The Sigma EX 10-20mm f/4.0-5.6 HSM DC EX Lens for Canon is a versatile wide-angle lens suitable for Canon cameras. With a maximum aperture of f/5.6, this lens allows for excellent low-light performance and beautiful bokeh. It offers both auto and manual focus options, along with zoom capabilities, giving photographers flexibility in their shooting styles. The lens is lightweight at 470g, making it easy to carry around for everyday photography. Overall, this Sigma lens is a great addition to any Canon photographer's kit, offering high-quality images and reliable performance.