Cooke Series XVa Triple Convertible

4 July, 2008

Cooke Optics Ltd.
Cooke Close
Thurmaston
Leicester, LE4 8PT
United Kingdom
T +44 (0) 116 264 0700
F +44 (0) 116 264 0707
lenses@cookeoptics.com

We have temporarily suspended production of our large format lenses. Watch here for production updates.

The same classic lines, format and focal length combinations as the original Cooke Series XV lens. Cooke's redesign of this still popular classic maintains the favorite characteristics of the original lens while incorporating new features requested by contemporary photographers:

Cooke Series XVa Triple Convertible Lens

For 8 x 10 large format photography

Focal lengths: 645mm (front cell only), 476mm (back cell only), 311mm (front + back).

Color balanced for today's film stocks.

Renowned Cooke multicoating. No flaring. No ghosting.

Dynamic Scale Ring. Three easily readable f stop scales on one dialable ring for the three lens combinations (front + back, front only, back only). The ring easily attaches to any recent vintage Copal #3 shutter in good condition.

Combine your first XVa lens with a second XVa lens for two additional focal length combinations: 365mm (front + front) and 271mm (back + back).
The lens can be supplied with or without a Copal #3 shutter. Your choice:

(1) use an existing recent vintage Copal #3 shutter in your lens collection or purchase a new Copal #3 shutter locally (to avoid paying an additional markup. We do try to help.) The Dynamic Scale Ring is included with your purchase and attaches easily to your existing shutter (instructions included).

(2) Purchase the lens with a shutter and it will be delivered with the Dynamic Scale Ring already attached.

(3) If you choose to purchase a second Series XVa lens set to take advantage of the five possible focal length combinations, we have a Dynamic Scale Ring with all five f stop combinations available to assemble to your shutter.

Cooke Series XVa Convertible Lens Comprehensive Specifications for Five Possible Focal Length Combinations
	Front + Back	Back	Front	Back + Back	Front + Front
Focal Length	311mm/12.25 inches	476mm/19 inches	646mm/25.5 inches	273mm/10.75 inches	368mm/14.5 inches
Aperture Range	f/6.8 to f/90	f/11 to f/90	f/16 to f/90	f/5.6 to f/90	f/8 to f/90
Format	8x10 inch	8x10 inch	8x10 inch	8x10 inch	8x10 inch
Diagonal	325mm/12.75 inch	325mm/12.75 inch	325mm/12.75 inches	325mm/12.75 inches	325mm/12.75 inches
Angle of View	55 degrees	38 degrees	28 degrees	61 degrees	48 degrees
Maximun Useable Image Circle (Angle of View) (Use Aperture)	381mm/15 inches 63 degrees (f/16)	452mm/17.8 inches 51 degrees (f/32)	452mm/17.8 inches 39 degrees (f/32)	324mm/12.75 inches 61 degrees (f/16)	420mm/16.5 inches 60 degrees (f/16)
Maximum Useable Image Circle at 10 Feet and Less (Use Aperture)	420mm/16.5 inches (f/16)	452mm/17.8 inches (f/32)	452mm/17.8 inches (f/32)	360mm/14.2 inches (f/16)	460mm/18 inches (f/16)
Flange Focal Distance	312mm/12.28 inches	542mm/21.34 inches	733mm/28.86 inches	270mm/10.64 inches	367mm/14.44 inches
Filter Size	77mm screw in Front Cell 62mm screw in Back Cell 62mm screw in Gold Ring (shutter front)
Location Bore in Lens Board	65mm Standard for Copal #3 Shutter
Overall Length	85mm/3.35 inches (Front + Back)
Weight	0.93kg/2.05 lbs. (with Front + Back)
External Finish	Semi-gloss black anodised, with textured gold bevel ring