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This Canon EF 100-400mm f/4.5-5.6L IS USM Autofocus Lens offers high resolution, superb contrast, neutral color balance, and Canon& acute;s original built-in Image Stabilizer function. High zoom magnification is achieved by means of a 6-group configuration with 5 movable groups. Fluorite and Super UD glass completely eliminate secondary spectrum for superb color rendition. Autofocusing is fast and silent with Canon& acute;s ring USM, and AF speed is further enhanced through an advanced, lightweight rear focusing design that incorporates a floating element for consistent image quality at all focusing distances from 5.9& acute; to infinity. This lens is also equipped with a dual-mode Image Stabilizer suitable for panning as well as stationary subjects. With full-time manual focus, one-touch zooming with a wide grip, and a special ring that permits adjustment of zooming friction, this is a lens that& acute;s extremely easy to use, and ideal for a wide variety of applications including nature, wildlife, sports, and documentary photography.