lensboard hole

[Daniele Minetto]

Can somebody tell me who's right?
Lensboard hole for a copal #3 shutter: Schneider Kreuznach site: 65,3 mm / J.C. Barnaud on L.F site: 64,2 mm / R. Baker on L.F. site: 65,00 mm .....????? WHAT is the RIGHT size? And what about tolerance?

[Richard Kelham]

I don't have any size 3 lenses at the moment, but I do have a spare lens board for my Linhof awaiting the day...

The hole in that is 65.0mm.

[Matt Miller]

65mm is what I use.

[Scott Davis]

you're talking about a 1.1 mm difference between smallest and largest. All three sizes are well within tolerance. Don't sweat it. I drill my own lensboards for my 8x10, and I've gotten within 2-3 mm of actual size due to various issues. As long as the hole is not so big that the lens is flopping around in it, or it is leaking light, I wouldn't sweat it.

[BrianShaw]

All of the above!

[tim atherton]

http://www.skgrimes.com/lensmount/shutmt/index.htm

[Stan. Laurenson-Batten]

I cut my own boards. The Copal #3 to 65mm or 2.559 inches. No wobble and snug fit.

[Ron Marshall]

Here is a chart: http://www.largeformatphotography.info/lensboard_hole_sizes.html

[Michael Graves]

So where does one find a 2.5559" hole saw?

[Ralph Barker]

"So where does one find a 2.5559" hole saw?"

You drink a 4-shot latte before using a 2.5" hole saw. ;-)

The chart I compiled for the home page includes the nearest fractional sizes. From there, it's a matter of sanding or filing to fit. Forstner bits tend to be available in closer sizes than hole saws, and produce much cleaner edges. But, the forstner bits only work on wood or plastic, not metal.