Metabones Speed Booster XL 0.64x Adapter for Full-Frame Canon EF-Mount Lens to Select Micro Four Thirds-Mount Cameras Canon EF Lens to Micro 4/3 Body Supports In-Camera Aperture Control 0.64x Micro 4/3 Crop Factor Compensation 1.3-Stop Increase in Lens Apertures 6 Optical Elements in 4 Groups