A large aperture L-Series standard zoom lens that combines high image quality and enhanced durability. A constant f/2.8 maximum aperture for effective imaging in low light and shallow depth of field and  a new optical design utilizes one Super UD lens element and two UD lens elements to minimize chromatic aberration in the outer area at wide-angle, as well as eliminate color blurring around the edges of the subject, for images with high resolution and contrast.

The lens combines two types of aspherical elements to reduce spherical aberration, and achieve high image quality across the entire screen area and throughout the full zoom range. It is highly resistant to dust and water, enabling shooting even in harsh and rigorous conditions.

A nine-blade circular diaphragm delivers beautiful, soft backgrounds. And a ring USM, a high-speed CPU, and optimized AF algorithms allow for fast autofocusing, while manual focus override in One Shot AF mode allows precise manual focus even in AF mode. Optimized lens coatings ensure exceptional color balance while minimizing ghosting, and a fluorine coating on the front and rear lens surfaces reduces smears and fingerprints.

A zoom lock lever locks the zoom position at the wide end for safe transporting.