My native (to the Wista 45SP) 135mm f5.6 Nikkor-W came with a mounting cylinder, same size as the shutter, with threads and retaining ring to fit a Wista 59mm holed lensboard. The Copal 0 has its own retaining ring for the standard Copal 0 hole. This lens was/is? standard on this camera. The cylinder places the lens about 3/8" outside the lensboard. The camera has a focusing scale for the lens on the rail. When I bought the lens from KEH the listing mentioned "Wista Mount". I deduce that for the camera's focusing scale to be accurate I have to use the cylinder (which is holed for the Copal 0on the front end) as a reverse recessed board, or a "projected board". Can anyone verify this from facts?