Panasonic Leica DG Vario-Summilux 10-25mm f/1.7 ASPH. LensA unique lens with a distinctly bright design, the Leica DG Vario Summilux 10 25mm f 1. 7 ASPH. from Panasonic is a 20 50mm equivalent zoom for Micro Four Thirds mirrorless cameras. The impressively fast f 1. 7 constant maximum aperture enables improved depth of field control and low light shooting capabilities throughout the zoom range. Balancing the impressive f 1. 7 performance, the optical design incorporates a series of low dispersion,