copal

Also a Japanese manufacturer of leaf shutters for large- and medium-format camera lenses. The Copal size scale for shutters has pretty much become the de facto standard in the past 15 years or so since their introduction. In a large format setup, the shutter is mounted in a lensboard and the lens screwed into the shutter on both sides. Copal shutters usually come in sizes 0, 1 and 3 though size from 00 through 3 are apparently out there. Usually you can buy a lensboard with a hole pre-drilled in any size. However, if you can't find a board ready-made, it will be necessary have an incredibly expensive hole put into the exact center of your incredibly expensive square of wood. Your best bet at that point is to find a local machine shop to do this for you, seeing as how "kinda close" is usually just close enough to ruin your lensboard and any film you put in the camera.

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Just in case you are considering having a board drilled locally, I've included the appropriate sizes in "Copal" and the corresponding diameters in millimeters(originally from www.schneideroptics.com):

• Copal 0: 34.8mm
• Copal 1: 41.8mm
• Copal 3: 65.3mm

Co"pal , [Sp., fr. Mexican copalli, generic name of resins. Clavigero.]

A resinous substance flowing spontaneously from trees of Zanzibar, Madagascar, and South America (Trachylobium Hornemannianum, T. verrocosum, and Hymenaea Courbaril), and dug from earth where forests have stood in Africa; -- used chiefly in making varnishes.

Ur.

 

© Webster 1913.