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Sigma are a Japanese company which produce cameras, lenses and flashes. They're most widely known for their selection of lenses which are compatible with cameras from other manufacturers.
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Are Sigma lenses comparable to Canon lenses for a Canon camera?
My wife and I own three Sigma lenses: the "bigma" (50-500mm), my 17-70mm f/2.8-4, and her 30mm f/1.4 prime. … And, quite frankly, it's tough to touch Sigma on price. …