This groundbreaking lens zooms from 17 mm ultra-wide-angle to 50 mm standard, the world's first with such a dramatic zoom range for full-frame mirrorless cameras. TAMRON's new 17-50 mm F4 for Sony mirrorless cameras is a wide-angle zoom lens with a constant F4 aperture that covers the ultra-wide-angle to standard focal length range, ideal for both still and video shooting.