Canon EF 70-300mm f4-5.6 L IS USM Lenses Two mode optical Image Stabilization System increases usability by approximately four stops The EF 70-300 f/4-5.6L IS USM incorporates a floating focusing mechanism for sharpness from 3.9' (1.2m) to infinity. Two Ultra Low Dispersion (UD) elements for improved image quality and reduced chromatic aberration The Fluorine coating keeps soiling, smears and fingerprints to a minimum The lens accepts an optional removable tripod collar, and is dust and water resistant.