The Tamron SP 70-200mm f/2.8 Di VC USD G2 Lens – Canon is a telephoto zoom lens with an aperture range of f/22 to f/2.8 and a circular diaphragm consisting of nine blades. This lens features 23 elements in 17 groups, including five low dispersion lens elements and an extra-low dispersion element for its optical construction. It is also equipped with Ultrasonic Silent Drive and Vibration Compensation technology with three modes.