EF 100-400mm f/4.5-5.6L IS II USM. • Compact, high performance L-series super-telephoto zoom makes it ideal for sports and wildlife photography. • One fluorite and one super UD lens element provides excellent correction of chromatic aberration throughout the entire zoom range, helping to deliver high-quality images with high resolution and contrast. • Rotation-type zoom ring allows for more precise composition and excellent balance when handholding. • Inner focusing, ring USM, a high-speed CPU and optimized AF algorithms for fast and accurate autofocusing. • Optical Image Stabilizer provides up to four shutter speed steps of correction*. • Three image stabilization modes (standard, panning, and during exposure only) provide outstanding results for a wide range of shooting situations. • Improved zoom torque adjustment ring allows easy setting of zoom tension. • Highly resistant to dust and water, and amazing durability enabling shooting even in harsh conditions. • Circular aperture (9 blades) helps deliver beautiful, soft backgrounds. • Fluorine coating on front and rear lens surfaces helps reduce smears and fingerprints. • Lens hood with side window permits specialty filters to be adjusted with hood in place. • Newly designed tripod mount can be attached or detached without removing the lens from the camera. • Minimum focusing distance of 3.2 ft. / 0.98 m with 0.31x maximum magnification.