Originally Posted by
Len Middleton
Just acquired a vintage Ross No.3 Universal that from its serial number (ca. 1875 to 1880) looks to be from the J.Stuart era, and trying to better determine its focal length, coverage, and maximum aperture. I did purchase the Lens Vade Mecum from Dan to help, but still some gaps in my understanding.
Like my Voigtlander Euroscop "1", trying to make sense of the numbering systems used and whether there is much, if any consistency comparability between manufacturers on format, as I have seen similar numbering used on Wollensak lenses, except they use Roman numerals for the values.
If not consistent, does someone have a chart of No.'s used by the different lens manufacturers?
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