Lens Board Openings?

[maxbloom]

Can someone translate please? I'm looking for some boards for a Cambo 4x5 I just bought...KEH has sizes listed as 41, 42, 52, and 65. I'm used to seeing copal #'s.

[Jon Shiu]

Hi, you can get the copal sizes at skgrimes.com or do a google on copal shutters.

Jon

[maxbloom]

Still not completely understanding based on the grimes list. Is 41mm or 42mm the #1? grimes lists #1 as 41.8/41.6.

[ic-racer]

dimensions in mm Copal 0 Copal 1 Copal 3

1/board mounting thread M32.5x0.5 M39x0.75 M61.0x0.75
2/flange ring diameter 34.6 41.6 64.0
3/board hole diameter 34.8 41.8 64.2
4/front lens cell thread M29.5x0.5 M40.0x0.75 M56.0x0.75
5/rear lens cell thread M29.5x0.5 M36.0x0.75 M56.0x0.75
6/front to rear cells flange 20.0 +-0.025 20.0+-0.025 28.6+-0.025
distance
(M32.5x0.5 means : diameter 32.5mm, length of one thread 0.5mm = 2 threads per
mm = roughly 50 tpi, angle 60 degrees)

(From the LF forum pages)

[maxbloom]

That hurts my head, unfortunately.

[resummerfield]

Still not completely understanding based on the grimes list. Is 41mm or 42mm the #1? grimes lists #1 as 41.8/41.6.

For what its worth, I have a Wista #1 board with a 42mm hole.

[ic-racer]

That hurts my head, unfortunately.

The formatting got removed.:o

Anyway the chart tells us that the hole opening is 41.8mm and the flange that will fit in the hole is 41.6mm, so there is a little slack. So, go with resummerfields 42mm.