Tessar
Photographic lens design / From Wikipedia, the free encyclopedia
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The Tessar is a photographic lens design conceived by the German physicist Dr. Paul Rudolph in 1902 while he worked at the Zeiss optical company and patented by Zeiss in Germany; the lens type is usually known as the Zeiss Tessar. Since its introduction, millions of Tessar and Tessar-derived lenses have been manufactured by Zeiss and other manufacturers, and are still produced as excellent intermediate aperture lenses.
Introduced in | 1902 |
---|---|
Author | Paul Rudolph |
Construction | 4 elements in 3 groups |
Aperture | f/6.3 (1902) f/4.5 (1907) f/2.8 (1930, by Willy Merté) |
The Tessar design uses four spherical lens elements in three groups, one positive crown glass element at the front, one negative flint glass element at the center and a negative concave flint glass element cemented with a positive convex crown glass element at the rear.