This lens can truly be described as a professional workhorse, with robust build (including dust and moisture resistance), wide F2.8 maximum aperture, fast & silent ultrasonic autofocus motor, & optical image stabilization for hand-holding at slow shutter speeds. The L-series is Canon’s flagship professional lens range with outstanding image performance. The 3rd iteration of Canon’s 70-200mm lens benefits from the new lens element coatings (Super Sprectra Coating) and Air Sphere Coating to reduce flare in backlight situations and updates to its durability make it perfect for the photographer on the go.