The Sigma 18-35mm f/1.8 DC HSM Art is the world's first F1.8 constant aperture zoom lens
The Sigma 18-35mm f/1.8 DC HSM Art lens is constructed from 17 elements in 12 groups
Third-party lenses are sometimes looked down upon by the sort of photographers who insist you can only take a good photo if your lens says Canon or Nikon on it. But, not only do some outperform their branded counterparts, others do something which mean they don't even have first-party rivals. The new Sigma 18-35mm F1.8 DC HSM Art, for example, is the world's only zoom lens to achieve a maximum aperture F1.8 throughout the entire range.
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