The Metabones Canon EF Lens to Sony E Camera Adapter IV is the fourth iteration of the Metabones Smart Adapter for EF to E. Key features include:

Full-Frame Support. The Metabones Canon EF Lens to Sony E Camera Adapter IV supports the full-frame Sony a7, a7R, a7S, and NEX-VG900.

New to the Mark IV. The Mark IV’s new inner housing design features a larger opening than the Mark III’s, improving functionality when using a Tilt-Shift lens. A black coating has been applied to the inner housing, further reducing internal reflections that can cause flare.

Updated Version. There’s a new version of this adapter: the Metabones Canon EF-S Lens to Sony E Mount T Smart Adapter IV.

Canon EF Lens To Sony E Camera. This adapter allows you to mount Canon EF-mount lenses to Sony E-mount cameras and camcorders. It offers full-frame coverage, making it the go-to Canon adapter for use with the a7, a7R, and a7S.

Electronic Communication. It gives you full aperture control when shooting in A and M exposure modes, or lets the camera control aperture if shooting in P or S exposure modes. Not only do you have aperture control, but it’s also embedded in the EXIF data. The Metabones adapter also supports compatible lenses’ Image Stabilization functions, allowing you to shoot at slower shutter speeds and helping to eliminate camera shake.

Powered by the Camera Body. This adapter is powered by your camera body. It doesn’t require any additional power source.

Green Power-Save Mode. The power-save mode reduces battery consumption by reducing aperture diaphragm and image-stabilization actuation during image preview.

Durable Metal Construction. This adapter’s barrel and mounts are all constructed of metal. It offers a removable Arca-Swiss type plate for added lens support. Since the aperture blades change as you make adjustments, there’s a “wide-open” button which functions as the opposite of a depth-of-field preview button. Finally, the adapter’s interior has a proprietary anti-reflection coating.