• World's first new generation standard zoom lens with an open value of F1.7 across the entire zoom range • The world's first LEICA DG VARIO-SUMMILUX lens achieves an open value of F1.7 across the entire zoom range • Large aperture standard zoom lens that covers the focal length of 5 single focus lenses from ultra-wide angle 20mm to standard 50mm • Both stills and video recording, excellent maneuverability, lightweight, compact, dustproof, and splash-proof for high mobility • Lens Structure: 17 pieces in 12 groups (3 aspherical lenses, 4 ED lenses, 1 UHR lens)