Constant, bright f/2.8 aperture Four stop image stabiliser L-series professional construction and optics Water and dust resistant 1.2 metre minimum focusing For a professional photographer the Canon 70-200mm f/2.8 IS II USM lens represents a high quality medium-range telephoto zoom lens capable of reacting rapidly to a moving subject and compensating for camera shake. With a robust construction the Canon 70-200mm f/2.8L IS II USM Lens is the perfect companion for the adventurous photographer. The constant f/2.8 aperture makes the Canon 70-200mm f/2.8L IS II USM lens capable of producing bright images and focusing rapidly. Even at higher shutter speeds exposure is not adversely affected, and lower ISO ranges can be utilised in lower light situations and the Ultrasonic AF Motor keeps autofocus both rapid and quiet. The image stabiliser means shutter speeds four stops slower can be used and sharpness retained. Thanks to the L-series construction the Canon 70-200mm f/2.8L IS II USM lens is incredibly robust as well as water and dust proof.