Panasonic Lumix G 20mm f/1.7 II ASPH. LensCharacterized by its slender profile, the black Lumix G 20mm f 1. 7 II ASPH. from Panasonic is a compact, slightly wide 40mm equivalent prime for Micro Four Thirds mirrorless cameras. Its bright f 1. 7 maximum aperture offers notable control focus for working with shallow depth of field techniques and also benefits working in difficult lighting conditions. The optical design incorporates a pair of aspherical elements to suppress spherical aberrations