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The following is an unedited press release, shown as received from the company represented. We've elected to present selected releases without editorial comment, as a way to provide our readers more information without further overtaxing our limited editorial resources. To avoid any possible confusion or conflict of interest, the Imaging Resource will always clearly distinguish between company-provided press releases and our own editorial views and content.

Tamron's logo. Click to visit the Tamron website! PRESS RELEASE: Tamron Announces AF28-300mm F/3.5-6.3 XR Di VC LD Aspherical [IF] Macro

Tamron Unveils AF28-300mm F/3.5-6.3 XR Di VC LD Aspherical (IF) Macro Equipped with Proprietary Vibration Compensation Mechanism.

Mr. Morio Ono, President of Tamron Co., Ltd., has announced the successful development of the AF28-300mm F/3.5-6.3 XR Di VC LD Aspherical (IF) MACRO zoom lens, a high power zoom lens designed for SLR cameras with full-size format(Model A20), now equipped with a Vibration Compensation (VC) mechanism. The AF28-300mm F/3.5-6.3 XR Di VC is the ultimate high power zoom lens that covers everything from wide-angle to telephoto and macro. Tamron has incorporated a Vibration Compensator, an anti-shake mechanism developed by Tamron, into the highly versatile zoom lens. The new AF28-300mm F/3.5-6.3 XR Di VC LD Aspherical (IF) MACRO zoom lens offers the convenience, comfort and versatility of a high power zoom lens and the capability to reduce hand-shake blur on SLR cameras using either APS-C size or full size format imagers.

When the AF28-300mm F/3.5-6.3 XR Di VC is used with a full size format SLR camera, it covers the tremendous focal length range from 28mm in wide angle to 300mm ultra telephoto. When mounted on a DSLR with an APS-C sized imager, the lens covers a 43mm wide angle to 465mm equivalent ultra telephoto* (full size format equivalent, in a diagonal angle of view of 5.33 degrees).

(*) The ratio Tamron uses to convert from full size format to APS-C focal length is 1.55X.

AF28-300mm F/3.5-6.3 XR Di VC. Courtesy of Tamron, with modifications by Zig Weidelich. Click for a larger image!


1. VC (Vibration Compensation) Mechanism Reduces Hand-shake
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 incorporate a highly accurate gyro sensor for detecting hand-shake, which, combined with a 32-bit RISC CPU, offers comfortable anti-vibration effects.

2. 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 aspherical lens) 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.

3. Revolutionary MFD of 0.49m (19.3") throughout the Zoom Range Provides 1:3 Macro Magnification Ratio
The AF28-300mm F/3.5-6.3 XR Di VC LD MACRO boasts an MFD (minimum focusing distance) of 0.49m (19.3") over the entire zoom range, a top-class closing 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.

4. 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 in the mirror box are reduced to the absolute minimum.

5. 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 17.8mm (0.7") in overall length and about 5mm(0.2") in diameter, when compared with the existing AF28-300mm (Model A061), despite the incorporation of the VC mechanism.

6. Zoom Lock Mechanism for Enhanced Portability
The zoom lock prevents unwanted barrel extension when carrying the lens/camera combination over the shoulder.

7. 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.

Model Name A20
Focal Length 28-300mm
Maximum Aperture F/3.5-6.3
Angle of View 75.38 - 8.25
Lens Construction 18 elements / 13 groups
Minimum Focus Distance 0.49m (entire zoom range)
Maximum Mag. Ratio 1:3 (at f=300mm, MFD=0.49m)
Filter Diameter 67mm
Overall Length 99mm *
Maximum Diameter 78.0mm
Weight 550g*
Diaphragm Blades 9 blades
Minimum Aperture F/22-F/40 (28mm - 300mm)
Standard Accessory Flower-shaped Lens Hood
Compatible Mount Canon and Nikon

* values given are for Nikon AF-D cameras.
* The cosmetic design and specs are subject to change without notice.

(First posted on Saturday, March 10, 2007 at 12:24 EST)

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