Panasonic Leica DG Summilux 25mm f/1.4 II ASPH. LensA bright, normal length lens, the Leica DG Summilux 25mm f 1. 4 II ASPH. from Panasonic is a 50mm equivalent prime for Micro Four Thirds mirrorless cameras. Characterized by its fast f 1. 4 maximum aperture, this lens affords notable control over depth of field and is also well suited to working in low light conditions. Its optical design incorporates one UHR element and a pair of aspherical elements to reduce spherical aberrations and distortion, and