The award-winning Cooke S4 prime lenses have been designed and developed in close technical collaboration with industry professionals. They are colour-matched and compatible with the Cooke 18-100mm T3.0, 25-250mm T3.7, 15-40mm, T2.0 CXX zooms and SK4 16mm lenses.nnCooke S4 optics deliver superb optical and mechanical performance, control of flare, distortion, veiling glare and spherical aberrations at full aperture. The cam focus mechanism enables smooth focus adjustments. Modular construction facilitates servicing and maintenance.nnTechnologynnSince February 2005, all our S4 prime lenses (and the CXX zoom) have been equipped with /i Technology. The S4/i lenses are designed for all professional film and electronic cinema cameras with PL mount. /i Technology provides cinematographers and camera operators with essential information on lens settings, focus distance, aperture and depth of field, hyperfocal distance, serial number, owner data, lens type and focal length in metric and imperial measurements. For zooms, the zoom position is displayed.nnSoft Effects 65 AccessorynnThe Soft Effects 65 is designed for the S4/i 65mm and 75mm lenses (via the Cooke 75mm adaptor). The design of this accessory is based on the Cooke PS945 soft focus lens for 4x5 large format photography. You can see the effect in the example photos taken with the PS945 lens. The effect is high resolution with beautiful glow in the highlights - subtle, but more pronounced at wide open aperture at T2, becoming less pronounced when the aperture is stopped down. (Effect from T2 to T4 with the 65mm lens; T2 to T5.6 with the 75mm lens.)nnCooke S4/i Lens Awardsnn1998 Cinec Award for Technical Excellence, Germanyn1999 Academy of Motion Picture Arts and Sciences Award for optical and mechanical designn2000 Primetime Emmy Award for Outstanding Achievement in Technical Developmentn2001 Two Queen's Awards for Enterprise - International Trade and Innovation, Englandn2001 Winner, Exporter of the Year, 2001 International Business Award, Export Times and Trade Partners UKn2001 Winner, Product Innovation, 2001 International Business Award, Export Times and Trade Partners UKn2007 NAB2007 Premiere Product Award - S4/i Systemnnn- Maximum format coverage -- 30mm diameter (Super 35mm format)nn- Focus scales -- Two opposing focus scales - metric or imperial. Scales graduated from infinity to minimum focus distance.nn- Focus gear -- 140 teeth metric module 0.8 x 6.0mm wide x 98mm from image plane. 140 teeth module 0.8 x 6.0mm wide x 99mm from image plane (300mm)nn- Iris scales -- Two opposing linear T scales - full and third stop graduations.nn- Iris gear -- 134 teeth metric module 0.8 x 4.0mm wide 79.5mm from image plane.nn- Front internal filter -- Internal thread for M105 x 0.75 pitch filter adaptor (not applicable for 12mm and 14mm). M120 x 1.0 pitch (150mm). M131 x 1.0 pitch (180mm, 300mm)nnKey Features

nnOptical Design -- The optics are designed to deliver maximum performance at full aperture with superior control of flare, distortion and spherical aberration.nnElectronics -- Accessible via the PL mount contacts that synchronise with /i compatible cameras.nnColour Balance -- All S4/i prime lenses are colour balanced, matched and compatible with Cooke 5/i, miniS4/i and Anamorphic/i.nnAperture -- All S4/i prime lenses have a true T2 aperture and cover Super 35mm format, except for the 300mm (2.8).nnIndex Marks -- Each index mark is labelled. More detailed graduations enable more precise focus control.nnFocus Movement -- Our Academy Award®-winning cam focus system, combined with the additional advantage of a large lens barrel diameter, has enabled an increase in the number of focus marks, particularly for close focusing. Spherical aberration has been controlled throughout the focal range to eliminate compensation for back focus changes with aperture. A four-point contact bearing ensures smooth, positive and backlash-free movement.nnCamera Mounts -- Reinforced Cooke PL mount with /i Technology contacts.nnFocus Scale -- Large clear numbers on both sides of the focus barrel assist the focus puller when shooting in difficult lighting conditions. In addition, the entrance pupil position is engraved on the lens.nnCompatibility -- All Cooke S4/i prime lenses have a common fixed front diameter of 110mm, (except for 12mm, 150mm, 180mm, 300mm) with a 140T x 0.8 mod focus gear and a 114T x 0.8 iris gear

External Finish -- All Cooke lenses feature a scratch-resistant PTFE hard anodised finish, providing a durable and wear-resistant surface to meet the most demanding environmental conditions.nnIris -- An eight-blade linear iris assembly is integrated into S4/i prime lenses with an aperture range from T2 to T22. (Except for the 300mm)nnWeight/Size Ratio -- The lenses are designed for all shooting applications, including handheld and Steadicam, offering a comfortable balance ratio with the latest compact cameras.n

Reliability and Service -- The S4/i prime lenses are designed to meet market demands for totally reliable performance with minimal downtime.