Sigma is the popular manufacturer of high-performance lenses for Canon, Nikon, Sony/Minolta and Pentax. They also produce their own Sigma line of cameras both in the DSLR and compact categories. Sigma is a Japanese company that has been in the imaging business since 1961 with its own design division in Tokyo and product factory in Aizu, Japan. Its official website carries the complete line up of lenses, cameras, flashes and accessories it currently manufactures. Sigma has lenses in around a dozen categories including wide angle prime, angle zooms, fisheye lenses, standard zooms, standard prime, macro lenses, telephoto zoom, super telephoto and multi-purpose zoom lens, among others.
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