20:20 vision: Hands-on with Sigma's 20mm F1.4 'Art'

Sigma has grown its 'Art' lineup of prime lenses again, with a new 20mm F1.4 for Canon, Nikon and Sigma mounts. The new 20mm F1.4 DG HSM | Art  is designed for full frame DSLRs, and Sigma claims that the 20mm F1.4 is the result of new production technologies including a 59mm double aspherical element. The new 20mm will go on sale from November priced at £849.99/$899.99, and we just got our hands on a sample at the Photo Plus Expo in New York. Click through for some first impressions