When introduced, Cooke S4 primes quickly became an industry standard and loved by cinematographers for their warmth and gentle focus falloff, now known as the "Cooke Look". Offering superb optical and mechanical performance, they veil glare and spherical aberrations at full aperture, their cam-type focus mechanism allows for smooth focus adjustments, and their modular construction increases ease of maintenance and serviceability. The S4/i Data Technology provides vital metadata about lens settings, focusing distance, aperture and depth-of-field, hyperfocal distance, serial number, owner data, lens type, and focal length used by focus pullers on set, Post, and VFX work.