Sigma 15-30mm f/3.5-4.5 EX DG
Check availablity: eBay.
Some barrel distortion at the wide end. The built-in fixed lens hood only does only a so-so job in preventing flare and ghosting. Contrast is less than excellent and colour rendering is on the warm side. The huge, bulging front element prevent you from mounting filters on the lens.
When used on an FX-body, edge sharpness declines somewhat at extreme ends of the focal range. However, if you want super wide zoom on FX, and are not prepared to pay the asking price for the suberb Nikkor 14-24mm f/2.8, this is a good alternative at a fraction of the price.
Rating: Ed: 80, User: - (normalized, 0=useless, 50=average, 100=excellent).
Mounts: Canon EF, Nikon F, Sigma SD.
Optical zoom: 2x.
Close focus distance (CFD): 30 cm / 0.98 ft (from sensor plane).
CFD magnification: 1:6 / 0.17X.
Focus: AF (Nikon version requires in-body focus motor).
IR: No hotspot reports.
Approximate street price: USD 500 (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.