I've been using this late model, coated 9 1/2 in. Dagor lens S/N 826526 in Acme #3 shutter for many years using a cobbled together lens board adapter but would like to mount it properly at long last. I believe it's early 1960's vintage.
I can't find the information online for the thread/adapter size needed to mount on a standard lens board. Could someone please point me to this information.
Thanks,
Alan Townsend
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