Metabones: Use Canon EF lenses on Micro Four Thirds cameras!

Since its inception, Metabones has been designing and manufacturing lens adapters recognised among professionals and enthusiasts as leaders in design and workmanship. Contrary to the popular trend of other factories using an aluminum ring painted black on the camera-body-side, they instead take no short-cuts and use precision-machined brass with chromium plating on both the camera-body and the lens sides of their adapters. The lens side of the adapter features a strong leaf-spring structure, strengthening the adapter-lens connection and ensuring tightness of the lens in order to reduce wear and prevent focus errors and optical alignment issues from appearing.

Electronic

Autofocus
Can be powered either by camera body or by third-party external 5V power source (not included)
Iris/aperture controlled by the camera body
Image stabilization (IS) lens support
Electronic manual focusing (e.g. EF 85/1.2L II and discontinued EF 50/1.0L)
EXIF (focal length, aperture, zoom range)
Distance and zoom display on camcorders (requires lenses supporting distance information)

Other

Detachable tripod foot compatible with Arca Swiss, Markins and Photo Clam ball heads.
The opening is flocked with felt material to reduce internal reflection.
Compatible with all MFT mount cameras, including GH4, OM-D, Blackmagic Cinema Camera, Blackmagic Pocket Cinema Camera and JVC GY-LS300.
Supports EF-S lenses.

No video AF for Olympus

AF may not work if the maximum aperture of the lens plus any EF Extender or other teleconverter attached is smaller than f/8.
AFC (continuous AF) and AFF (flexible AF) modes are not supported
Panasonic video AF may hunt more than a native lens or have unsatisfactory performance.
Tamron lenses may have unsatisfactory video AF accuracy. Canon and Sigma lenses are fine.
No support for Focus Stacking and Focus Bracketing on Olympus.
On Olympus, other than E-M1, you may move the single AF point among any of the 81, but you may not multi-point AF. There is no restriction on E-M1 and Panasonic.
EF-mount lenses are not silent but may make audible click noises during autofocus operation and iris changes which may be picked up by the built-in microphone of the camera. An external microphone is recommended for video.
Iris changes are unsmooth but in 1/8 stop steps which may be noticeable in video recordings. Programmed exposure mode and shutter priority exposure mode should not be used for video.
No support for in-camera correction such as peripheral shading, CA and distortion.

Get Metabones adapter(s) up to speed with these firmware updates, and gain the ability to autofocus Canon EF-mount lenses, as well as fixes for the aforementioned bugs? Grab the firmware at the links below, depending on your chosen operating system:
Metabones firmware version 1.7 for Windows users http://www.metabones.com/article/of/EF-M43_SB_Firmware_Win
Metabones firmware version 1.7 for Mac OS X users http://www.metabones.com/article/of/EF-M43_SB_Firmware_mac