This adapter will allow you to mount older F-mount and even premium Nikon G lenses to your Sony NEX E-mount video cameras such as the Sony FS-100 or DSLR cameras such as the Sony Alpha NEX- 5 and Sony Alpha NEX- 7. With the precision mechanical adapter ring, you can control automatic exposure metering/stop-down metering. However, while using this adapter, you will lose the electronic functions of the lens such as the ability to auto-focus.