Cooke mini S4/i 25mm T2.8

Cooke mini S4/i 25mm T2.8

The miniS4/i Primes (T2.8 to T22 aperture) incorporate everything that today's filmmakers ask for: smaller, lighter-weight lenses that offer the same resolution, optical quality and reliability as the S4/i lenses at T2.8 speed. With the speed of the new digital cameras, T2.8 is the new, economical T2.0.

The Cooke Mini S4/i’s are interchangeable with the S4/i and 5/i lenses for shooting film and digital images up to and beyond a 4K resolution. Current Mini S4/i focal lengths are 18, 25, 32, 40, 50, 65, 75, 100 and 135mm.

Featues

Maximum Format Cover: 33.54mm Diameter (New Epic S35mm Format)
Focus Scales: Two opposing focus scales - metric or footage. Scales marked from infinity to MOD
Focus Drive Gear: 121 teeth 0.8 metric module x 5.0 wide x 104 from the image plane
Iris Scales: Two opposing linear T scales - whole and third stops marked
Iris Drive Gear: 119 teeth 0.8 metric module x 2.5 wide x 84 from image plane

Technical data

T-Stop Range T2.8-T22
Angular Rotation of Iris Scale 77°
Min. Marked Object Distance 250 mm
Close Focus from Lens Front 80 mm
Angular Rotation to MOD Endstop 300°
Max. Diagonal Angle of View for Super 35 Format 62°
Length from Front of Lens to Lens Mount 106 mm
Max Front Diameter 87 mm
Total Weight 1.40 kg

Main Features of Cooke's Lenses

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 miniS4/i prime lenses are colour balanced to a specification within parameters approved by Kodak
Aperture
All miniS4/i primes have a true T2.8 aperture and cover Super 35mm format
Index Marks
Every index mark is labelled. More detailed markings allow for more detailed focus control
Focus Movement
Cooke's 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
Arriflex 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 miniS4/i primes have a common fixed front diameter of 87mm, with a focus drive gear of 121T x 0.8 mod and an iris drive gear of 119T 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 miniS4/i primes with an aperture range of T2.8 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
miniS4/i prime lenses are designed to meet a market requirement for fully reliable performance with a minimum of downtime