Tamron 150-600mm f/5-6.3 Super Performance (SP) Digitally Integrated (DI) Vibration Compensation (VC) Auto-Focus Ultrasonic Silent Drive (USD) Super Telephoto Zoom Lens for Canon Digital SLR Cameras TAMRON LENS: An innovative ultra-telephoto zoom lens with a focal length range of 150mm to 600mm for full-frame and APS-C format DSLR cameras. COMFORTABLE AUTO-FOCUS: Tamron's SP 150-600mm F/5-6.3 Di VC USD features a USD (Ultrasonic Silent Drive) ultrasonic motor drive for swift and accurate AF response, it delivers high torque, very fast response times, and very low noise. The full-time manual focus mechanism allows users to make fine manual focus adjustments at any time even when AF is engaged. CAPTIVATING FEATURES: Its 4x ultra-telephoto zoom capabilities, with a focal length range from 150mm to 600mm, enhance the creative potential of telephoto photography, a captivating feature forall photographers, particularly nature, wildlife, and sports shooters. BEAUTIFUL BACKGROUND BLUR EFFECTS: Adopting a 9 blade circular diaphragm enables users to create beautiful background blur effects (Bokeh), which provide even greater potential for creative expression. This circular diaphragm retains a nearly circular shape even at two stops down from its maximum aperture. WORLD CLASS IMAGE QUALITY: Employing 20 elements in 13 groups and boasting an advanced optical design, the lens delivers a superior balance of resolution and contrast for sharp, clear images. The front group contains three LD (Low Dispersion) glass elements (two in the first group, one in the third) for enhanced optical correction effectiveness, enabling the lens to thoroughly compensate for on-axis aberrations at the telephoto end.