Lens Board Question

[Mablo]

I'm a LF newbie so please, bear with me. I'm looking for an additional flat #0 lens board because the one that comes with my camera is recessed and attached to a SA 90mm/8 lens.

I'm watching what is on offer at KEH to get an idea of price level etc. but I find description texts baffling. Here's an example:

"CAMBO SC 42 HOLE LENS BOARD" or "CAMBO SC 39 HOLE LENS BOARD".

What are numbers 42 and 39 indicating?

[Richard Rankin]

Normally that would be the diameter of the hole, in mm. You might also post in the classifieds here and find some boards.

A 42mm is a Copal 1 size, but you can see the different Copal sizes here:

http://www.skgrimes.com/lens-mounting/to-lensboard

Richard

[Gem Singer]

The numbers indicate the size of the opening in the lens board.

Assuming that you have a Cambo SC camera and need a lens board for a Copal 0 shutter, look for one with a 34-35mm opening. 39 and 42mm are too large.

[Ari]

They indicate the hole diameter in millimetres.
If I'm not mistaken, 39mm is a Seiko 0, and 42mm is a Copal 1.

Edit: just saw the others' responses.
As you were.

[Mablo]

Thanks! It's all getting much more clear to me now.