The Panasonic 25-50mm f1.7 LEICA DG VARIO-SUMMILUX ASPH Lens combines function with industry-conscious design features resulting in a highly versatile lens, fit for both video and photographic use. With a 35mm full-frame equivalent focal range of 50-100mm, this short telephoto lens is characterised by its wide, bright and fast constant f1.7 maximum aperture. This 9-bladed aperture helps this lens excel in low-light conditions throughout its zoom range as well as offering enhanced control over depth-of-field. Built to Leica Camera AG's strict quality standards, the lens features an advanced optical structure made up of 16 glass elements arranged into 11 groups, including 1 Aspherical, 1 UHR and 3 ED lens elements that contribute to the impeccable image quality. In addition, this optical structure is an impressively fast AF system, focusing clutch design and a stepless, de-clicked aperture ring that's ideal for video use.