The Panasonic Lumix G 20mm f/1.7 II ASPH lens 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 and distortion for high sharpness and accurate rendering, and individual elements have also been multi-coated to control surface reflections and flare for improved contrast in strong lighting conditions.