There is an ocean of cheap monorail cameras on the used market but it is hard to get info about them. I am looking for one that will let me use a 47/58 (flange distance = 70mm) on a flat board. I have large fingers and old eyes, and life is too short to use dental mirrors to set lenses. I would like more precision and rigidity than the Shen-Hao, and am willing to deal with the weight. Cheap would be really nice, but is not essential. I am not looking at the Fotoman yet because I would like something to use my 90 on as well, and it really needs a lot of movement.