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| Tessar | |
|---|---|
| Name | Tessar |
| Caption | Tessar-type lens diagram |
| Designer | Paul Rudolph |
| Introduced | 1902 |
| Type | Photographic lens |
| Aperture | variable |
| Focal length | variable |
| Mount | various |
Tessar The Tessar is a photographic lens design introduced in the early 20th century that became widely influential in still photography, cinematography, and optics manufacturing. Combining a simple, compact optical formula with good sharpness and moderate contrast, it was adopted by major firms across Europe and Asia and featured in a range of cameras from folding field cameras to rangefinders and SLRs. The design bridged late 19th‑century Petzval and early 20th‑century anastigmat concepts and played a crucial role in the catalogs of companies such as Zeiss, Voigtländer, and Kodak.
The Tessar was created by Paul Rudolph while working at Carl Zeiss AG in Jena as part of a lineage including the Petzval lens and the Protar. Introduced in 1902, the Tessar succeeded earlier Rudolph designs such as the Cooke triplet‑inspired efforts and was contemporaneous with advances by designers like Ernest Abbe and August Köhler. The lens quickly entered production and commercial distribution through Carl Zeiss and later through licensed agreements with firms including Voigtländer, Leitz, Yashica, and Kodak. Over decades the Tessar saw iterative refinements amid the rise of competitors such as the Zeiss Sonnar and the Nikkor lines, surviving transitions from plate cameras to roll film, from medium format to 35 mm, and from film to digital imaging.
The Tessar optical formula uses four elements in three groups, typically arranged as a positive singlet front group, a negative middle element, and a cemented positive doublet at the rear. This layout evolved from earlier anastigmatic ideas championed by Ernst Abbe and refined through the work of Rudolph, offering correction for spherical aberration and astigmatism while maintaining compactness relative to contemporary multi‑element objectives such as the Cooke Anastigmat. The design balances longitudinal chromatic aberration and lateral color via glass selection—choices influenced by glassmakers like Schott AG—and by early 20th‑century improvements in anti‑reflective coatings such as those pioneered by O. Hanaman and industrial labs at Carl Zeiss Stiftung. The Tessar is noted for its relatively small number of air‑glass surfaces, which reduced flare and maintained contrast before widespread coating adoption.
Multiple manufacturers produced Tessar‑type lenses under license or as Tessar‑inspired derivatives. Carl Zeiss AG marketed the original design, while Voigtländer produced variants for folding cameras and rangefinders. Leica Camera and Schneider Kreuznach offered Tessar‑type optics or competitive counterparts in certain models, and Japanese firms such as Nippon Kogaku (now Nikon Corporation), Yashica, and Canon Inc. developed Tessar‑inspired designs for consumer cameras. American companies like Eastman Kodak Company and Argus likewise incorporated Tessar formulas in box and folding cameras. License arrangements and patent expirations led to regional names and badge engineering, with products branded under makers including Rollei, Minolta, Olympus Corporation, and Petri Camera.
Tessar variants typically exhibit a moderate maximum aperture (commonly f/2.8 to f/6.3 depending on application), compact back focal length, and good center sharpness with gradually softer corners when used wide open. The four‑element, three‑group structure produces controlled spherical aberration, satisfactory coma performance for portrait and landscape work, and a characteristic microcontrast often described in period tests by journals such as Photographische Korrespondenz and later by technical reviewers in Popular Photography. Tessar lenses perform well stopped down to mid apertures, with diffraction and field curvature defining practical limits. Manufacturing variables—glass quality from Schott AG, polishing tolerances at Carl Zeiss AG workshops, and coating procedures at firms like Oberhausener Werke—affect stray light, bokeh quality, and resolution. Many Tessar iterations include adaptations: asymmetric cemented rear groups, floating elements for close focus (employed by Rodenstock and Schneider Kreuznach), and scaled focal lengths for formats from large plate cameras to 35 mm.
The Tessar was ubiquitous in folding plate cameras of makers such as Voigtländer and Kodak and became a staple for compact 35 mm rangefinders by Leica Camera and Zeiss Ikon. Its balance of image quality and manufacturability made it suitable for portraiture, documentary photography, and amateur consumer markets; professional use persisted in medium‑format applications by studios using cameras from Rollei and Hasselblad. Cinematographers adapted Tessar‑type optics for projection and early motion‑picture cameras produced by companies like ARRI and Bell & Howell. In optical instruments, Tessar principles influenced microscope and projection objective development at institutions including Carl Zeiss Jena and research facilities at University of Jena.
The Tessar's enduring influence is evident in optical pedagogy, lens catalogs, and the aesthetic signatures of 20th‑century photography. It informed designs such as the Sonnar and later compact multi‑element lenses from Nikon Corporation and Canon Inc., and its economic success helped shape industrial practices at Carl Zeiss AG and licensees worldwide. Collectors and historians trace photographic trends through surviving Tessar‑equipped cameras in museums like the Deutsches Museum and archives at George Eastman Museum. Contemporary digital lens designs still echo Tessar trade‑offs—element count, group layout, and aperture choices—while modern coatings and computer‑aided design tools extend the original formula's concepts. Category:Photographic lenses