The optics are designed to give maximum performance at full aperture with superior control of flare, distortion and spherical aberration.
All S4 prime lenses are colour balanced, color-matched and compatible with Cooke 5/i, miniS4/i and Anamorphic/i.
All S4 primes have a true T2 aperture and cover Super 35mm format, apart from the 300mm (2.8).
Every index mark is labeled. More detailed markings allow for more detailed focus control.
Cooke Hardened PL Mount
Large, clear numerals on both sides of the focus barrel benefit the focus puller when shooting under difficult lighting conditions. Plus the Entrance Pupil position is engraved on the lens.
All Cooke S4 Primes have a common fixed front diameter of 110mm, (except for 12mm, 150mm, 180mm, 300mm) with a focus drive gear of 140T x 0.8 mod and an iris drive gear of 114T x 0.8
A scratch resistant PTFE hard anodized finish is provided on all Cooke lenses, providing a durable, hard-wearing surface to meet the most demanding environmental conditions.
An eight-leaf linear module iris assembly is fitted into S4/i primes with an aperture range of T2 to T22.(Except 300mm)
The lenses are designed for all shooting applications, including handheld and Steadicam, providing comfortable balance ratio with the latest compact cameras.
Reliability and Service
S4 prime lenses are designed to meet a market requirement for fully reliable performance with a minimum of downtime.