I recently bought yet another Toyo monorail (a D45M this time) via that famous on line auction site. Included with the deal was a Rodenstock 180mm f/5.6 Sironar in a #1 Synchro Compur. I cleaned the slow speeds escapement which got the shutter working correctly and shot some test images. The end result, I like the lens.

There is a ton of information about the Sironar-S and Sironar-N available, but I can't seem to find anything about the plain old Sironar. Can anyone clue me in as to the design of the lens (elements/groups) and other specs such as coverage angle and image circle?

TIA