Aristostigmatic
The Aristostigmat is a further development of the Gaussian double lens by Hugo Meyer from Görlitz .
After the American Alvan Graham Clark had patented the four-lens Gaussian double lens for the USA in 1888 , Meyer developed a greatly improved, very successful version. Meyer was not only able to correct the spherical and chromatic aberration with modern types of glass , but also the astigmatism ( German Reich patent (DRP) 125560 of June 10, 1900), which Clark had not yet managed with the Gauss lens. That of Paul Rudolph recently for Zeiss developed Planar had needed six lenses for the correction of astigmatism (at low field curvature).
The aristostigmat consists of two pairs of lenses that are largely symmetrical around the diaphragm and not cemented . In order to reduce annoying reflections prior to the invention of anti-reflective coatings, the designers used highly curved meniscus lenses.
In the Meyer catalog from 1936, Aristostigmats of the maximum apertures 1: 4.5 (bright, image angle 75 degrees) and 1: 6.3 (image angle 90 degrees) - the latter as a universal lens for "groups, portraits, interiors and other occasions" - offered. In addition, there is a wide-angle aristostigmatic 1: 9 with 100 degrees - according to its own representation - the best wide-angle lens at the time.
Hugo Meyer & Co., Görlitz
Aristostigmat 1: 4.6 / 21 cm
with central locking
Web links
Individual evidence
- ^ Kingslake, Rudolf (1889): The History of the Photographic Lens. Academic Publishers Inc. pp. 117f.
- ↑ http://depatisnet.dpma.de/DepatisNet/depatisnet?action=pdf&docid=DE000000125560A
- ↑ http://www.cameraeccentric.com/html/info/meyer_3.html