The Metabones Canon EF lens to Sony NEX Smart Adapter IV allows you to use EF or EF-S lenses on a Sony NEX mount camera. It is compatible with full frame NEX cameras such as the a7s and a7r. This Smart Adapter has the following features:
* True electronic integration of aperture diaphragm - let camera automatically choose aperture in P or S exposure modes, or dial in yourself on the camera body in A or M modes.
* Powered by camera body. No external power source required.
* Wide open button (opposite of depth-of-field preview function) makes manual focusing easy.
* The tripod foot is detachable and compatible with Arca Swiss, Markins, Photo cam ball heads.
For a complete compatibility list click here.
Note: Vignetting at corners may occur for certain EF-S lenses because they are designed to cover a 1.6x crop image circle but Sony NEX has a 1.5x crop sensor.