Sigma 70-200mm f/2.8 EX DG HSM
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Mounts: Canon EF, Four-Thirds, Nikon F, Sigma SD, Sony A.
Aperture range: f/2.8 to f/22.
Optical zoom: 2.9x.
Close focus distance (CFD): 180 cm / 5.91 ft (from sensor plane).
Focus: AF (built-in, ring-type).
Filter diameter: 77 mm.
L x D, W: 184 x 86 mm, 1222 g.
IR: May produce a hotspot.
Discontinued: 2007, replaced by: Sigma 70-200mm f/2.8 EX DG APO Macro HSM II.
Sigma is a family owned manufacturer of photographic equipment founded in 1961 in Japan. The company's main business is to manufacture third party lenses. However they also produce third party flash units and, since 2002, their own line of DSLR and compact cameras. Sigma's digital cameras use a special sensor, developed by Foveon, that records full color information for every pixel. In late 2008 Sigma acquired Foveon.