Out of curiosity, How do you go about setting up the scale focusing on your camera? I attached an old Wollensak 90 on my 3A tonight. I used a old piece of ground glass to focus with the back removed. But with roll film, I can see the advantage of the focus scales.

Do you just set the camera up on a tripod and focus on objects at various distances while recording the lens position, or is there another way to do it more easily?