flavio81
Well-known
The West German Sonnar has a ring around the barrel. Take the barrel out of the mount by removing the retaining ring. Once the barrel is out, you will see the stand-off ring. This takes the place of a shim, simply unscrew it to increase the stand-off.
So with "stand-off" you mean the distance between the lens barrel vs the objective itself. Understood, thanks Brian. I've seen either Helios-103 or Jupiter-8M lenses with the same kind of ring too (can't remember which).