Hello all,
I'd like to ask how shutter iris sizing came about. The Copal 0 size has an iris opening of around 452mm2, Copal 1 - 706mm2 and Copal 3 - 1590mm2.
What's the relationship between the sizes? It is the sqrt 2 for example...
Is it a artefact of the Japanese copying a German design that adapted a French baguette or something?
Here in Aus we have a rail (train) network where the gauge is so because that's how wide the cart wheels were ... !! I think its the same in the US. So many things are so because they are just copies of older designs rather than having a specific physical design problem to solve.
Cheers,
Steve
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