The 70-300mm f/4.5-6.3 Di III RXD Lens for Sony E from Tamron provides a popular telephoto zoom range for the full-frame Sony E-mount mirrorless cameras.  It offers optical performance with aberration correction that delivers high image quality. The 70-300mm f/4.5-6.3 is a highly-practical telephoto zoom lens that performs across a diverse range of shooting styles including sports and other athletic events, wildlife, portraits, and more.RXD stepping motor unit provides high-speed, high-precision, and quiet operation that takes full advantage of in-camera features including Sony's Fast Hybrid AF and Eye AF features plus direct manual focus. The rounded seven-blade diaphragm contributes to a pleasing bokeh quality.Maximum Magnification Ratio: 1:9.4 (WIDE) / 1:5.1 (TELE)