Sigma 30mm f/1.4 EX DC HSM
The Sigma AF 30mm f/1.4 EX DC HSM is a lens with a mission – to achieve the highest center resolution there is without caring too much about the rest.
Its f/1.4 maximum aperture is of limited use, as it is fairly soft wide open. If you stop down, colours and contrast are decent. There are some CA, but flare is well controlled. Some barrel distortion is noticeable if straight lines are near the edges. Vignetting is minimal, but some vignetting is visible in the corners wide open.
For users of the Sigma SD9 and SD10 bodies, this lens is not a happy choice, as auto-focus for some reason is very unreliable. This, however, is corrected in the SD14, SD15 and SD1.
Rating: Ed: -, User: - (normalized, 0=useless, 50=average, 100=excellent).
Mounts: Canon EF, Four-Thirds, Nikon F, Pentax K, Sigma SD.
Aperture range: f/1.4 to f/16.
Close focus distance (CFD): 40 cm / 1.31 ft (from sensor plane).
CFD magnification: 1:10 / 0.1X.
Focus: AF (built-in, ring-type).
Filter diameter: 62 mm.
L x D, W: 59 x 74 mm, 430 g.
Approximate street price: USD 439 (new, w/o tax).
Introduced: no data.
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.