Why would Schneider necessarily make all the barrels etc, all their camera lenses fit shutters, at that time mostly Compur or Prontor, although some for Sinar shutters are non standard.
The first Schneider made lens I saw in a composite barrel (nin metal) was actually a Vivitar 150mm f5.6 VHE, the lens cells are marked Made in Germany, and soon after that Scneider switched as well, but they may have had the barrels made elsewhere.
Deckel/Compur came up with the modern shutter standard sizes, still in use today, in 1929 so maybe they made matching barrels in the same size for Schneider,
It's a strange one, but companies s do & did sub contract, the only camera/optical company that made every single component was VEB Pentacon.
Ian


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