Cooke S4/i - Super35mm Prime Lenses - 50mm T2 - METRIC

Award winning Cooke S4 Prime Lenses were designed and developed in close technical collaboration with industry professionals. They are colour-matched and compatible with Cooke's, 18-100mm T3.0 and 25-250mm T3.7, 15-40mm, T2.0 CXX zoom lenses and the SK4 16mm lenses.

Cooke S4 optics offer superb optical and mechanical performance, control of flare, distortion, veiling glare and spherical aberrations at full aperture. The cam-type focus mechanism allows for smooth focus adjustments. Modular construction increases ease of maintenance and serviceability. 

 Technology 

All of our S4 Prime lenses (and CXX zoom lens) are now supplied equipped with /i Technology, as of February 2005. S4/i lenses are designed for all PL mounted professional motion picture film and electronic cameras. The /i Technology provides cinematographers and camera operators with vital information on lens setting, focusing distance, aperture and depth-of-field, hyperfocal distance, serial number, owner data, lens type and focal length in both metric and footage measurements. For zoom lenses, the zoom position is displayed.

65 Soft Effects Attachment

The 65 Soft Effects is made for the S4/i 65mm and 75mm lenses (via Cooke 75mm adapter ring). The design for the attachment is based on Cooke's PS945 soft focus lens for 4x5 large format photography. See the effect in sample photos taken with the PS945 lens. The effect is high resolution with a stunning glow to the highlights -- subtle, but most pronounced wide open at T2, becoming less pronounced as you stop down. (Effect from T2 to T4 with the 65mm lens; T2 to T5.6 with the 75mm lens.)

Cooke S4/i lens Awards

1998Cinec Award for Technical Excellence, Germany
1999Academy of Motion Picture Arts and Sciences Scientific and Engineering Award for Optical and Mechanical Design
2000Primetime Emmy Award for Outstanding Achievement in Engineering Development
2001Two Queen's Awards for Enterprise - International Trade and Innovation, England
2001Winner, Exporter of the Year, 2001 International Business Award, Export Times and Trade Partners UK
2001Winner, Product Innovation, 2001 International Business Award, Export Times and Trade Partners UK
2007NAB2007 Premiere Product Award – S4/i System



- Maximum Format Cover  --  30mm diameter (Super 35mm format)

- Focus Scales  --  Two opposing focus scales - metric or footage. Scales marked from infinity to MOD.

- Focus Drive Gear  --  140 teeth 0.8 metric module x 6.0mm wide x 98mm from image plane. 140 teeth 0.8 module x 6.0mm wide x 99mm from image plane (300mm)

- Iris Scales  --  Two opposing linear T-scales - whole and third stops marked.

- Iris Drive Gear  --  134 teeth 0.8 metric module x 4.0mm wide 79.5mm from image plane.

- Internal Front Fitting Filter  --  Internal thread for filter adapter M105 x 0.75 pitch (12mm and 14mm not applicable). M120 x 1.0 pitch (150mm). M131 x 1.0 pitch (180mm, 300mm)

Main Features

Optical Design  --  The optics are designed to give maximum performance at full aperture with superior control of flare, distortion and spherical aberration.

 Electronics  --  Accessible via contacts in PL mount that sync with /i compatible cameras.

Colour Balance  --  All S4/i prime lenses are colour balanced, color-matched and compatible with Cooke 5/i, miniS4/i and Anamorphic/i.

Aperture  --  All S4/i primes have a true T2 aperture and cover Super 35mm format, apart from the 300mm (2.8).

Index Marks  --  Every index mark is labelled. More detailed markings allow for more detailed focus control.

Focus Movement  --  Our Academy Award® winning cam-style focus movement coupled with the added benefit of a large lens barrel diameter, has allowed for an increased number of focus markings, particularly at close focus. Spherical aberration has been controlled throughout the range of focal lengths to eliminate compensation of changes in back focus with aperture. A four-point contact bearing provides a smooth positive backlash-free movement.

Camera Mounts  --  Cooke Hardened PL Mount with /i Technology contacts.

Focus Scaling  --  Large, clear numerals on both sides of the focus barrel benefit the focus puller when shooting under difficult lighting conditions. Plus the the Entrance Pupil position is engraved on the lens.

Compatibility  --  All Cooke S4/i 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

 External Finish  --  A scratch resistant PTFE hard anodised finish is provided on all Cooke lenses, providing a durable, hard-wearing surface to meet the most demanding environmental conditions.

Iris  --  An eight-leaf linear module iris assembly is fitted into S4/i primes with an aperture range of T2 to T22.(Except 300mm)

Weight/Size Ratio  --  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/i prime lenses are designed to meet a market requirement for fully reliable performance with a minimum of downtime.