Mark your lens is missing the Waterhouse stops(Do a search as there is a bunch of threads on the subject). In short the early lenses had a slot cut in the barrel & the lens came with a set of stops that slide in this slot. Very accurate but often missing. I got kind of lucky with this one as it has a full set. You will find that they are not difficult to make yourself. Again, do a search on Waterhouse stops Making them, calculating stops & just about any info you will need. It has already posted in a thread.
I would willing to scan them & email them to you sometime next week. This way you could use them for a template & have the original sizes in the Voigtlander set.
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