Zeiss (Olympia) Sonnar 180mm f/2.8 Kadlubeks Objejektiv-Katalog CZP0100 & Nikkor-P 180mm f/2.8 Kadlubeks Objejektiv-Katalog NIK3090 Introduction The glorious history of the Carl Zeiss Olympia Sonnar made for the infamous 1936 Olympic Games is well known, or should be ( e.g., http://www.cameraquest.com/oly180.htm ). "The Zeiss Olympia Sonnar 180mm f/2.8 for the Contax II (both 1936, Germany) is a classic, if not mythic, example." it says in the Wikipedia article on lens design. Examples at http://www.mir.com.my/rb/photography/companies/nikon/nikkoresources/RF-Nikkor/Contax_RF/ContaxRF180mmf28OlymSnar.htm , other links: http://forum.photozone.de/index.php?/topic/2434-legendary-carl-zeiss-jena-olympia-sonnar-t-180mm-f28-lens/ , http://www.photo.net/classic-cameras-forum/00MjXJ ) As the images at the Cameraquest page linked to above show, the size of the 1936 Sonnar is surprisingly comparable to the Pentacon 6-mount lens that I am discussing and comparing here. That same article also claims that the post-war Western Zeiss longer Contax lenses were actually made in Jena. We can simply say that the 'break' was gradual and related to the increasing control and then ownership by the state in the East. (also see http://www.cameraquest.com/olymp180.htm ) I earlier posted a couple of pictures taken with my P6-mount version of the Zeiss Sonnar 180mm f/2.8 on my Pentacon 6TL ( http://www.photo.net/classic-cameras-forum/00Pqzu ). In some later discussion, someone chimed in that their Olympia Sonnar was made by Nikon. So I was a little curious about that Nikon Nikkor-P 180mm f/2.8. Below is the original formula for the Olympia Sonnar on the left, with the Nikkor-P design on the right.