Sigma Corporation

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Sigma Corporation (株式会社シグマ, Kabushiki-gaisha Shiguma^?) is a Japanese company founded in 1961, 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 lenses and other accessories that are compatible with the cameras produced by other companies.

Sigma produces products to work with cameras from Canon, Nikon, Pentax, Konica Minolta, Sony and Olympus, as well as for their own cameras.

Sigma lenses are usually less expensive than the equivalent offering from the manufacturer of the camera body in question, so are therefore often sold bundled with a camera body as a less expensive alternative to the manufacturer's body and lens kit.

Sigma's digital SLRs, the SD9, SD10 and forthcoming SD14, are unusual in their use of the Foveon X3 image sensor. All use the SA lens mount.