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Tamron AF 18-250mm F/3.5-6.3 XR Di II LD Aspherical (IF) Macro Lens

Filters for this lens:
Circular Polarising Filter (62mm)
UV Filter (62mm)

Details about this Tamron lens:

Maxwell International Australia is pleased to announce the new Tamron AF18-250mm F/3.5-6.3 Di II LD Aspherical (IF) Macro lens, an innovative, lightweight, compact and highly versatile ultra-high-power zoom lens designed exclusively for APS format sensor Digital SLR Cameras.
 
The AF18-250mm F/3.5-6.3 Di-II LD Aspherical (IF) Macro is the ultimate high power zoom lens boasting the world’s greatest zoom ratio* of 13.9X, a milestone that Tamron, the pioneer of high power zoom lenses, has achieved by extending its technology leadership to push the boundaries of “mega zoom” lens design to new limits.
 
The design concept is based on the hugely popular Tamron AF 18-200mm F/3.5-6.3 XI Di-II LD Aspherical (IF) Macro (Model AO14). This prevents the lens size from becoming bulky. The new AF 18-250mm zoom lens provides enhanced image quality from an expanded focal length, now to 250mm at its tele-end, an astounding 13.9X zoom power. This makes the new lens the world’s longest zoom lens in its class. Yet the increase in size is confined to a mere 0.2mm more in its maximum diameter and just 0.6mm in overall length than the 18-200.
 
All of this in a lens that offers a 388mm ultra telephoto focal length (diagonal angle of view of 6 degrees 23’) when converted to an equivalent 35mm film format. It provides an overwhelmingly impressive telephoto effect that is significantly different from the effect obtainable at 200mm on conventional high power lenses. The new zoom lens will satisfy the expectations of photographers that are used to the 300mm tele-end of Tamron’s legendary AF 28-300mm Di (Model A061) when used on a digital SLR camera.
 
In 35mm film format terms, the new zoom lens covers 28mm wide angle to an incredible 388mm telephoto making this a “one lens–does–it-all” design that makes it a perfect travelling companion. There is no a need to carry around a variety of bulky lenses ever again!
 
Tamron engineers have used top quality optical materials and internal lens coatings in advanced designs, to compensate for aberrations that would normally be present in such a high power lens design. High image resolution, contrast, flatness of image field and great colour saturation are achieved though processes that Tamron has pioneered for over a decade.
 
Despite its incredible compact size of 84.3mm long x 74.4mm wide, and weight of only 430g, a minimum focus distance of just 45cm throughout the entire zoom range has been achieved, which allows incredible macro close-up opportunities.
 
The lens will have broad appeal to keen digital SLR users of all leading brands using APS-C format sensor. Designs to suit Canon, Nikon, Pentax, or Sony and Konica-Minolta SLR digital cameras. In the case of Pentax K10D and Sony Alpha 100 owners, the new Tamron ultra-long telephoto lens will be enhanced through the anti-shake technologies built-in to those camera bodies.
 
 
*As of September 2006. Based upon Tamron’s research of lenses for exclusive use with digital SLRs equipped with APS-C sized image sensors. 

 
 
MAIN FEATURES
 
13.9X, the largest Zoom Power in the High Power Zoom Class, Covering an Easy-to-use 28mm Wide-angle to 388mm Ultra Telephoto (when converted to equivalent 35mm film format) – Tamron’s concept for the development of high power zoom lenses is ‘one-does-it-all’, covering wide-angle to telephoto to satisfy customer needs so that the world of digital SLR photography can be enjoyed with a single zoom lens.
Advanced Optical Design Aimed at Optimum Power Distribution to Achieve Compactness and High Power – The optical system uses a LD (Low Dispersion) glass element and one AD (Anomalous Dispersion) lens in the first group to minimize on-axis chromatic aberration, while also achieving 250mm ultra-tele focal length. In addition, suitable positioning of two hybrid aspherical lens elements serves to meet the desired compactness despite its 13.9X zoom power.

Revolutionary Minimum Focusing Distance of 0.45m (17.7”) throughout the Entire Zoom Range Affords a 1:3.5 Macro Capability – The new zoom lens achieves a minimum focus distance of 0.45m (17.7”) throughout the entire zoom range, a top-of-class capability among high power zoom lenses for digital SLR cameras. This results in a maximum magnification ratio of 1:3.5 at the 250mm tele-end.
Optical Design Dedicated for Digital SLR Photography by Optimizing the Angle of Incidence of Light Ray Reaching the Image Sensor – The zoom lens uses an optical system designed to confine the changing angles of incidence of light rays reaching the image sensor within defined limits over the entire image field by considering variations that occur across differing zoom lengths.

Outstanding Resolution – Since the lens is designed exclusively for digital SLR photography, it provides high image quality resolution, contrast and flatness of image field, taking into account the added challenges of aberration, colour fringing and image uniformity across the field.
Internal Surface Coating to Reduce Ghosting and Flare – Through the use of “Internal Surface Coatings” and new multiple-layer coating technology on ordinary elements, ghosting and flare due to reflections that occur when light enters through the front element and reflections caused by the image sensor itself are reduced to the absolute minimum.

Ultra High Zoom Power, yet Lightweight and Compact Design thanks to New Mechanical Devices – Complex mechanisms are built into the compact lens design, thanks to new mechanical developments, for excellent portability and ease of use. Based on the mechanical construction of the AF28-300mm (Model AO61), Tamron has revolutionized accumulated mechanical design technologies by reviewing the roles respective barrel parts play in order to achieve high power, compactness and light weight. Additionally, production engineering has been completely overhauled to downsize parts and to increase their precision and durability in order to accommodate the complex structure in the new zoom lens.

Zoom Lock Mechanism Incorporated – A zoom-lock function prevents unwanted barrel extension when carrying the lens/camera combination pointing downwards.

Flower-petal lens hood – A flower petal shaped lens hood is included as a standard accessory. The special hood provides optimum shading and protection from superfluous light rays that enter from the rectangular frame outside the image field.

New External Design of the New Di-II Series Conveys Image of “High Performance, High Precision” – Improvements have been made to the external design by adding a gold-coloured band between the focus and zoom rings to enhance appearance and make the product stand out as a Di-II lens. Black coating over the entire lens barrel creates a high-quality, sophisticated look. Lastly, the rubber patterns incorporated in the focus and zoom rings have also been improved to compliment digital camera styling and to provide better handling.
 

For more technical information about Tamron lenses, visit Maxwell Australia Tamron site.