The edges are excellent from f/1.7 to f/4 ... Lumix G9 using Imatest. Distortion measures -1.43% barrel at 10mm, changing to minimal pincushion at 12mm (+0.09%), 18mm (+0.05%) and 25mm (+0. ...
Reviews / Panasonic Leica DG Vario-Summilux 10-25mm f/1.7 ASPH Lens Review - Verdict ...