I ask this question for good reasons. The Compur shutter's changed from Dial-set to Rim-set and became standardised, that standard is still with us today with the standard shutter sizes.

But how did the Tessar lens design change, did they change the glass used in the elements. I've noticed that older Rim-set Tessars seem to have better contrast, and are less prone to flare. I should add that's based on visual observations and practical use not scientific measurements, and only based on the 5 or 6 LF Tessar's I own.

Ian