The Protar f.7.5 anastigmatic lens were commercially successful in 1889. Manufactured by Carl Zeiss Works located in Jena, Germany and designed by German physicist Paul Rudolph. The anastigmatic lens provides a clear image edge-to-edge, compared to earlier lens types that provided a sharper focus for light entering through the centre of the lens.
Carl Zeiss Works
- Pioneer folder – Camera-wiki.org – The free camera …
Nov 8, 2017 – The lens is a Golder Anastigmat 7.5cm f/3.2, advertised as hard coated, … The camera was certainly not a commercial success, and it is rarely …
- History of photographic lens design – Wikipedia
Paul Rudolph’s Protar was the first successful anastigmat (highly corrected [for the era] for all aberrations, including properly for astigmatism) lens. It was scalable from f/4.5 portrait to f/18 super wide angle.
- Anastigmat – Wikipedia
An anastigmat or anastigmatic lens is a photographic lens completely corrected for spherical aberration, coma, and astigmatism. Early lenses often included the …
- The unique history of the Otus lens family | ZEISS
May 28, 2018 – Rudolph himself modified the Protar towards the famous Tessar lens in 1902. The Tessar, advertised as the “eagle-eye” of the camera, was an immediate commercial success due to its compact size and high performance at a high speed of about f/4, which was later improved to f/2.8.
- Kodak Ektars – bnphoto.org
Kodak Anastigmat lenses began appearing about 1915. … Some designs are inherently more successful than others. … were retired and the Eastman Ektars became the Commercial Ektar line of f /6.3 lenses in 8 1/2-inch, 10-inch, 12-inch and …