Hot on the heels of its Photokina announcement, the Sigma 12-24mm F4 Art arrived on our doorstep last week, meaning it was time to shoot wide. Just 1mm shy of matching the world's widest rectilinear zoom, the Canon 11-24mm F4 L, the Sigma gives a large amount of the Canon's focal range for a much lower price of $1599. To see if its images are as tempting as the specs are, we wasted no time getting it out in the real world mounted on the new Canon 5D Mark IV, the 5DSR, and a Sony a7R II with Sigma's MC11 adaptor.  

See our Sigma 12-24 F4 Art real world samples