The Canon EF 70-300mm F4-5.6L IS USM is an amazing telephoto zoom lens that combines high image quality with an extremely durable construction and a surprisingly compact design. It sets a new standard for this popular zoom range with its professional autofocus performance and the latest generation of Image Stabilization, but is still affordable for the enthusiast. Throughout the zoom range the lens shows optical qualities that are in line with fixed focal length lenses - it performs very well even at its widest aperture, and the environmental shield protects it from moisture and dust.