The Canon EF 70-200mm f/2.8L IS III USM Lens provides high image quality with one fluorite element and five UD elements. It is highly resistant to dust and water, and has an improved durability even in harsh conditions. A fluorine coating on the front and rear elements helps reduce smears and fingerprints. Focusing Distance The lens has a minimum focusing distance of 3.9-feet/1.2m. It has full-time manual focus, and an inner focusing system with ring ultra-sonic motor. Optical Image Stabilization The lens has Optical Image Stabilization at up to 3.5 stops of shake correction. Air Sphere Coating The Canon EF 70-200mm f/4L IS II USM Lens has an air sphere coating (ASC) that minimizes ghosting and flare.