My Toho FC-45X has a very small amount of play in the default detent positions. As a result, the standards can be slightly out of alignment. It is easy to check, using a torpedo level, that the standards are vertically aligned, but I've had some difficulty checking that they are horizontally aligned. I finally came up with the following method. I put the rail assembly on my tripod and turn the tripod so that it is roughly vertical. I have a small bubble level with a protuding margin, and I clamp it to one of the standard supports. I then adjust the tripod and the rail assembly so it is level. I then clamp it to the other standard support and note how far out of level that is and in which direction. I then make minor adjusments in the detent positions for tilts and swings, front or rear or both, until I can get them both level. This can sometimes take a bit of fiddling, but once I have it set, I can leave it that way until I use a tilt or swing, at which time I have to readjust them again. It is pretty quick just to check alignment if no adjustments are needed.
Of course, one can also make adjustments by looking at the gg and looking at detail on either side or top and bottom at roughly the same distance (optically). But this method avoids having to mount the standards.
The alignment errors for the Toho are not very large, and most of the time will be taken care of by DOF. But I do find that they sometimes can result in out of focus regions for short focal length lenses. I wonder what experiences other have had in this regard with a Toho or indeed any view camera designed to be used easily in the field.
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