The Tamron 28-75mm f/2.8 Di III VXD G2 is a Sony E-mount zoom offering a versatile wide-to-portrait-length range and bright f/2.8 maximum aperture. Revamped optics yield higher resolution and improved sharpness over the previous generation and the focusing system has been replaced with a VXD (Voice-coil eXtreme-torque Drive) mechanism that achieves faster, more precise performance to suit both stills and video applications. Versatile standard zoom designed for full-frame Sony E-mount mirrorless cameras but can also be used with APS-C models where it will provide a 42-112.5mm equivalent focal length range. Bright constant f/2.8 maximum aperture affords consistent illumination throughout the zoom range and also affords greater control over the depth of field for working with selective focus techniques.VXD (Voice-coil eXtreme-torque Drive) linear motor focus mechanism provides fast, quiet, and precise autofocus performance throughout the zoom range.