A flexible lens for telephoto shooting, the Canon EF-mount 100-400mm f/4.5-6.3 Di VC USD from Tamron spans a useful focal length range along with a lightweight design for even greater versatility. The lens's optical design incorporates three low dispersion elements to suppress color fringing and chromatic aberrations, while an eBAND coating has been applied to individual elements to reduce lens flare and ghosting for greater contrast and clarity. Complementing the optical design is a high-speed Ultrasonic Silent Drive autofocus system, which is benefitted by a dual MPU for quick and responsive performance. Vibration Compensation is also featured to minimize the appearance of camera shake for sharper handheld shooting. Suiting this 100-400's use outdoors, it's magnesium alloy construction is also weather-sealed for working in harsh environmental conditions.