Metabones T Speed Booster ULTRA 0.71x Adapter, Canon EF Lens to BMPCC4K Camera

Optical
Canon EF mount lens to Blackmagic Design cameras with M43 mount, specific for BMPCC4K
Increase maximum aperture by 1-stop. (with a maximum output aperture of f/0.9)
Increase MTF
Makes lens 0.71x wider
Patented 6-element/4-group optical design by Caldwell Photographic in the USA

Electrical
Lens iris/aperture is set by the controls on the camera body
Smooth iris support with the latest Canon (2009+), Tamron (SP series 2013+) and Sigma (2016+) lens models
Image stabilization (IS) lens support
Push autofocus if supported by camera
Cinema EOS lens support (CN-E 18-80mm T4.4 L), including AF (requires external 5V power via micro USB port), auto iris and servo zoom
Powered by camera body. With most lenses, no external power source required

Mechanical
Flocking to reduce internal reflection
Rubber gasket protects M43 mount connection from dust and moisture
Aluminum alloy and brass construction with chromium plating
Satin surface finish
Detachable tripod foot compatible with Arca Swiss Style ball head, such as Markins and Photo Clam or attach to quick release plate by a 1/4″-20 screw
The tripod foot is tailor-made to match the exact height as the BMPCC4K camera body