The Zeiss Tessar is a famous photographic lens design conceived by Paul Rudolph (physicist) in 1902.
The Tessar was not evolved from the 1893 Cooke triplet design, as commonly believed, by replacing the rear element with a cemented achromatic doublet . In fact, in 1890 Paul Rudolph designed the Zeiss Anastigmat with two cemented doublets. Later, in 1899, he took apart the doublets in the Zeiss Anastigmat to produce the four element, four group ...
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The Zeiss Tessar is a famous photographic lens design conceived by Paul Rudolph (physicist) in 1902.
The Tessar was not evolved from the 1893 Cooke triplet design, as commonly believed, by replacing the rear element with a cemented achromatic doublet . In fact, in 1890 Paul Rudolph designed the Zeiss Anastigmat with two cemented doublets. Later, in 1899, he took apart the doublets in the Zeiss Anastigmat to produce the four element, four group Unar lens. In 1902 he realized that to reverse the two rear elements of the Unar and go back to a cemented doublet would improve the performance of Zeiss Unar lens. He named the result "Tessar", from the Greek word ￏﾄￎﾭￏﾃￏﾃￎﾵￏﾁￎﾱ to indicate a four element design.A Tessar comprises four elements in three groups, one positive crown glass element on the front, one negative flint glass element at the centre and a negative plano-concave flint glass element cemented with a positive convex crown glass element at the rear.
Early Tessar designs...
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