You may have a Copal 3S shutter, not the Copal 3 that the Commercial Congo 360mm f/6.8 lens needs. Confusingly, some 3S shutters are marked 3. The 3S has 56mm threads, the 3 has 58mm threads.
Kumar
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Yes, Copal 3S for mine. But indeed it just says "Copal 3."
Err no! From advice I received on this thread I tried a copal 3s, too small, so I purchased a copal 3, still too small. Unless of course there are three different sized copal 3?? Perhaps I'm just climbing the ladder
That's it for Copal 3 shutters. Perhaps it's time for a Packard shutter behind the lens. Just leave it in the barrel.
I got my information here: http://www.jck.net/congo/frame_e.htm which says you need a Copal #3 shutter. There are only two Copal 3 sizes - 3 and 3S, of which the latter is confusingly named 3 occasionally. Iif you could measure the lens cell threads it would help.
Kumar
Hi Kumar, Yes you can see the difference In size between the two I have, both a copal 3s (marked as copal 3) and a copal 3 which is I believe is 2 mil larger thread and 2.4 mil thicker? I have made a shutter out of a speed graphic cut in half, my go to shutter for larger lenses, takes everything including a 16 inch ross portrait petzval. It accepts a deardorff lens board.
Andrew, what I meant was that if you can tell us the measurements of the lens cells, someone here would probably know in which shutter they would fit.
Kumar
My Osaka Commercial 360mm lens is in a shutter clearly marked Copal - No. 3s.
I don't know why Copal didn't mark all their 3s shutters. It's a bit silly and confusing.