Overview A superb successor model of the professional zoom lens that is ideal for digital photography. It features various special lens elements including 3 aspherical lens elements, 1 Super UD lens element and 2 UD lens elements for excellent image quality in the entire zoom range. The lightweight design, together with the new zoom ring lock and fluorine coating, making this lens more durable and reliable. Highlights - Professional f/2.8L large aperture standard zoom lens - Newly developed 18 elements in 13 group optical design - 1 Ultra-high-precision Ground-glass and 2 high-precision Glass-molded (GMo) Aspherical lens elements - 1 Super UD and 2 UD lens elements - 9-blade circular aperture - 0.38m minimum focusing distance - Inner focusing design, ring USM and optimized AF algorithm achieve fast, quiet and accurate autofocus - Optimized lens coatings for digital cameras to ensure excellent color balance and minimize ghosting and flare - Fluorine coating to make cleaning easier - Enhanced lens structure to increase durability and toughness to cope with the demand of professional users - New zoom ring lock to lock the zoom position at wide end - A 15% reduction compared to previous generation - Dust and water resistant