Originally Posted by Ole
The Tessar was redesigned repeatedly, all the way from the original patent to around 1980.
Whether any of these "tweaks" affected contrast and flare, I do not know.
I agree with that, but it appears there may have been a big re-compute / re-design in the early 30's. Optical glass had changed significantly allowing much faster lenses like the f2 Summar etc.
My APUG portfolio