The used Metabones Canon EF Lens to Blackmagic Cinema Camera Speed Booster allows you to mount Canon-EF lenses to the Blackmagic Cinema Camera Micro 4/3 Mount. Key features include:

Canon EF Compatibility. This adapter was designed specifically for Micro 4/3-mount cine cameras such as the Blackmagic Cinema Camera Micro 4/3 Mount and the Blackmagic Pocket Cinema Camera. It lets you use Canon EF-mount lenses on the BMCC/BMPCC.

Wider Focal Length and Increased Aperture. This BMCC version of the Speed Booster widens the mounted lens’s focal length by 0.64x, effectively reducing the overall sensor crop factor from 2.39x to 1.53×. Additionally, the adapter increases the maximum aperture of the mounted lens by 1 1/3 stops, with a maximum output aperture of f/0.8.

Limited Electronic Communication. The BMCC Micro 4/3’s passive mount does not provide autofocus or aperture control from camera. Manual aperture adjustment must be done from the adapter’s toggle dial. Image stabilization requires an external USB power source (not included). When used with the BMPCC, aperture control from camera and image stabilization are supported and powered by the camera body.

Sturdy Design with Built-In Tripod Foot. The aluminum barrel and brass mounts give it a solid feel, with an Arca-Swiss compatible tripod foot that lets you mount the adapter itself directly to a tripod. This ensures the lens’s weight doesn’t put additional stress on the camera’s mount.