The Tamron 35-150mm f/2-2.8 Di III VXD is an advanced all-in-one zoom characterized by its wide to the medium-telephoto range and its bright maximum aperture. Boasting a maximum wide-open aperture of f/2-2.8 means you can comfortably photograph in available light conditions while also controlling the depth of field and isolating your subject matter with selective focus. Impressively bright f/2-2.8 maximum aperture range for working in available light conditions, controlling depth of field, and isolating subject matter using selective focus.VXD (Voice-coil eXtreme-torque Drive) linear motor focus mechanism provides fast, quiet, and precise autofocus performance throughout the zoom range. The connector port works in conjunction with Tamron Lens Utility software for customizing lens functions and updating firmware through the lens rather than through the camera.