This Canon 10-22mm USM lens offers an ultra-wide-angle zoom lens that fits onto every EF-S mount EOS digital camera. The focal length of this camera lens is around 16-35mm, so the photographer can get very close to a subject to exaggerate the difference in sizes between near and more distant objects. It also works to create a pan focus, so everything is sharply in focus regardless of its distance from the camera. The USM autofocus is smooth, fast, and quiet, and professional photographers can use the one-shot AF to override it completely and manually focus shots for precise images. Three aspherical lens elements make up the lens along with Super-UD glass, which works to minimize aberrations and create sharp, high-quality photos. An optimized lens coating minimizes the flare and ghosting.