With its long focal length range, the Tamron SP 150-600mm VC USD G2 for Sony A mount is a f/5-6.3 telephoto to super telephoto lens well suited to outdoor photography applications and challenging shooting conditions thanks to a moisture and dust sealed body, Fluorine coated front lens element, and incorporated Vibration Compensation. Highly accurate USD ring-type autofocus and Flex Zoom Lock feature for locking the focal length. 6 year warranty.