Sigma 24mm f/1.8 EX DG DF Macro
The main attraction of the lens is its low cost (compared to the similar alternatives from the camera manufacturers) and its f/1.8 maximum aperture. It delivers good results in the centre even wide open. Vignetting is negligible. Flare and hosting is about average. Lateral CA is pronounced, but can be corrected in post-processing. On a DX camera, sharpness is very good at medium to long distances, especially when stopped down a few clicks. Focusing below 50 cm, performance is degraded due to front-focusing and more pronounced CA. On an FX camera, the problems with corner sharpness is much more visible.
Mechnically, it is a typical Sigma EX-lens with a good solid feel to it. The f/1.8 maximum aperture makes the lens quite bulky, with a 77 mm filter diameter. Internal focus system eliminates front lens rotation. Unlike most of Sigma's EX-lenses, it does not come with a ring type focus-notor, so auto-focus is unfortunately slow and noisy. It comes with a bayonet-style lens hood, front and rear covers, and a solid lens case.
Conclusion: If you are looking for a moderate wide-angle lens with a fixed focal length for the DX format, this lens is an attractively priced option, suitable for low-light situations, provided you don't need critical corner sharpness. On FX, the the poor corner sharpness makes it a less attractive choice.
Rating: Ed: 55, User: - (normalized, 0=useless, 50=average, 100=excellent).
Mounts: Canon EF, Four-Thirds, Nikon F, Pentax K, Sigma SD, Sony A.
Aperture range: f/1.8 to f/22.
Close focus distance (CFD): 18 cm / 0.59 ft (from sensor plane).
CFD magnification: 1:2.7 / 0.37X.
Focus: AF (Nikon version requires in-body focus motor).
Filter diameter: 77 mm.
L x D, W: 79 x 84 mm, 486 g.
Approximate street price: USD 449 (new, w/o tax).
Introduced: no data.
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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.