SP AF28-75mm F/2.8 XR Di LD Aspherical [IF]
Model A09

This lens utilises the XR size-reduction technology developed for the AF28-200mm XR Super Zoom and AF28-300mm XR Ultra Zoom to create a fast standard zoom lens. Furthermore, the XR design contributes to the lens' almost unbelievably compact size for a lens of this type – featuring a filter diameter of 67mm, maximum diameter of 73mm (2.9"), and length of only 92mm (3.6"). And at only 510g (17.99 oz), the image of fast standard zooms as heavy and cumbersome is turned on its head. This lens represents the first in a new category: a fast standard zoom that can be used comfortably as the lens regularly attached to a camera body. In addition, to meet the needs of this dual-format (film and digital) world, the optical system of the lens* is designed to provide optimum performance when used with the latest digital SLR cameras.

* Di: "Digitally integrated design", Tamron's designation for lenses featuring optical systems designed to meet the performance characteristics of digital SLR cameras while covering the image circle of 35mm film.

MAIN FEATURES

Tamron XR technology gives birth to the world's lightest and most compact** fast standard zoom lens
Enabling unprecedented reductions in size, XR technology symbolizes the new technologies developed by Tamron for the 21st century. Tamron's XR technology was first used to create the AF28-200mm XR Super Zoom (Model A03) released in April 2001, the world's lightest* 28-200mm zoom, and the AF28-300 XR Ultra Zoom (Model A06) released in June 2002, the world's lightest and most compact* 28-300mm zoom lens. And now the same technology has been employed to create a new member of the SP series. Compactness and lightweight are combined with high performance in the SP AF28-75mm f/2.8 XR to create this unprecedented standard zoom lens.

The revolutionary use of XR (eXtra Refractive index) glass enables reduction in size while at the same time compensating for aberrations, resulting in the optimisation of overall optical power distribution. Through an optimal arrangement of four hybrid aspherical elements, compositional capabilities have been maintained while achieving a reduction in the dimensions of the overall optical configuration. The use of three LD (Low Dispersion) elements ensures superb image quality.

* As of August 31, 2002. Based on Tamron surveys of lenses in the same class.

Minimum object distance of just 0.33m (13") over the entire zoom range, and maximum magnification ratio of 1:3.9
The SP AF28-75mm f/2.8 XR boasts a minimum object distance (M.O.D.) of just 0.33m (13") throughout the zoom range. At its telephoto end, macro shooting is available with a maximum magnification ratio of 1:3.9. While the M.O.D. of the earlier SP AF28-105mm f/2.8 changed according to focal length setting (0.5m/19.68" at 28mm and 105mm, 0.44m/17.32" at 70-85mm), improvements to the optical and structural design have enabled the reduction in the SP AF28-75mm's M.O.D. to a constant 0.33m/13".

Structural innovations enable significant downsizing, reduction in zoom torque and torque fluctuation
Thanks to mechanical innovations that enable a very complex structure to be compressed into a compact barrel, the maximum lens diameter has been downsized considerably to a mere 73mm (2.9"). Handling is enhanced with the reduction of zoom torque and improved torque fluctuation. Tamron has also implemented advancements in manufacturing technology, enabling the production of lighter, stronger and higher precision parts.

Convenient zoom lock for photographers on the go
The SP AF28-75mm f/2.8 XR incorporates a convenient zoom lock mechanism that keeps the lens retracted when being carried on a camera, therefore helping to prevent the lens from accidentally being knocked or bumped when walking through crowds and the like.

Standard accessory flower-shaped hood with excellent stray-light shielding properties
Supplied as a standard accessory, Tamron's flower-shaped hood effectively cuts out stray light while staying out of the frame itself, resulting in clear and vivid images.

Form and texture that embodies the high-performance, high-precision qualities of the SP series, and a design to match a new generation of lenses
This lens features the two gold metal rings that symbolize the SP series, and other design elements that boost its looks and make it even more recognisable as a Tamron SP series lens. A more detailed pattern has been employed for the rubber covering of the zoom and focus rings to improve grip and visual uniformity when the lens is attached to a camera body. The SP AF28-75mm features a sleek burnished-black finish on the lens barrel to impart a further touch of refinement.

Tamron has also improved the readability of important imprinted information on the lens such as the distance scale and f-numbers.

SPECIFICATIONS

NOMENCLATURE

Digitally Integrated Design

Di is a Tamron designation that applies to lenses that have been optimised for digital capture using advanced multi-coating techniques and optical designs that assure excellent image quality across the entire picture field. Because of these characteristics, Di lenses provide outstanding performance on cameras with full-frame and APS-C format sensors as well as on 35mm film.

Super Performance series

Tamron SP (Super Performance) series is a line of ultra-high-performance lenses designed and manufactured to the exacting specifications demanded by professionals and others who require the highest possible image quality. In creating SP lenses Tamron’s optical designers put their foremost priority on achieving superior performance parameters – they are all designed to a higher standard with little regard for cost constraints. As a result, Tamron lenses bearing the SP designation feature impressive and innovative designs that have established an enviable reputation for excellence among those knowledgeable photographers that demand the very best.

Extra Refractive Index

XR (Extra Refractive Index) glass can bend light rays at steeper angles, thereby decreasing the physical length of the lens while enhancing imaging performance by minimising optical aberrations. This has allowed Tamron to develop a line of shorter, smaller-diameter, lighter lenses without sacrificing lens speed, actually upgrading image quality compared to older designs.

XR glass is costlier than conventional glass but it yields enhanced optical power distribution, making possible many of the outstanding and innovative lens designs that bear the XR designation.

Low Dispersion

Chromatic aberration occurs when a lens element refracts different wavelengths of a ray of light – its rainbow colours – at very slightly different angles. This results in the 'colour fringing' that reduces the sharpness of an image. LD elements are made from special glass materials with extremely low dispersion indices (i.e. the refraction of a ray of light into rainbow colours is extremely narrow). Thus they effectively compensate for chromatic aberration at the centre of the field (on axis), a particular problem at long focal lengths (the telephoto end of the zoom range), and for lateral chromatic aberration (toward the edges of the field) that often occurs at short (wideangle) focal lengths. Although costly, LD glass materials result in clear, vivid image quality.

Aspherical

Tamron uses several hybrid aspherical lens elements in its lenses bearing the Aspherical designation. These innovative optics achieve the ultimate in image quality while producing lenses that offer remarkable zoom ranges in extraordinarily compact packages. These cutting-edge advances have advanced the state of optical design by virtually eliminating spherical aberration and image distortion from Tamron's high-power-zoom series.

As one hybrid aspherical lens element can take the place of multiple elements without compromising performance, remarkably compact long-range lenses can now deliver a uniformly high level of image quality across all focal lengths and apertures.

Internal Focusing

Tamron's internal focusing (IF) mechanism provides numerous practical benefits to photographers including:

• a non-rotating front filter ring that facilitates the positioning of polarising and graduated filters
• more predictable handling because the lens length does not change during focusing
• a much closer minimum focusing distance (MFD) throughout the zoom range
• improved optical performance by minimising loss of illumination at the corners of the image field (vignetting)
• suppression of other aberrations that become more troublesome at different focusing positions.

Specifications, design, product name and standard accessories may differ by country or area. While every effort has been made to ensure accuracy, these matters are subject to change by the manufacturer without notice or obligation.

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