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 incredibly 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.