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Large format lenses

Cooke Series XVa Convertible

Comprehensive Specifications for Five Possible Focal Length Combinations
Front + Back
Back
Front
Back + Back
Front + Front
Focal Length
311mm/12.25 "
476mm/19 "
646mm/25.5 "
273mm/10.75 "
368mm/14.5 "
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
Angle of View
325mm/12.75 "
55 °
325mm/12.75 "
38 °
325mm/12.75 "
28 °
325mm/12.75 "
61 °
325mm/12.75 "
48 °
Maximum Useable Image Circle at Infinity
(Angle of View)
(Use Aperture)
381mm/15 "

63 °
(f/16)
452mm/17.8 "

51 °
(f/32)
452mm/17.8 "

39 °
(f/32)
324mm/12.75 "

61 °
(f/16)
420mm/16.5 "

60 °
(f/16)
Maximum Useable
Image Circle at
10 Feet and Less
(Use Aperture)
420mm/16.5 "

(f/16)
452mm/17.8 "

(f/32)
452mm/17.8 "

(f/32)
360mm/14.2 "

(f/16)
460mm/18 "

(f/16)
Flange Focal Distance
at Infinity
312mm/12.28 "
542mm/21.34 "
733mm/28.86 "
270mm/10.64 "
367mm/14.44 "
Filter Size77mm 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 Length85mm/3.35 " (Front + Back)
Weight0.93 kg / 2.05 lbs. (with Front + Back)
External FinishSemi-gloss black anodised, with textured gold bevel ring

 

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