Sigma Art Series - 12 -24mm f 4 for Canon field test
The build quality is solid, stylish and heavier than its rivals.The quality of images from Sigma of its art series is excellent. This zoom lens with constant aperture at f4 works really well with both Canon full frame and APS-C cameras. The image quality is excellent in the center of the frame for full frame cameras and is much better on APS-C cameras. The range of 12 -24mm is really good for both photographers and DSLR videographers. The auto focus is not quick as the Canon but its silent and works well. Comparing the price with the rivals, its cheaper and a good alternate option.