Maybe for some of you its for interest : The carl zeiss archive allowed me to put some zeiss papers from the archive on my website, the 1938 Riflescope catalog and the 1936 assembling guide for zielvier, zielsechs, zielacht and zielmulti.

take a look : http://www.jagdwaffensammler.de/index.php?id=79

i think real interesting for the serious collector.