Tamron 28-75mm F2.8 Di III RXD,0.19m, an all-new RXD (Rapid extra-silent stepping Drive.The optical formula is comprised of 15 elements in 12 groups, including 1 XLD (eXtra Low Dispersion) element, 1 LD (Low Dispersion) element, 1 GM (Glass-Molded aspherical) element and 1 hybrid aspherical element, and it has an iris diaphragm with nine rounded aperture blades for better bokeh effects.. 
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