This classic Canon EF 100-400mm f/4.5-5.6L IS USM is a proven telephoto zoom workhorse designed for Canon full-frame and APS-C DSLRs. Featuring a 4x zoom range, built-in image stabilisation, and ultrasonic motor for fast and silent autofocus, this L-series lens delivers exceptional performance for sports, wildlife, and action photography. The optical design incorporates fluorite and Super UD glass elements to minimise chromatic aberration and ensure superb sharpness throughout the zoom range. With its distinctive push-pull zoom mechanism and rugged all-metal construction, this secondhand lens remains a favourite among enthusiast photographers seeking reliable long-distance coverage with a compact, portable package.