As a mid-range telephoto lens for professional photographers, lenses from Canon are of top quality. The Canon -EF 70-300mm f/4-5.6 IS USM Lens is a professional lens from Canon that does the work of zooming in on objects that are far away, smoothly and efficiently. With a fast and quiet autofocus that is a result of the ultrasonic motor, this lens is made of 15 elements in 10 groups, using lead free glass, which is environment-friendly and produces better photographs. The lens also features a zoom ring lock that prevents it from extending while stored or being carried in a camera bag, thus minimising risks of the lens getting damaged. It is smaller in diameter and has a lighter build, thus adding to its portability.