Copal #3 shutters, two sizes?

[Nicholas F. Jones]

According to the B&H website, the Copal #3 shutter comes in two sizes, the 3-585 (M62-0.75 mount thread; fits 65mm lensboard hole) and the slightly smaller 3-567 (M61-0.75 mount thread; fits 64.1mm lensboard hole).

My question is, how do you tell them apart? I do not have examples of both (SFAIK) in my physical possession to compare. I'm not even sure which of the two types are on the Copal #3 lenses that I own.

Is there a marking on the shutter? From the B&H specs it's obvious that careful measurements would distinguish the two. But I'm trying to determine the size of a shutter that I can only see in a picture.

Any help will be much appreciated.

[Nick_3536]

3 versus 3s?

[Nicholas F. Jones]

Thanks. Now that I enlarge the B&H pic for the 3-567 (and put on my reading glasses) I see the "3 S" on the front face of the housing.

[c.d.ewen]

My question is, how do you tell them apart? I do not have examples of both (SFAIK) in my physical possession to compare. I'm not even sure which of the two types are on the Copal #3 lenses that I own.

Nick:

IDK if the faceplate is a definitive indicator, but an older, silver-faced shutter I have, marked "Copal 3", conforms to the Copal 3S specs. A newer one, marked "Copal 3S", is black-faced.

The Copal 3 and 3S shutters have different lens thread sizes. See SKGrimes' table.


Charley

[c.d.ewen]

Here're all three together:

[Gene McCluney]

Yep, it's true Copal 3 shutters have been made in two slightly different sizes, in addition to the Copal 3s, which is different from the 2 versions of Copal 3.