The Panasonic Leica DG Summilux 9mm f/1.7 ASPH. The lens is a close-focusing wide-angle prime ideally suited for landscapes, cityscapes, and close-up scenes. Featuring a unique half-macro design, this lens offers a minimum focusing distance of just 3.7", making it an excellent choice for photographing and filming everything from close-ups of plants and small details to street scenes and vistas. Optimized for video as well as stills, the lens provides smooth and near-silent autofocus performance to complement movie recording applications, and the lens is also compatible with micro-step aperture control, which enables smooth exposure changes while recording video. Two extra-low dispersion elements and one ultra-high refractive index element work to minimize color fringing and chromatic aberrations for increased color fidelity, edge-to-edge sharpness, and high resolving performance. Excellent video performance with a mechanical design that suppresses focus breathing. Also compatible with micro-step aperture control, which enables smooth exposure changes while recording video. Bright f/1.7 maximum aperture is well-suited to working in difficult and low lighting conditions and also affords greater control over depth of field for selective focus techniques. A rounded seven-blade diaphragm contributes to a pleasing bokeh quality when making shallow depth of field imagery.