I've been using the Zone VI 4x5 since I purchased it (new) in 1997. I'm not sure what "vintage" it is. I've been quite happy with it, and have learned to work around its weaknesses, which have been discussed elsewhere on this forum. As Mae West used to say, "It's a poor craftsman who blames his tool." Anyway, I've just learned of a very interesting design issue that I did not see mentioned on this forum. One of the most difficult things for me is to compose a photograph without horizontal convergence. This past week I was photographing inside of a large rectangular room. I had myself positioned exactly half way along the longer wall (I measured carefully). I had all of the controls square and centered, and the back perpendicular to the ground. Using a 58mm lens and the bag bellows, I was photographing the opposite wall. I panned the camera until the opposite wall was centered in the ground glass, and discovered that the floor and ceiling lines converged quite noticably. I checked that the lens was not off-center, and I checked that I was in the center of the wall. And yes, the room was square. Since I had such a short lens and the bag bellows, I was unable to slide the lens sideways enough to correct the problem, so I panned the camera until the convergence disappeared, and made the exposure. I'll plan on cropping the image to be symetrical. Back in my studio this morning, I got out my dial caliper that reads to 0.01 inch, and began to check the dimensions of the camera. To my great surprise, I discovered that my ground glass is off-center by 0.14 inch when the back is in the horizontal position. Looking from the back of the camera with the film holder oprning facing right, it is off center to the right. If I rotate the back 180 degrees, it's off center to the left. From previous testing I know that the visible area of the ground glass closely agrees with the image on the film, and that the focal plane of the ground glass is also the same as the film. Has anyone else seen this with the Zone VI camera (or any other LF camera)? Now I know it's there I can compensate for it, which I'm sure would make Mae West happy.