Sigma 10-20mm f/3.5 EX HSM DC
Released in July 2009. Solid build, ring HSM. Good overall sharpness and well-controlled flare and ghosting. Some vignetting at all focal lengths. Barrel distortion and coma at the wide end. Some CA, in particular in the middle of the zoom range.
Rating: Ed: 78, User: - (normalized, 0=useless, 50=average, 100=excellent).
Mounts: Canon EF, Nikon F, Pentax K, Sigma SD, Sony A.
Optical zoom: 2x.
Focus: AF (built-in, ring-type).
Approximate street price: USD 650 (new, w/o tax).
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.