my studio set up with the Viso/bellows and the Tele Elmar 135
I now have a custom built flat flash adapter that allows me to use the viewfinder
the Nikon SC 17 cable does not allow the viewfinder to be mounted, so I used a slide viewer on the prism glass for focus/framing adjustments
it worked reasonably well, but using the viewfinder with the adapter is much simpler