The proprietary VC (Vibration Compensation) mechanism developed by Tamron features a triaxial configuration using three pairs of driving coils and slide balls around the compensator group of the lens’ optical system. Since the compensator lenses are supported with rolling friction of the balls, the response performance is enhanced and the construction is simple, which results in the compactness of the lens. The lens incorporates a highly accurate gyro sensor for detecting hand-shake, which, combined with a 32-bit RISC CPU, offers comfortable anti-vibration effects.

Outstanding Design Realizing High Zoom Power, VC Mechanism and Compactness

The AF28-300mm F/3.5-6.5 XR Di VC integrates optical technologies that Tamron has accumulated as the pioneer and leader of high power zoom lenses in order to realize the desired compactness even while incorporating the VC mechanism. The optical system uses a number of lens elements made from special optical glass materials including XR (high refraction index) glass elements, GM (glass-molded) elements, hybrid aspherical elements, LD (low dispersion) glass elements to compensate for on-axis and lateral chromatic aberrations and AD (anomalous dispersion) glass element. The lens offers high contrast, high resolution performance and flatness of the image field as a one-does-it-all zoom lens designed to match the characteristics of DSLR cameras.

Revolutionary MFD of 19.3” (0.49m) Throughout Zoom Range Provides 1:3 Macro Magnification Ratio

The AF28-300mm F/3.5-6.3 XR Di VC MACRO boasts an MFD (minimum focusing distance) of 19.3” (0.49m) over the entire zoom range, a top-class close focusing capability among high power zoom lenses for full-size format SLR cameras, which provides the remarkable maximum macro magnification ratio of 1:3 at the 300mm telephoto end.

Internal Surface Coatings Minimize Ghosting and Flare

Through the use of “Internal Surface Coatings” (i.e., multiple-layer coatings on cemented surfaces of plural elements) and multiple-layer coatings to prevent reflections from lens surfaces, ghosting and flare due to reflections that occur when light enters through the front element as well as reflections caused by the imager itself are reduced to the absolute minimum.

Ultra-High Zoom Power, yet Lightweight and Compact Design Thanks to New Mechanical Devices

Tamron has reviewed the roles that respective barrel parts play in order to achieve the high power, compactness and light weight. As a result, dimensional increases are confined to a mere 0.7” (17.8mm) in overall length and about 5mm in diameter, when compared with the existing AF28-300mm (Model A061), despite the incorporation of the VC mechanism.

Zoom Lock Mechanism for Enhanced Portability

The zoom lock prevents unwanted barrel extension when carrying the lens/camera combination over the shoulder.

Flower-shaped Lens Hood

A flower-shaped lens hood is included as a standard accessory. The special hood provides optimum shading of superfluous light rays that enter from the rectangular frame outside the image field.

SPECIFICATIONS
Model Name	A20
Focal Length	28-300mm
Maximum Aperture	F/3.5-6.3
Angle of View	75°23'-8°15'
Lens Construction	18 elements /13 groups
Minimum Focus Distance	19.3” (0.49m) (entire zoom range)
Maximum Magnification Ratio	1:3 (at f=300mm, MFD=0.49m)
Filter Diameter	Ψ67mm
Overall Length	3.9” (99mm)*
Maximum Diameter	Ψ3.06” (Ψ78.0mm)
Weight	19.4oz (550g)*
Diaphragm Blades	9 blades
Minimum Aperture	F/22~F/40 (28mm~300mm)
Standard Accessory	Flower-shaped lens hood
Compatible Mounts	Canon and Nikon
*Values given are for Nikon AF-D cameras; the cosmetic design and specs are subject to change without notice.