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  #1  
Old 15-06-2009
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Join Date: Aug 2008
Posts: 69
Tamron AF 28-300mm lens

Tamron's 28-300mm zoom lens now features our "Di" design, making it the ideal lens for use with both digital and film cameras. The "Di" design is achieved by applying a new optical design to its coated surfaces, and by further enhancing our already stringent quality control system. Whether you shoot film or digital, the lens provides high image quality for both platforms. When used with APS-C size digital SLR cameras, the lens provides an angle of view equivalent to approximately 44-465mm, covering the standard to ultra telephoto range with no sacrifice of quality or aperture range.



Specifications
Model A061
Lens Construction (Groups/Elements) 13/15
Angle of View 75?-8?
Type of Zooming Rotation
Diaphragm Blade Number 9
Minimum Aperture F/22
Minimum Focus Distance 19.3in.(0.49m)
Macro Magnification Ratio 1:2.9
Filter Diameter ?62
Weight 420g (14.8oz)
Diameter x Length ?2.9 x 3.3in.
(?73 x 83.7mm)
Accessory Flower-shaped Lens hood
Mount Canon - Available Nikon - Available
Pentax - Available
Sony - Available
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  #2  
Old 15-06-2009
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Join Date: May 2008
Posts: 5,936
Re: Tamron AF 28-300mm lens

"Di" (Digitally Integrated design) is the designation Tamron puts on lenses featuring optical systems designed to meet the performance characteristic of digital SLR cameras as well as film cameras. Toward Ever Greater Compactness Featuring Key XR Technology Reducing the total length of the optical configuration, we succeeded in developing optics that allow for a smaller lens diameter while maintaining the same aperture values as previous lenses for overall compactness. Optical power distribution was enhanced in a compact package through the innovative use of XR (Extra Refractive Index) glass, resulting in minimum aberration.
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Old 15-06-2009
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Join Date: May 2008
Posts: 5,790
Re: Tamron AF 28-300mm lens

With a short barrel, it is possible to obtain the same visibility (aperture value) as with a long barrel. By using this principle, we were able to shorten the optic system length for a more compact overall lens design while maintaining aperture values. The ASL lens technology compensates for spherical aberration to achieve outstanding image quality. At the same time, reducing the number of elements results in a more compact, lightweight lens package.
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  #4  
Old 15-06-2009
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Join Date: Aug 2006
Posts: 332
Re: Tamron AF 28-300mm lens

You can check the authenticity of the product you have/plan to purchase by locating the silver hologram Tamron USA Authorized Dealer/Six-Year Warranty logo sticker on top of the lens box and/or by completing the Tamron Online Warranty Registration. You may also call Tamron at 1-800-827-8880 to verify the serial number.
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