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The first contact lenses were made of glass, in 1888. Initially the glass was blown but soon lenses were made by being ground to shape. For the first fifty years, glass was the only material used. The lenses were thin, yet reports of injury were rare. In 1938 perspex (polymethylmethacrylate, or PMMA) began to replace glass in contact lens ...
Leica R lenses. Leica 15 mm f/3.5 Super- Elmar -R – 1980 (Carl Zeiss design) Leica 15 mm f/2.8 Super- Elmarit -R ASPH – 2001. Leica 16 mm f/2.8 Fisheye-Elmarit-R – 1970 (Minolta design and glass production) Ernst Leitz Canada Elmarit R19/2.8. Leica 19 mm f/2.8 Elmarit-R 1st version.
Leica Summilux-M 50 mm f /1.4 Version 2 (1961 – 1968) Leica Summilux 35 mm f /1.4 Version 1 Optical Diagram of Leica Summilux-R 50mm f/1.4 II lens.. The name Summilux is used by Leica and Panasonic Lumix to designate camera lenses that have a maximum aperture brighter than f/2, typically at f/1.4, but dimmer than f/1.0.
The Carl Zeiss Planar 50mm f/0.7 is one of the largest relative aperture (fastest) lenses in the history of photography. [1] The lens was designed and made specifically for the NASA Apollo lunar program to capture the far side of the Moon in 1966. [2][3][better source needed][4] Stanley Kubrick used these lenses when shooting his film Barry ...
For example, if a lens's focal length were 100 mm and its entrance pupil's diameter were 50 mm, the f-number would be 2. This would be expressed as " f /2 " in a lens system. The aperture diameter would be equal to f/2. Most lenses have an adjustable diaphragm, which changes the size of the aperture stop and thus the entrance pupil size. This ...
75-260mm f / 4.5: Tokina T4 & TX mounts 75-300mm f / 4.5-5.6: Kobori 80-200mm f / 4: Tokina TX 80-200mm f / 4.5: Kiron, Komine, and Kobori Different models. Manufacturer distinguished by serial number. 85-205mm f / 3.8: Kiron Preset T-mount and automatic diaphragm fixed-mount versions 90-230mm f / 4.5: Tokina T4 and close-focus TX versions 90 ...