Published in Autumn 2005 Zeiss Historica Journal
Author: Peter Wallage
See Pages 10 – 15
The author ponders if Zeiss Ikon would have made a Retina like camera had Nagel remained with the firm. He also contributes a history of Nagel and his efforts before and after his days at Zeiss Ikon.
To go to the Journal itself, click on the year 2005 in the first line above.