Thursday, December 6, 2007
Tamron Launches AF18-250mm Di II With Built-In Motor For Nikon Mount
Optical Design Dedicated for Digital SLR Photography by Optimizing the Angle of Incidence of Light Rays Reaching the Image Sensor
The zoom lens uses an optical system designed to confine the changing angles of incidence of light rays reaching the imager within a certain scope over the entire image field by considering the effects of variance due to zooming.
Since the lens is designed exclusively for digital SLR photography, it provides high image quality resolution, contrast and flatness of image field.
Internal Surface Coating to Reduce Ghosting and Flare
Through the use of "Internal Surface Coatings" (i.e., multiple-layer coatings on cemented surfaces of plural elements) 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 imager itself are reduced to the absolute minimum.
Ultra High Zoom Power, yet Lightweight and Compact Design Thanks to New Mechanical Devices
Complicated mechanisms are built into the compact body, thanks to new mechanical devices, for excellent portability and ease of use. Based on the mechanical construction of the AF28-300mm (Model A061), Tamron has revolutionized accumulated mechanical design technologies by reviewing the roles respective barrel parts play in order to achieve the high power, compactness and light weight. Additionally, the production engineering has been completely overhauled to downsize its parts and to increase their precision and durability in order to accommodate the complex structure in the new zoom lens. 44 In order to realize the 13.9X high zoom power, the lens uses a metal mount in all fittings.
Zoom Lock Mechanism Incorporated
The zoom lock prevents unwanted barrel extension when carrying the lens/camera combination.
Flower-shaped Lens Hood
A 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 of the New Di-II Series Conveys the Image of "High Performance, High Precision Improvements have been made to the external design by adding a gold-colored and between the focus and zoom rings to enhance the appearance and make the product stand out as a Di-II lens. Also, the black coating over the entire lens barrel creates a high-quality, sophisticated look. The focus and zoom rings use ergonomic rubber patterns to provide better handling and a design that complements the camera style.
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