Some time ago I was roaming around the web and stumbled upon a site with a number of
"pdf" files on Bronica Lenses (and one on Polaroid Backs).
I have copied the files for my own use, but since the files are not my own,
I will list the file titles along with the web address...
I'm confident that although you may not own the "exact" lens in any of the articles, you will gain
knowledge on the workings of them. I know the info is not all encompassing but, I expect there will
be a fair overlap on the mechanical design of the wide range of Zenzanon lenses.