Published in Spring 2001 Zeiss Historica Journal
Author: Dr. Joachim Kämmerer
See Page 2 – 5
This is a presentation that the author made to the 1989 meeting of Zeiss Historica in Oberkochen where he demonstrated a series of lenses that were made in prototype form for the mentioned cameras but due to costs, anticipated difficulty in manufacturing or a sense of the market kept them from becoming production lenses. There were some significant possibilities and some surprising trademarks.
To go to the Journal itself, click on the year 2001 in the first line above.