Quote Originally Posted by Dan Fromm View Post
E, have you seen a Sonnar cross-section? 6 air-glass interfaces, the same as the highly flare-resistant Tessar.
Yes I have. I've also used coated and uncoated Tessars, I much prefer the coated ones. Dagors, Protars, and Rapid Rectilinears are about the only uncoated lenses I've used which I like, all have two internal surfaces rather than the Tessar's four.