Sigma 105mm f/2.8 EX DG AF Macro
Rating: Ed: -, User: - (normalized, 0=useless, 50=average, 100=excellent).
Mounts: Canon EF, Four-Thirds, Nikon F, Pentax K, Sigma SD, Sony A.
Aperture range: f/2.8 to f/32.
Close focus distance (CFD): 31 cm / 1.02 ft (from sensor plane).
CFD magnification: 1:1 / 1X.
Focus: AF (Nikon version requires in-body focus motor).
Filter diameter: 58 mm.
L x D, W: 95 x 74 mm, 450 g.
IR: No hotspot reports.
Approximate street price: USD 479 (new, w/o tax).
Production: 2004-2011, replaced by: Sigma 105mm f/2.8 EX DG OS HSM Macro.
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.