Shutter Sizes : LUSENET : Large format photography : One Thread

Can anyone tell me what size lens board hole corresponds to the current three shutter sizes? The hole sizes I got from the last big Calumet catalog are:

0 = 34.8mm 1 = 41.8mm 3 = 65.3mm

But those selling lens boards on ebay report all sorts of odd ball hole diameters. Or maybe the Calumet numbers refer to something else.


-- John Hennessy (, February 20, 2001


The numbers you list are correct. In addition to the three sizes you list, S.K. Grimes lists 64.1 mm for the Copal 3S shutter (

As to why some lensboards have different size holes: older shutters had a larger variety of mounting holes. Also, some people who make their own holes do a pretty crude job. Some don't know that the projection on the retaining ring is supposed to go into the hole and consequently make an undersized hole.

-- Michael Briggs (, February 20, 2001.

Those no doubt are the correct sizes but small variations don't hurt anything. For example a 39 mm hole will work with a Copal 1 shutter.

-- Brian Ellis (, February 20, 2001.

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