Sigma 105mm f/2.8 EX DG OS HSM Macro
This lens is complete redesign of Sigmas earlier 105 mm macro lens. It has a much more complex optical formula with a floating focusing system that moves two different lens groups in the optical path to different positions to compensate for astigmatic aberration and spherical aberration. The new version also has a HSM motor with full time manual override and Sigma's optical stabilsation system.
Supplied with lens hood LH680-03 (bayonet).
Rating: Ed: -, User: - (normalized, 0=useless, 50=average, 100=excellent).
Mounts: Canon EF, Nikon F, Pentax K, Sigma SD, Sony A.
Aperture range: f/2.8 to f/22.
Close focus distance (CFD): 31 cm / 1.02 ft (from sensor plane).
CFD magnification: 1:1 / 1X.
Focus: AF (built-in, ring-type).
Filter diameter: 62 mm.
L x D, W: 127 x 79 mm, TBD g.
IR: No hotspot reports.
Approximate street price: USD 969 (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.