Newly Developed Quad-Cam Zoom Mechanism Provides Exceptional Stability and Precise Focusing throughout Entire Focal Length Range A compact, high-quality 10.7X zoom lens became a reality only when Tamron designed a lens chassis that permitted solid and smooth extension of the lens barrel. The newly developed "Quad-Cam Zoom Mechanism" is the technological marvel which enables four lens barrels to be extended and retracted effortlessly - achieving compactness at 28mm, while holding precise extension at 300mm. (Model 185/285D) Internal Focusing System Delivers 1:3.7 Maximum Magnification Ratio Aside from enhancing lens maneuverability, Tamron's Internal Focusing System provides additional benefits to users. Chief among them is a reduced Minimum Object Distance (M.O.D.) throughout its entire focal length range - 49.6"(1.26m) at 28mm, 24.0" (0.61m) at 200mm and 32.3" (0.82m) at 300mm respectively. Additionally, it improves optical characteristics by minimizing illumination loss at image corners and suppresses aberrations that are caused by focusing positions. Another benefit of Internal Focusing is a stationary filter ring - regardless of the focusing action. Quick and subtle manual focus adjustments are now a snap. (Model 185/285D) Integrated Focus Cam Design Brings Practical Benefit In Zoom Lens Operation Tamron's Integrated Focus Cam precisely optimizes movement of the Internal Focusing System with the newly developed Quad-Cam (Triple-Cam, Model 371/471D) Zoom Mechanism. This ingenious Focus Cam design ensures seamless performance by the highly sophisticated internal lens elements and the advanced external components. Lightweight and High Precision Finish Through Sophisticated Engineering Plastic Technology To ensure high performance without adding weight, Tamron's high-power zoom lenses make extensive use of engineering plastic materials in the critical mechanical components of the lens. The polycarbonate material used in the Tamron High-Power Zoom Lens can be precisely manufactured and offers superb durability. In fact, polycarbonate is the material of choice whenever producing high-precision components that require the strength to withstand heavy use. Sophisticated Production Technology To manufacture a high-power zoom lens that requires such high precision
processes, it is essential to
establish a total production control system that ensures stringent compliance
to each individual design parameter. This is in addition to developing key technologies
such as Aspherical element production and Integrated Focus Cam design. Tamron
is certified with ISO 9002 standards, an internationally
recognized proof of thorough quality control. Tamron's high-power zoom lens series
comes out of a factory that offers world-class capabilities, and is able
to deliver excellent quality products to meet the satisfaction of our
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