Lens mount converter to use Canon EF lenses with Micro Four Thirds Mount cameras. It maintains all the electronics, lens controls are set by camera body. Makes focal length of the lens 0.71x wider. You gain one diaphragm stop.
New optical design to compensate Full Frame coverage lenses: advanced 5-element/4-group optical design incorporating ultra-high index tanatalum-based optical glass to achieve extraordinary optical performance with improved corner sharpness, distortion and reduced vignetting. Makes lens 0.71x wider (example: f/2.8 zoom lenses such as the 24-70mm f/2.8 and 70-200mm f/2.8 zooms by Canon to produce 17-50mm f/2.0 and 50-142mm f/2.0 high-speed zooms, respectively) ONLY with full frame cameras.