Sigma 12-24mm f/4.5-5.6 EX HSM DG
Widest there is for FX. However, less sharp than its DX brother (Sigma 10-20 mm). Huge, bulging front element (this lens is known as “Popeye” to its friends). No filter threads. Even more sample variations than usual with Sigma.
The Pentax and Sony version do not have a built in focus motor.
Rating: Ed: -, 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).
Filter: gel insert (rear).
IR: No hotspot reports.
Approximate street price: USD 860 (new, w/o tax).
Production: 2002-2011, replaced by: Sigma 12-24mm f/4.5-5.6 EX DG 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.