I think that is the heart of the problem and why I asked that question. I know my camera has both detents and bubbles, and they are slightly out of agreement... but the lensboard and GG are in very close alignment. I could not measure the difference without employing specialized tools, and the difference (if any) doesn't show on the GG. But when setting up the camera I level by "averaging" the bubbles on the front and back standards. So there is nothing to worry about, right? Why worry about the theoretical when it has little-to-no impact on the practical. If I ever had a camera where the standards were visually out of whack... I'd get rid of it. I've never used a "modern" view camera that hasn't been abused that has ever had an apparent alignment problem. The factory detents may not be absolutely perfect but they always seem good enough" to me.
Originally Posted by Michael R 1974