The Tamron SP 70-200mm f/2.8 Di VC USD Zoom Lens for Canon is a high-speed standard to telephoto zoom lens with a fast f/2.8 maximum aperture throughout the zoom range. Designed for full-size SLR and DSLR cameras, it offers superior image quality accentuated by advanced Vibration Compensation (image stabilization) and an Ultrasonic Silent Drive Motor for quiet, smooth and precise autofocus. A new optical design for this popular focal length zoom delivers high contrast and high resolution throughout the zoom range and one Extra-low Dispersion element with four Low Dispersion elements minimize chromatic aberrations. A circular diaphragm that retains its round shape even when taken down two stops from f/2.8 offers expressive background blurring. A compact build with large focus and zoom rings and a moisture resistant construction, this lens comes with a removable tripod collar and a petal-type lens hood.