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.

Electronic

• 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.