Sigma Corporation
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Sigma Corporation is a Japanese company, manufacturing cameras, lenses, flashes and other photographic accessories. All Sigma products are produced in the company's own Aizu factory in Bandai, Fukushima, Japan. Although Sigma produces several camera models, the company is best known for producing high-quality lenses and other accessories that are compatible with the cameras produced by other companies.
Kazuto Yamaki (CEO of Sigma) on 25 September 2018 at photokina in Cologne
Sony NEX-5 with Sigma 30mm F2.8 EX DN lens.
Sigma 200–500mm F2.8 EX DG displayed at the 2008 photokina
Sigma macro, telephoto and wide angle lenses (left to right)
Nikon F-mount
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The Nikon F-mount is a type of interchangeable lens mount developed by Nikon for its 35mm format single-lens reflex cameras. The F-mount was first introduced on the Nikon F camera in 1959, and features a three-lug bayonet mount with a 44 mm throat and a flange to focal plane distance of 46.5 mm. The company continues, with the 2020 D6 model, to use variations of the same lens mount specification for its film and digital SLR cameras.
The Nikon F of 1959 embodies the original F-mount.
The Nikon D7000 reveals a modern F-mount design, including aperture lever (left), CPU contacts (top), and mechanical AF linkage (lower left).
The flange of a current F-mount lens, including aperture lever (upper left) and CPU contacts (bottom).
Nikon F professional SLR camera with eyelevel prism and early NIKKOR-S Auto 1,4 f=5,8cm lens (1959)