The ruler on the Tachihara field camera bed (mine's a 4x5) divides each centimeter into 4 sections, so each is 2.5 mm. With the near-far point DOF determination method (https://www.largeformatphotography.info/fstop.html), this is sort of okay, but I've finally gotten around to making a mm scale, not immediately finding one on the web that fit. I have made it 8 cm long, printable. I'll use stick on laminate and probably double-stick tape for attachment. I have an arrow that moves with the bed now.
I made one going each direction; I use the first. The 8-cm length, if tightly trimmed, avoids interference when the back moves forward.
I'm attaching it here in case anyone may find it useful. It's possible that some printer drivers will alter the size slightly. Sorry if it happens to you; you may be able to adjust.
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