FEATURE SUMMARY

Dedicated for digital SLR cameras

By incorporating an optical design for exclusive use with digital SLR cameras with smaller-size imagers, this high-power zoom lens provides the same focal length, when converted to a 35mm format, equivalent to Tamron's 28-300mm. Therefore, you can meet virtually every photographic opportunity with this single zoom lens without changing lenses. When paired with the ultra-wideangle SP AF11-18mm zoom, you can thoroughly enjoy digital SLR photography with a combined equivalent focal length coverage of 17-300mm.

Optical system uses special glass and is optimised for digital SLR characteristics in order to enhance optical quality in a compact design

The new AF18-200mm high power zoom lens from Tamron features an entirely new optical design using XR (Extra Refractive Index) glass in an innovative way in order to optimize the overall distribution of optical power throughout the entire zoom range. This design reduces various aberrations to the absolute minimum and achieves remarkable downsizing at the same time. In addition, three hybrid aspherical lens elements and two LD (Low Dispersion) glass elements are used to accomplish effective compensation of on-axis and lateral chromatic aberrations, a critical factor to enhance the optical quality in digital photography. As a result, this lens is truly multi-purpose but still provides outstanding image quality.

Optical design dedicated to digital SLR photography by optimising the angles of incidences of light rays reaching the image sensor

The zoom lens uses a new optical system designed to confine the changing angles of incidences of light rays reaching the imager within a certain scope over the entire image field from the center to the periphery, by considering the effects of variances due to zooming.

Enhanced peripheral illumination

Peripheral light fall-off is minimised when compared with that of conventional lenses for film cameras so that images are uniformly bright from the centre to the periphery.

Outstanding resolution

Since the lens is designed exclusively for digital SLR photography, it provides high image quality in terms of resolution, contrast and flatness of image field.

Internal surface coating to reduce ghosting and flare

Ghosting and flare caused by aberrations are annoying factors in digital SLR photography, so Tamron has adopted various countermeasures against the problem including the employment of “Internal Surface Coatings” (i.e., multiple-layer coatings on cemented surfaces of plural elements) and new multiple-layer coating technology on ordinary elements in order to minimise reflections that occur when light enters through the front element and to reduce image degrading effects caused by the imagers themselves.

Revolutionary minimum focus distance – 0.45m (17.7") for 1:3.7* macro capability

It is an important condition for a multi-purpose zoom lens to provide the capability of getting close to the subject. The new 18-200mm zoom lens realises an MFD (Minimum Focus Distance) of 0.45m (17.7") through the employment of a new optical/mechanical design configuration. Since the maximum magnification ratio at 200mm is 1:3.7*, you can enjoy close-up photography easily and conveniently.

* The Maximum Magnification Ratio of this lens is 1:3.7 while the Maximum Magnification Ratio of the AF28-300mm (Model A061) is 1:2.9. However, the 18-200mm can fill the frame with almost the same scope as the A061 does when shooting with a 35mm SLR camera, since the new lens is exclusively designed for digital SLR cameras with smaller-size imagers. The Maximum Magnification Ratio of 1:3.7 is equivalent to 1:2.8 when converted to 35mm film format.

High power, yet compact and lightweight thanks to newly developed mechanisms

New and complex mechanisms are hidden in this lens' compact construction. Several engineering innovations were required to downsize the design, produce high-precision parts and increase durability, imbuing this multi-purpose zoom lens with excellent portability and ease of use.

Zoom Lock mechanism

The Zoom Lock prevents unwanted barrel extension when carrying the lens/camera combination.

Flower-shaped lens hood

A glare-reducing 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.

New external design on the Di-II series conveys "high-performance, high-precision" image

Improvements have been made to the external design by adding a gold-colored band between the focus and zoom rings to enhance the appearance and make it stand out as a Di-II lens. The rubber patterns of the zoom and focus control rings have been improved at the same time to complement the digital camera design style and to provide better handling.

SPECIFICATIONS