In number theory, σ is included in various divisor functions, especially the sigma function or sum-of-divisors function. In applied mathematics, σ (T) denotes the spectrum of a linear map T.

Format Mirrorless 62 DSLR 26 Mount L-Mount 62 Sony E 64 Canon RF 9 Nikon Z 3 Canon EF 26 Nikon F 25 Canon EF-M 3 Sigma SA 24 Sony A 3 Fujifilm X 10 Micro 4/3 3 Pentax 2 Sensor Coverage Full …

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Sigma Corporation of America is a subsidiary of the Sigma Corporation, a Japanese based family owned manufacturer of DSLR cameras, camera lenses and camera accessories.

Sigma is the eighteenth letter of the Greek alphabet. In the system of Greek numerals, it has a value of 200. When used at the end of a word (when the word is not all caps), the final form (ς) is used, e.g. …

Sigma Corporation (株式会社シグマ, Kabushiki-gaisha Shiguma) is a Japanese company, manufacturing cameras, lenses, flashes and other photographic accessories.

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