The Canon EF 16-35mm f/4L IS USM lens blends wide-angle and low-light performance effortlessly, and is a must have accessory for any DSLR camera setup. Featuring a construction of 3 aspherical lens elements with 2 UD elements, this lens enables you to shoot photos with minimal distortion throughout the zoom range. Thanks to the circular 9-blade diaphragm, you get rich and even background blur. The AF system of this lens is supremely precise and noiseless. When using this lens with the Canon PROTECT filter, it resists dust and water. This enables you to use this lens even in adverse climatic conditions.