[Arthur Macmillan]

I don't know much about lens design but I read that by cementing more elements together, reducing the number of air gaps, by using a large curvature, and asymmetric design, Sonnar was able to achieve unusually high contrast.  I've even heard some people having both coated, and uncoated versions of the lenses saying there is no contrast difference.  Apparently some coated versions were made for a time with this design at some time, bearing a red T on the name ring. 


It's such a cool little set.  Thanks for the info, and the links to photos.  I will check them out!