The Panasonic LUMIX G 25mm f/1.4 Leica DG Summilux Lens is a Leica DG-Quality mirrorless micro four thirds (MFT) lens, & is designed to provide the ultimate optical performance & quality, with clean optical sharpness, as well as soft-focusing background capabilities. Its bright f/1.4 aperture provides the ability to gather light, even in difficult low-light conditions, while its nano surface coating nearly eliminates ghosting & flaring that can occur with wide open aperture photography. The Leica DG Summilux features a 50mm (35mm camera equivalent) focal length, & features 9 elements in 7 groups, as well as a nano surface coating, for an optimum optical experience. The lens clears the stringent standard, to be "LEICA" certified, which guarantees exceptionally high image-quality.