K&F Concept Lens Mount Adapter EF-E with AF Electronic Contacts Everything in the photos is included. I found this very useful for attaching Canon EF mount lenses and using autofocus and aperture control, but I no longer need it as I've switched camera mounts. Manufacturer's Description: Built-in metal electronic contacts ensure high-efficiency conductivity and high-speed transmission. Supports functions such as high-speed autofocus, camera-side aperture adjustment, EXIF signal transmission, and image stabilization.