Photographers looking for an ultra-wide angled lens for their Canon cameras get the widest option with this Canon 24mm lens. This is the widest angled lens that Canon makes, an aperture wider than the f/2.8, and two stops wider than all other Canon wide-angle lenses. It is also the brightest lens in its class, and is perfect for low-light photography. This lens is ideal for wildlife and landscape photography, as the lens itself is weatherproof and dustproof, thanks to Canon's subwavelength structure coating. While a filter for full-sealing is needed for maximum protection, this coating also protects against light pollution, making photos sharper. The UD glass lens helps reduce any aberrations and there is a high-speed CPU that makes the autofocus itself faster and quieter when working. The circular aperture delivers out-of-focus background highlights, making this a great option for professional photographers and hobbyists alike.