DPReview: Wide angle: Sigma's new Art lens is fastest 20mm in the world

Lens manufacturer Sigma has introduced a new lens to its Art range of premium optics that it claims is the fastest 20mm in the world. The new 20mm F1.4 DG HSM | Art  is designed for full frame cameras and will be available in mounts for Canon EF, Nikon F and Sigma models. Read more

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