Tamron 24-70mm f/2.8 Di SP VC USD Lens for Canon (Used)

Realizing both high performance and high image quality, this high-speed standard zoom lens offers 24mm to 70mm coverage together with Tamron's exclusive VC (Vibration Compensation) system and a USD (Ultrasonic Silent Drive) motor for fast and quiet autofocus. Since this is an SP (Super Performance) series lens, the optical design places the highest priority on image quality with the extensive use of special optics, including three LD (Low Dispersion) lenses and two XR (Extra Refractive Index) lenses. The result is best-in-class image quality that reduces various type of distortion. In addition, the F/2.8 high speed and the circular diaphragm construction enable this lens to achieve beautiful out-of-focus effects while the high resolution gives finely detailed images. In a Tamron first, a simple drip-proof structure is also featured. This full-spec standard zoom lens responds fully to the inspiration of the photographer.

Key Features

• World's first full-size, high-speed standard zoom with built-in VC (Vibration Compensation). Even when shooting in low-light conditions with a slow shutter speed to render sharpness, Tamron's acclaimed VC allows for stable handheld camera work, to more fully enjoy the benefits of this high-speed zoom lens.
• Uses specialized high-grade glass in the three LD elements, three Glass Molded Aspherical Lenses, one Hybrid Aspherical Lens and two XR (Extra Refractive Index) glasses, delivering top-of-the-class quality images suited to this high-grade lens. Using a rounded diaphragm, the lens achieves gorgeous blur effects.
• Features USD (Ultrasonic Silent Drive) to power a speedy AF drive together with a continuous manual mechanism.
• This high-speed standard zoom lens has a wide-end focal length of 24mm that expands the photographic area.
• The lens adopts the new technology including the latest optical design, VC (Vibration Compensation) image stabilization and USD (Ultrasonic Silent Drive), all in a lighter and more compact package.
• Moisture-resistant construction helps prevent water from penetrating the lens.

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 has been 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 positioned 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.