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Cooke 28mm True Lens Services Speed Panchro S1 T2.2 - PL Mount

Cooke Optics
Abel Code: 28s2TLS
Description
This re-housed Cooke 28mm Speed Panchro S1 features a max. aperture of T2.2, close focus at 8", uniform 110mm front diameter, and a precision PL Mount.
Key Highlights
  • 25mm T2.2 Prime
  • MOD: 8"
  • 110mm front OD
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Overview

Overview

The Cooke 28mm True Lens Services Speed Panchro S1 T2.2 - PL Mount is a re-housed prime by TLS, following in a rich tradition of optical excellence established by Cooke. A standard by which other prime lenses were measured between the 1930’s and 1950’s, the Cooke Speed Panchros were estimated by George Eastman to have captured approximately 90% of 16mm films shot during that time in America. After an intensive design and development process, the TLS team developed and refined a brand new housing that adds modern functionality to an archaic form without losing the “Cooke Look”.

The Upgrade Process 

Performance

With imperceptible backlash in the focus movement, zero image shift and smooth transition of the optical unit within the lens housing, the TLS re-design has become a significant standard by which re-housing processes are measured.

Focus & Iris Ring

Positive stops on the focus ring are designed to withstand the rigors of modern drive systems that can often overrun the frail end stops from some earlier re-housings. Using a similar setup up to the Cooke S4, the iris ring is freely rotatable on the main body of the lens and set on a pair of split bearing rings that keep the two components apart. The iris ring is also governed and designed to stop cleanly at either end of the scale. 

Aperture

Internally adjustable stops on the iris aperture ring mean that the lens can be set to overrun the end markings, if required, but this will not necessarily mean that the lens will open or close any more than the original specified settings.

Mount

The shimmable stainless steel PL Mount retains the iris datum ring, using eight cap head screws.

Cam Groove

The variable pitch cam that guides the optical unit gives the focus puller an even spread of the focus scale around the circumference, which is particularly useful towards infinity.

The cam groove inside the focus barrel has been calculated and cut to give a constant acceleration of the optical unit along the barrel during its rotation. Machining the two-part, spring-loaded cam follower that runs along the cam is an intricate operation which is critical to gain the correct ‘feel’ of the finished lens movement.

The same can be said for the machining of the cam groove with surface finish, produced to give a smooth movement of the optical unit within the housing. The entire focus movement is designed to give reliable, repeatable, progressive and constant performance throughout its working operation. The internally adjustable focus stop gives a clean, solid halt to the travel at either end of the scale. Once set, it must hold its position as it is matched to the cam groove and focus scale on the outside. Spring-loaded support bearings on the internal carrier help give the optical unit a smooth and cushioned ride along the inside the lens barrel.

Focus Barrel

The focus barrel is held on a specially designed bearing that eliminates shake and play from the focus movement in the focus barrel. This is a key component to the whole re-housing.

Focus Gear & Iris Drive

Externally, the focus and iris drive rings both have 0.8 MOD drive gears that will be the same size and in the same position throughout the whole range of Speed Panchro re-housings.

  • Focus gear has 140 teeth, 0.8 MOD
  • Iris gear has 120 teeth, 0.8 MOD

Front Diameter 

The front diameter is 110mm and can accept standard mattebox clamp rings and doughnut adaptors, without affecting the focus movement. The front diameter of the lens has been set at this dimension to ensure that no vignetting takes place in the corners of the Academy format, which the original Speed Panchros were designed to cover. 

The front internal filter thread is 105mm x 0.75 pitch to accept standard filters of that diameter. Deep internal re-icing on the inside of the front carrier helps reduce internal reflections in difficult lighting situations.

 

The Results 

Made from stainless steel, brass and aircraft grade aluminium, the entire lens is now brought up to current specifications. You can now capture that “Cooke Look” with confidence that a modern housing will allow these lenses to withstand the rigors of modern production.

Given the reliability and solid construction of the Cooke Speed Panchro conversions, TLS has now moved on to re-housing other classic, vintage lenses from both Kowa and Bausch and Lomb. Future developments include the conversion of the Canon K35 series, alongside other suitable manufacturers’ lenses, which are constantly being appraised for conversion suitability.

 

Specifications:

  • Nominal Focal Length: 28mm
  • Max. Aperture: T2.2
  • Min. Aperture: T22
  • Min. Distance (Scaled): 8"
  • Front Diameter: 110mm
  • Overall Length: 2.7" (68.5mm)
  • Weight: 2 lb (0.9 kg)

 

What's in the Box

  • 1 x Cooke 28mm Series II Speed Panchro T2.2
Specifications

Specifications

Key Highlights

  • 25mm T2.2 Prime
  • MOD: 8"
  • 110mm front OD
  • PL Mount

Lens Characteristics

Prime or Zoom:
Prime
Lens Mount:
PL
Focus Scale:
Feet
Filter Thread Size:
105mm
Fixed Focal Length:
28mm
Front Diameter:
110mm
Max Dimensions (Diameter x Length):
110mm x 2.7" (68.5mm)
Aperture Range:
T2.2 to T22
Minimum Focus Distance:
8"

Support for Every Production

Facilities in NY & LA designed for maximum comfort and efficiency

We are accustomed to working with productions and budgets of all sizes. Need a complete camera system specifically tailored to your needs or a few accessories to complete your kit? We’ve got you covered. All our gear is meticulously maintained by our on-site technicians, and we treat all jobs with the highest degree of care and attention to detail.

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