The popular, fast prime focal length and the bright f/1.4 maximum aperture of the Sigma 85mm f/1.4 DG HSM Art lens for Leica/Panasonic L-Mount produce beautiful background bokeh while isolating and accentuating the subject, making it perfect for portraits. A series of optical elements work together to minimize chromatic and spherical aberrations, and the HSM autofocus performance is fast, accurate and quiet. Perfect portraits with beautiful bokeh A large-aperture, short telephoto prime lens, the Sigma 85mm f/1.4 DG HSM Art lens is well-suited to a variety of photographic subjects, especially portrait photography, both in-studio and on-location. The fast f/1.4 aperture achieves an exceptionally shallow depth-of-field and smooth, beautiful bokeh. A floating internal focusing system dramatically reduces aberration, and a Thermally Stable Composite (TSC) construction helps ensure minimal thermal shrinkage for greater overall performance in any shooting situation. Optical elements produce crisp, clear imagery Two Special Low Dispersion (SLD) elements in the Sigma 85mm f/1.4 DG HSM Art lens work together to help minimize chromatic aberrations and color fringing, increasing color accuracy. One aspherical element and a partial dispersion/high-refractive index element further reduce distortion, improving overall image clarity. A Super Multi-Layer coating on the lens elements helps minimize ghosting and flaring, generating greater color contrast and precision tonality. Focus quickly and quietly The Hyper Sonic Motor (HSM) in the Sigma 85mm f/1.4 DG HSM Art lens provides fast, smooth autofocusing, all while maintaining near-silent performance. Full-time manual focus is easily achieved by rotating the focus ring.