Published in Spring 1981 Zeiss Historica Journal
Mead B. Kibbey
See Page 10.
The firm of Zeiss Ikon also produced photographic film in plate and roll film formats. The size depended on the camera and was defined by a numeric code as listed in this article. This table was further defined in a later edition of the Zeiss Historica Journal.
To go to the Journal itself, click on the year, 1981 in the first line above.