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|Product:||Tamron 28-200mm F/3.8-5.6 XR Di Aspherical (IF) Macro|
Tamron introduce a new standard in 28-200mm zoom lenses. - Tamron announce the release of the fourth-generation 28-200mm zoom lens (Model AO3), at over 130g lighter than the AF 28-200mm Super II lens and 25% more compact in terms of body surface and weight
Tamron have focused their efforts on pursuing the ideal of an all-in-one 28-200mm, relying heavily upon the feedback and input from our customers.
Tamron claim their new AF 28-200mm Super Zoom f/3.8-5.6 XR (IF) Macro heralds the launch of a new beginning in lens design and manufacturing. "Following nine years of high-magnification zoom lens development our engineer's have designed new technology, such as XR (Extra Refractive Glass), and a moving triple cam mechanism. Now weighing an astonishing 354g, Tamron are proud to announce the release of the fourth-generation 28-200mm zoom lens (Model AO3), at over 130g lighter than our AF 28-200mm Super II lens and a staggering 25% more compact in terms of body surface and weight. This new lens must become the ultimate companion to any travelling photographer's SLR camera." Stated a spokesperson for Tamron.
Tamron claim that the development of a new optical system, employing XR (Extra Refractive Index) glass and complex Aspherical elements significantly enhances the entire optical power distribution, achieving compactness with excellent aberration compensation.
To enable the lens to extend from a shorter 28mm lens configuration than found in previous 28-200mm models, and provide a two-step extension to the 200mm position with solid, stable action, Tamron have developed a mechanism called moving triple cam. This employs a mechanism based on a two-step lens extension mechanism, which was fixed in previous lenses and enables the entire mechanism to move with the zoom action. By incorporating a new moving barrel into this latest, more compact lens barrel, it was possible to accommodate a complex mechanism in a smaller space.
The overall length of the lens has been reduced by as much as 12mm and the diameter has also been downsized allowing a filter thread size to 62mm.
Technical specification comparing new lens with predecessor
|New AF 28-200mm XR (AO3)||
Old AF 28-200mm Super II (371D)
|Zoom Lock||At 28mm||At 28mm|
|Optics||XR (Extra Refractive Glass)||Low Dispersion Glass|