Hi,
I was intrigued when I saw one or two identical focal lengths
that were manufactured for Copal 0, and also for Copal 1.
Both had a maximal aperture value of f/5.6
What is the difference between two lenses made for shutters
with different sizes, like Copal 0 and Copal 1?
Is it because of format size? Because I think I have seen
a 240mm. and 360mm. lenses in Copal 3, meant apparently
for 8x10 format. And I have also seen the same focal
lengths, but with a much more luminous aperture value like f/5.6,
and I think, those are for smaller formats like 5x7, and 4x5.
I might be wrong, however.
Thank you in advance, kind regards,
Ig
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