When you need a medium-telephoto standard lens for everything from portraiture to sports, the fast Sigma 85mm f/1.4 EX DG HSM Lens for Canon EOS Digital SLRs is a great solution. This large aperture beauty is designed with an SLD (Special Low Dispersion) glass element and a glass mold element which yield first-class, sharp image captures with high contrast. The 85mm f/1.4 has Sigma's HSM (Hyper Sonic Motor) which provides fast, accurate and quiet autofocusing.
This fast f/1.4 lens is great for capturing fast moving images, allowing you to use faster shutter speeds, and is what you want when shooting under low lighting conditions. This highly efficient lens has a nine blade circular diaphragm for creating pleasant out-of-focus highlights (bokeh) which is a major asset to portrait and wedding photographers.