Lens Board Openings?

maxbloom

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• Oct 4, 2008

• #1

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

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• Oct 4, 2008

• #2

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

Jon

 

OP

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maxbloom

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• Oct 4, 2008

• #3

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

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• Oct 4, 2008

• #4

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)

 

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maxbloom

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• Oct 4, 2008

• #5

That hurts my head, unfortunately.

 

resummerfield

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• Oct 4, 2008

• #6

maxbloom said:

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

Click to expand...

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

 

ic-racer

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• Oct 4, 2008

• #7

maxbloom said:

That hurts my head, unfortunately.

Click to expand...

The formatting got removed.

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.