Tamron SP AF 28-75mm F/2.8 XR Di LD Aspherical (IF) Lens For Sony A-Mount
Di : for all DSLRs
Fast, ultra-compact mid-range zoom for digital and film SLRs
This ground-breaking high-speed mid-range zoom is prized by pros and serious shooters for its fast F/2.8 constant aperture, evenness of illumination, and its outstanding imaging performance, and by all photographers for its compact size and reasonable weight that make it feel like an ordinary standard zoom. These admirable characteristics have been achieved by the use of special XR and LD glass, the efficient use of aspherical elements, and non-rotating internal-focus (IF) design. This remarkable zoom lens also focuses down to 0.33m(13") (1:3.9 magnification) at all focal lengths for satisfying close-up performance and is compatible with APS-C and full-frame-format SLRs. Not surprisingly it is widely acclaimed as a classic.
Tamron SP AF 28-75mm F/2.8 XR Di LD Aspherical (IF) Lens For Sony
SP AF28-75mm F/2.8 XR Di LD Aspherical (IF) MACRO (Model A09)
The world's smallest and lightest standard zoom lens featuring F/2.8 throughout the range
Now realized thanks to XR technology, Tamron brings you this light and small fast zoom. Unlike typical fast zooms, it weighs only 510g, with filter size of 67mm and overall length of 92mm. The optical performance is of course outstanding with the employment of an optical system using two XR elements, three LD elements, and four aspherical elements. All of Tamron's zoom lens technology comes together.
F/2.8 Constant Maximum Open Aperture throughout the Zoom Range, Yet Compact
The relative aperture (i.e., aperture of a lens) is the focal length divided by the clear aperture (the actual size of the effective diameter where light actually passes through). Therefore, it is comparatively easy in terms of size, to make an aperture fast at the wideangle end of a zoom lens, whereas it is rather difficult to achieve the same aperture at the telephoto end. And to make an aperture at the tele-end as fast as that of its wide-end, a lens tends to become quite bulky.
Now, Tamron brings you this ultra-compact zoom lens that does not change its maximum aperture throughout the zoom range, even at telephoto! This allows use of the same high shutter speed even when the lens is zoomed to prevent camera shake and freeze motion. Plus, the beautifully blurred background effects that are desired from telephoto lenses can be attained.* We believe a lens that features F/2.8 maximum open aperture throughout the entire zoom range, even at its telephoto end is worthy of "a real fast zoom lens" designation. The technology that enables us to realize this compact fast zoom lens is a technology of which Tamron is proud of.
*To prevent camera shake, you should set your shutter speed to the reciprocal of the focal length (e.g., f=28mm requires 1/28 sec, while a fast 1/75 sec is required at f-75mm).
Special Glass Materials such as LD, XR, ASL Are Used in Abundance
Various types of special glass materials such as LD glass, XR glass and Aspherical lens elements are used in order to achieve the amazingly compact design and outstanding specifications not found in conventional lenses and to ensure high image quality.
The Most Compact and Lightweight in the History of Fast Zoom Lenses
Thanks to the revolutionary downsizing "XR" technology employed by Tamron in the development of high-power zoom lenses such as the 28-200mm and 28-300mm, the dramatic compactness that makes this lens the world's smallest and lightest* is achieved. So your previous expectations of " I bought a fast lens, but it is too heavy and bulky to carry around" - need not be repeated. Tamron's new fast standard zoom is a lens recommended to those photographers who have had this experience. Its compactness makes it look and feel like an ordinary standard zoom lens (of F/3.5-4.5), yet the versatility that a fast constant maximum aperture offers will definitely reshape your photographic horizons. (*As of March 2003. Based upon Tamron research of lenses in the same class)
"Di" - New Standard of Lenses for Digital Cameras
Di ("Digitally Integrated Design") is a designation Tamron puts on lenses featuring optical systems designed to meet the performance characteristics of digital SLR cameras.*
(*The same high performance is delivered when used with conventional AF cameras using silver halide film.)
MOD 33cm (13") over the Entire Zoom Range
MOD (Minimum Object Distance) of 33cm (13"), the closest focusing distance among lenses in this class, has been realized. A maximum macro magnification ratio of 1:3.9 can be achieved at the 75mm focal length setting.
Zoom Lock Mechanism and Flower-shaped Hood Are Standard
Even minute aspects are carefully considered by the employment of such features as the zoom lock mechanism designed to prevent self-sliding/extension of the lens barrel while carrying the lens/camera around. And the flower-shaped lens hood, designed to effectively cut unnecessary stray light that causes flare and ghosting, comes as a standard accessory.