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Thanks Wade !
I have contacted Steve Hopfs for a new gg
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Henk, the thickness of the ground glass is unimportant. Only the position of the surface towards the lens is critical, and that is determined by the frame and by the existance or absence of a fresnel lens. Accurately measuring the diminsion given earlier will show if a fresnel was originally used. If a fresnel was used, the ground glass can still be used without a fresnel by shimming it back about .040". Not all fresnels have the same thickness. Casually interchanging them may result in focusing errors.
Lens boards for this camera are the fairly standard 4" square boards used on many other cameras of that day. They can be built up from 1/8" plywood, MDF, or other material with basic woodworking tools and skills. They also can be milled down from the same material 1/4" thick on a table saw or router.
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