Fix the Canon EF 17-40 mm f/4L USM Ultra-Wide Zoom Lens to your camera and capture high-quality close-up shots. This lens combines functionality and compactness with an f/4 maximum aperture to deliver high-performance, even at wide settings. A ring-type USM provides fast and silent AF(autofocusing). Ideal for both - film and digital SLR cameras, this zoom lens features three aspherical elements and a Super UD (Ultra-low Dispersion) glass element for enhanced optics. In addition, the lens boasts a weather-resistant design, a rear gel filter holder and a high-speed Ultrasonic motor.