Redrock Micro has created a Canon EF to Micro Four Thirds lens adapter which adds the electronics required to control the aperture on the mounted EOS lenses – 9V battery and a touch-panel allows the adapter to specify the lens aperture in 1/3EV steps. The adapter (LiveLens MFT) costs $442.50 and is available directly from the manufacturer’s website.
The Redrock Micro LiveLens, Active Lens Mount for Canon EF Lenses currently sells for $495 on amazon, while the manufacturer has an introductory pricing at $442.50.
Redrock Micro’s LiveLens MFT provides the required power and electronics to control Canon EF lenses when attached to a micro four-thirds camera body. With the LiveLens MFT’s control touchpad, the EF lens’ aperture can be open and closed in increments as small as 1/3 stop. The LiveLens MFT works with virtually every EF lens available today, including variable aperture zoom lenses, prime lenses, consumer-level lenses, professional L-series lenses and most third party EF-compatible lenses. A marvel of advanced design, the LiveLens MFT is incredibly compact and weighs less than 6oz. (via dpreview)