Metabones Speed Booster Ultra 0.71x Adapter for Canon Full-Frame EF-Mount Lens to Sony E-Mount APS-C Camera (MB_SPEF-E-BT2) with Replacement NP-FW50 Battery & Microfiber Cleaning Cloth Canon EF Lens to Sony E APS-C Body; Full-Frame Lens to Sony E APS-C Body Supports In-Camera Aperture Control; 0.71x APS-C Crop Factor Compensation 1-Stop Increase in Lens Apertures; 5 Optical Elements in 4 Groups Locking Mechanism to Secure Lens; Push-Button Lens Release Brass Mounting Rings; Detachable Tripod Foot