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Published on: 12 March 2017
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Unparalleled optical performance in a fast and steady telephoto zoom lens
In the pursuit to achieve the most outstanding image resolution in the 70-300mm class, Tamron’s Anniversary lens - the SP AF70-300mm F4-5.6 Di VC USD (Model A005) - utilizes an advanced optical design that features a LD ( Low Dispersion) and an XLD (Extra Low Dispersion) lens element made from specialized materials that prevent chromatic aberration. As a result, the SP AF70-300mm F4-5.6 Di VC USD (Model A005) boasts sharper contrast and greater descriptive performance than all others in its class.
ULTRASONIC SILENT DRIVE Tamron’s USD works with the high-frequency ultrasonic vibrations that are produced by a ring called a ‘stator’. Energy from the vibrations is used to rotate an attached metallic ring known as the ‘rotor’. Piezoelectric ceramic, an element that produces ultrasonic vibrations when a voltage of a specific frequency is applied is arranged in a ring formation on the stator. This electrode configuration of piezoelectric ceramic causes two ultrasonic vibrations to occur in the stator. By effectively combining these two ultrasonic vibrations, it is possible to convert the energy from the vibrations that produced simple motion into energy known as ‘deflective travelling waves’, which then moves around the circumference (rotation direction) of the ring. With the USD, the friction between these deflective travelling waves created on the metallic surface of the stator and the surface of the rotor produce force, causing the rotor to rotate. The focusing ring lens, which is linked to the rotor, is thus moved, creating a fast and smooth auto-focus drive.
This combination of best in class image resolution, Ultrasonic Silent Drive and Vibration Compensation is a new achievement of Tamron technology, culminating in the production of a premium 70-300mm telephoto zoom lens.
SPECIFICATIONS TAMRON 17-50mm VC
|Angle of View||34°21′- 8°15′|
17 elements / 12 groups
|Max Magnification Ratio||1:4|
|Overall Length||142.7mm (5.6in)|
|Maximum Diameter||81.5mm (3.2in)|
|Standard Accessory||Flower-shaped Lens Hood|
Canon, Nikon, Sony
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