Tessar
Appearance
The Zeiss Tessar is a famous photographic lens design conceived by Paul Rudolph in 1902.
The Tessar is an evolution of the Cooke Triplet design.
A Tessar comprises four elements in three groups, one positive crown glass element on the front, one negative flint glass element at thee center and a negative flint glass element cemented with a positive crown glass element at the rear.