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Construction:12 Groups/ 17 ElementsAngle of view:84°04' -34°21' (for full frame 35mm format cameras) 60°20' -22°33' (for APS-C format cameras)Maximum Aperture:F/2.8Minimum Aperture:F/22Closest Focusing Distance:0.38m (15.0 in)Maximum Magnification:1:5 (at f=70mm: MFD 0.38m)No. of Diaphragm Blades:9 (rounded diaphragm)Filter Size:82mmDimensions (Length x Diameter):4.3'' x 3.5'' (108.5 x 88.2mm)Weight:29.1 ox / 825g・World's first full-size high-speed standard zoom with built-in image stabilization (VC - Vibration Compensation)・Fast F/2.8 aperture throughout the zoom range・Top-in-class quality images with 3 LD 3 Glass Molded Aspheric 1 Hybrid Aspheric and 2 XR (Extra Refractive Index) elements・New VC anti-shake mechanism with 4-stop advantage・USD (Ultrasonic Silent Drive) powers a speedy AF drive together with continuous manual focus control (Full-Time Manual/FTM)・Moisture-resistant construction helps prevent water from penetrating the lens・A rounded diaphragm retains a nearly circular shape even at two stops down from its fully open F/2.8 aperture for beautiful bokeh・Internal AF motorTamron SP 24-70mm F/2.8 Di VC USD (Model A007) the world's first full-size high-speed standard zoom lens equipped with VC (Vibration Compensation) image stabilization and USD (Ultrasonic Silent Drive) with resolution at the top ofits class. VC (Vibration Compensation) VC (Vibration Compensation) is Tamron's proprietary image stabilization system. Tamron's VC is a three-coil system whereby three driving coils activate the shake-compensating VC lens group electromagnetically via three steel balls. The VC lens elements are held in place only by contact with the steel balls achieving smooth movement with little friction. This provides a stable viewfinder image with excellent tracking performance. And as the VC lens may be moved in parallel using only the motorized control the mechanical structure hasbeen simplified enabling the creation of a more compact lens. New VC system (moving coil method) Tamron's original VC image stabilization mechanism utilized a moving magnet system whereby a heavy magnet was positio ned near the moving VC lens element. In the new VC unit the positions of the magnet and the coil are reversed because of this the VC optical lens element is attached to the coil. The new VC mechanism employs a moving coil mechanism with a lightweight coil and the lighter coil reduces the load on the drive system. Thus the lighter more compact new VC unit contributes to the lens's overall light weight and compact size. Because the 24-70 mm F/2.8 Di VC USD is a high-speed zoom lens with maximum aperture of F/2.8 its VC system must drive a lens that is larger and heavier than other zooms. Therefore the shape size and layout of the drive coils are all designed to obtain sufficient thrust. The result is a full-size high-speed zoom that provides the same high level of compensation effect. About the ultrasonic motor In the ultrasonic motor a piezoelectric element arranged in a ring formation generates ultrasonic vibrations in a metallic ring stator and the vibration energy is used to rotate a metallic ring rotor that is attached to the stator. The rotation energy is in turn transferred from the metallic ring rotor to operate the focus lens.The Tamron 24-70mm is commonly used for Landscape/scenery Weddings and more.The Tamron 24-70mm is popular because customers like the following qualities of the Tamron 24-70mm: Fast / accurate auto-focus Nice bokeh and Strong construction.

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