This is sounding pretty good...
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.
The new lens uses a lot of high-end components in its 17-element design: three LD (low-dispersion) elements, three aspherical elements, one hybrid aspherical element, and two XR (extra refractive index) elements. That boils down to a better job handling chromatic aberration and other lens problems.
The lens also has rounded aperture blades for better out-of-focus areas. "This rounded diaphragm retains a nearly circular shape even when taken two stops down from its fully open state," Tamron said.
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.
The new lens uses a lot of high-end components in its 17-element design: three LD (low-dispersion) elements, three aspherical elements, one hybrid aspherical element, and two XR (extra refractive index) elements. That boils down to a better job handling chromatic aberration and other lens problems.
The lens also has rounded aperture blades for better out-of-focus areas. "This rounded diaphragm retains a nearly circular shape even when taken two stops down from its fully open state," Tamron said.
via CNet
