The Contax N Lens to Sony E-Mount Adapter from Monster Adapter is designed to support all nine Contax N-mount Carl Zeiss lenses with electronic communication. It lets you attach these lenses to Sony E-mount cameras, and it supports automatic data transmission, autofocus, and aperture control via the lens aperture ring. The adapter also features a dust-resistant rubber ring on the E-mount bayonet. The ring is not 100% dustproof but does minimize the possibility of dust and moisture entry. A removable tripod mount adapter is also included. It secures to a 1/4"-20 threaded port on the lens.