I'm racking my brains to undertsand why such precise alignment is required unless you are doing scientific work? I'd have thought just eyeballing the square alignment of the standards would be sufficient in order to not have converging this or that, if the camera was also set square on the tripod. True close up's and wide aperture photographs may need a more precise alignment, but wouldn't you do that via the ground glass screen and empirical knowledge about what is going on rather than trusting to a camera setting?