Cooke 25mm SI/II Pl Conversion Only. (For lens supplied option scroll to 63/111140 below)

Product no.: 63/11114 (Type: Conversion of owner supplied lens)

Parts In Stock
can be shipped within 90 days days

Price without VAT or delivery
Delivery weight: 2.5 kg

Images shown is representitve of the product.


Service of optical unit included in conversion price  (excluding spare parts).

Built with industry standard gears for focus and iris.

Wireform™ wear free and lubricant free silent lens movement.

Very close focus capability.

All Van Diemen Wireform™ conversions are now supplied with dual iris scales as a standard feature and an 85mm front diameter, however, can also supply other larger diameters on request.

Additional product information

LENS 25mm  Cooke S1/2
Nominal Focal Length 25mm
T/No. 2.2 (f1.8)
Max Stop 22
Front Diameter 85mm-100mm &104mm options (others possible )
Length (front to focal plane) 93mm
Weight 0.6kg (1lb 5oz)
Iris Gearing Ø89mm 32DP 110 Teeth
Focus Gearing Ø89mm 32DP 110 Teeth
Angular FOV (Academy **)

80 degrees,

Specified coverage Coverage 18.37 x 24.89mm

Min Distance (scaled) TBA

Lens construction



Designed in 1931

Back Focus adjustment Shims



Van Diemen aim to deliver within 90 days of receipt of order and 50% deposit. We are unable to guarantee delivery times as they vary according to factory loading and availability of parts at the time of order.


We offer a full 2 year warranty with every Van Diemen Wireform™ product. This however does not extend to optical units on conversion products as they are supplied direct by the client.


Warranty is applicable ex works Camberley, UK. It is the responsibility of the client to cover shipping and insurance to and from Van Diemen for all product sales and warranty work.

Type Conversion of owner supplied lens

Selection: Cooke 25mm SI/II PL

Product no. Type Price
63/11114 Conversion of owner supplied lens £2,970.00 *
63/111140 Van Diemen Wireform™ (Lens Supplied) £5,250.00 *
Prices without VAT or delivery
Browse this category: Cooke Close Focus Lenses