The EF 24-70mm f/2.8L II USM zoom lens continues the tradition of ensuring Canon's highest quality optical performance in its L-series lenses. This new version of one of Canon's most popular lenses utilizes one Super UD lens element and two UD lens elements to help achieve outstanding image quality throughout the full zoom range. The result is significantly reduced chromatic aberration in the outer area at wide-angle, high resolution and contrast in images and crisp clear edges around the subject. The lens coatings have been optimized to ensure exceptional color balance while minimizing ghosting, and reduced spherical aberration. The lens delivers soft backgrounds and incredible bokeh by using a circular nine-blade diaphragm.In demand by architectural, corporate, adventure and professional photographers of nearly every discipline, the EF 24-70mm f/2.8L II USM lens combines amazing image quality with enhanced durability. The new lens has enhanced durability and weather sealing to make it highly resistant to dust and water. The lens also features a zoom lock lever to secure the zoom position for safe transport, and fluorine coatings on the front and rear glass surfaces to reduce smears and fingerprints, making it an ideal lens regardless of the conditions.