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Metabones MkIV speed booster EF-E mount Adapter

The Metabones Canon EF to Sony NEX Speed Booster allows you to mount any Canon EF-mount lens to compatible Sony NEX E-mount cameras and camcorders. While electronic communication between the Sony camera and Canon lens is provided, like the other Metabones EF/NEX Adapter, what separates this adapter from all the others is that the adapter effectively increases your lens’ maximum aperture by 1 stop and widens your focal length by .71×. In other words, a Canon 50mm f/1.2 L would become a 35.5mm f/0.9 lens.

Like other Metabones EF/NEX Adapters, it allows full control of aperture when shooting in A and M exposure modes, or lets the camera control operator 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 the Image Stabilization function of compatible lenses, allowing you to shoot at slower shutter speeds and help eliminate camera shake. The adapter itself is powered by the camera, so no additional power source is needed. It has a metal barrel construction, with both mounts being metal as well. Since the aperture blades change as you make adjustments, there is a “wide open button” which functions as the opposite of a depth-of-field preview button.


Increase MTF
Makes lens 0.71x wider
Increase maximum aperture by 1 stop
Powered by camera body. No external power source required
Partial autofocus support for late-model (post-2006) Canon-brand lenses
High performance 32-bit processor and efficient switched-mode power supply
Electronic integration of aperture diaphragm, controlled by or from the camera body
The tripod foot is detachable and compatible with Arca Swiss, Markins, Photo cam ball heads