Quote Originally Posted by Carsten Wolff View Post
Will, almost all dimensions differ:

....from the skgimes site:

COPAL #3 #3s
front thread M58-0.75 M56-0.75
back thread M58-0.75 M56-0.75
overall thickness 32 mm 28.6 mm
front to iris 17.7 mm 16.25 mm
mount thread M62-0.75 M61-0.75
lensboard hole 65 mm 64.1 mm
iris dia 45 mm 45 mm

Carsten

I know this is an old thread, but I just ran across a Copal No. 3s -- which is only marked on the face as a No. 3 (apparently not unusual). Some are simply marked "Copal" with no "No." at all on the face.

Assuming it was a #3, I expected a 62mm retaining ring to fit. Since it was too wide, I assumed the shutter was a #3s. Checking on EBAY, sellers list the retaining ring as 60.5mm -- and that's what my crude measurement confirms.

I looked at S.K.Grimes, and while they have details for the #3 (and even the #2), I don't see any specs for the #3s.

And since Fuji never used the #3s, there is nothing in their literature either.

No wonder people get confused.