Cooke 5/i Prime Lenses

Cooke 5/i Prime Lenses were designed and developed in close technical collaboration with industry professionals. They are colour-matched and compatible with Cooke S4/i, Panchro by Cooke, CXX 15-40 mm T2 S4/i Zoom, 18-100mm T3.0 and 25-250mm T3.7, and the SK4 16mm lenses.

Cooke 5/i 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.

18, 25, 32, 40, 50, 65, 75, 100, 135

 

/i Technology

All of our 5/i Prime lenses are supplied with /i Technology, and are designed for all PL mounted professional motion picture film and electronic cameras. /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.

For companies interested in producing compatible products with /i Technology, the /i protocol is available as a free download: Get the latest /i Communications specs in PDF format under Technical Resources, Free downloads.

 

 

Features
Optical Design	The optics are designed to give maximum performance at full aperture with superior control of flare, distortion and spherical aberration.
/i Electronics	Accessible via cable connector near the lens mount and contacts in mount that sync with /i compatible cameras.
Colour Balance	All Cooke 5/i prime lenses are colour balanced to a specification within parameters approved by Kodak.
T1.4 Aperture	All Cooke 5/i primes have a true T1.4 aperture and cover Super 35mm format.
Index Marks	Every index mark is labelled. More detailed markings allow for more detailed focus control.
Focus Movement	Our Academy AwardŽ 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.
Focus Illumination	The dimmable focus ring illumination toggles DP and/or assistant focus scale illumination providing operational advantages in low lighting conditions. Illumination options are controlled on the lens or via an external controller.
Camera Mounts	PL Mount
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 5/i primes have a common fixed front diameter of 110mm, with a focus drive gear of 140T x 0.8 mod and an iris drive gear of 134T 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	A seven-leaf linear module iris assembly is fitted into the Cooke 5/i primes with an aperture range of T1.4 to T22.
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	Cooke 5/i prime lenses are designed to meet a market requirement for fully reliable performance with a minimum of downtime.

 

Cases Available

Cooke 5/i Data Sheets (pdf)

 

5/i range of lenses

Specifications
	Units	18mm	25mm	32mm	40mm	50mm	65mm	75mm	100mm	135mm
T-stop Range		T1.4-T22	T1.4-T22	T1.4-T22	T1.4-T22	T1.4-T22	T1.4-T22	T1.4-T22	T1.4-T22	T1.4-T22
Angular Rotation of Iris Scale	degrees	90	90	90	90	90	90	90	90	90
Miniumum Marked Object Distance	mm inches	350 14	350 14	350 14	450 16	500 20	600 24	650 27	750 30	800 31
Close Focus from Lens Front	mm inches	125 5	121 5	121 5	171 7	271 11	370 15	421 17	515 20	531 21
Angular Rotation to MOD Endstop	degrees	270	270	270	270	270	270	270	270	270
Maximum Diagonal Angle of View for Super 35 Format	degrees	79.3	61.9	50.5	41.0	33.7	26.1	22.6	17.1	12.68
Length from Front of Lens to Lens Mount	mm inches	175 6.89	177 6.97	177 6.97	177 6.97	177 6.97	177 6.97	177 6.97	183 7.20	217 8.50
Max Front Diameter	mm inches	110 4.33	110 4.33	110 4.33	110 4.33	110 4.33	110 4.33	110 4.33	110 4.33	136 5.35

Maximum Format Cover	30mm Diameter (Super 35mm Format)
Focus Scales	Two opposing focus scales - metric & footage. Scales marked from infinity to MOD.
Focus Drive Gear	140 teeth 0.8 metric module x 5.0 wide 102.5 from the image plane.
Iris Scales	Two opposing linear T scales - whole and third stops marked.
Iris Drive Gear	134 teeth 0.8 metric module x 2.5 wide x 82 from image plane.