The new 17-70mm F2.8 is Tamron's first high-speed zoom lens for mirrorless cameras with APS-C size sensors. It features a maximum aperture of F2.8 across the entire 4.1x zoom ratio that covers a focal length of 17-70mm that is ideal for regular use (a full-frame equivalent of 25.5-105mm), and superb optical performance. It is a small, lightweight lens that is also equipped with Tamron's VC (Vibration Compensation) mechanism to minimize camera shake. This VC mechanism leverages AI technology when shooting video. The lens features Moisture-Resistant Construction, Fluorine Coating and a φ67mm filter size – the same as the Tamron series of lenses for full-frame mirrorless cameras. Compatible with many of the features that Sony builds into its cameras, including Fast Hybrid AF and Eye AF, the lens is the ideal everyday zoom lens for a multitude of situations. It is a highly practical lens that enables photographers to attain high image quality while enjoying the benefits of the large F2.8 aperture.