For over 40 years, Sigma has been one of the leading manufacturers and innovators in lens design. Their selection of products covers the entire spectrum of a photographer's needs. As the industry transitioned into the digital age, they became one of the pioneers in the creation of lens solutions specifically designed for digital cameras; they manufacture lenses for a wide range of camera brands, such as Canon and Nikon, and for both traditional film and digital cameras. Amateur photographers often wonder why so much emphasis is placed on the lens. In fact, as digital photography has become more widespread, many have placed too much focus on specs such as mega-pixels, overlooking the importance of using a quality lens. Even in the digital realm, your pictures will only be as good as the lens you use to capture them. The reason for using a quality lens, such as a Sigma camera lens, is simple. The lens is what allows light to travel to either the film or sensor within the camera. Any aberration, scratch or problem with the lens will appear on the picture. Additionally, if the lens uses inferior parts, less light will be able to travel to the camera, thus lowering picture resolution--no matter how many mega-pixels your camera may be equipped with. A Sigma camera lens is a very sensitive product. Since a lens is almost entirely composed of glass, it is imperative to treat it with incredible care. It is also important to make sure that the Sigma camera lens you purchase is compatible with your brand of camera. Different cameras utilize different mounts--it is key for the two to match. | 
