With a focal length of 12mm, this is the widest lens in the Cooke S4i lens series. Like all Cooke S4i primes, the 12mm is colour balanced to be compatible with Cooke 5/i, miniS4/i and Anamorphic/i lenses. It also maintains the T2 maximum aperture which is standard across the S4i lens range.

The Cooke 12mm S4i has a 156mm front diameter and is supplied with a two-stage 6×6 clamp-on mattebox.