mount adapter, and then attach it on the camera.
2. If you need to change the focus mode, please take the adapter ring off, slide the focus mode switch,
and attach it on the camera then.