Dan, are you sure? I ask because the Schneider catalogs I have access to -- clearly, not all -- don't mention a Compur Special shutter. This Linhof catalog
https://drive.google.com/file/d/0B50...13RTd5aDA/edit mentions a couple of lenses, not all Schneider, in Compur special shutters and explains that they have linked speed and aperture settings.
To avoid pointless wrangling, would you please tell us the diameter of y'r 121/8 SA's front cell's mounting thread? That'll answer the questions of whether it is in a standard shutter and, if so, which size.
Thanks,
Dan
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