The Canon FD to Sony NEX body mount adapter can provide compatibility to a whole new selection of lenses at a fraction of the cost. This adapter allows for Canon FD lenses to be mounted onto a Sony NEX-3 or NEX-5 camera body. Though the lens fits and works seamlessly as an adapter, the automatic diaphragm (AE metering) and other autofocus functions do not work with this adapter. You can use the lens in fully manual exposure mode or in aperture-priority mode. It contains no optics and guarantees infinity focus.