Canon EF mount lens to Blackmagic Design cameras with M43 mount, specific for BMPCC4K.

Increase maximum aperture by 1 ¹/₃ stop. (with a maximum output aperture of f/0.80).

Increase MTF.

Makes lens 0.64x wider.

Patented 7-element/4-group optical design by Caldwell Photographic in the USA.