Nothing matches the presence and clarity of a wide-aperture lens that's designed for a single focal length. Lenses that meet this description are called "fast primes," because they gather lots of light and they aren't zoom lenses. The optical pathway is less complex than on a zoom lens, and so the images are often breathtakingly sharp. This lens is ideal for isolating your subject in space while blending the foreground and background into a pleasing, soft blur. Wedding photographers will find this Sigma 85mm f/1.4 a "go-to" lens, because of its ability to capture images with emotional resonance in less than ideal lighting. The large maximum f/1.4 aperture lets in plenty of light, allowing faster shutter speeds to "freeze" moving subjects. It also makes it perfect for shooting indoors when the lights are low.