Ever since the dawn of 35mm cameras independent lens manufacturers have produced optics that generally carried a lesser price and was of lesser quality than those offered by the original manufacturer. A few independents however, do make lenses that often meet or exceed the major camera manufacturers’ products. These companies include Zeiss, Sigma, and Tamron.
Sigma, in particular, has produced perhaps the best standard 50 mm lens in its all-new 50mm F1.4 EX DG HSM. Fixed focal length lenses are called “prime lenses” because they do not have to deal with the inherent compromises that the design of a zoom lens demands. Prime lenses are designed to perform extremely well at one focal length. This is important for photographers who need or demand the sharpest image that they can achieve.
This particular new Sigma lens has received wide acclaim, which it richly deserves-- along with many of the other lenses in Sigma's line-up. As do most independent manufacturers, Sigma makes its lenses available to fit Canon, Nikon, Olympus, Sony and Pentax camera bodies, while retaining all of the autofocus and auto exposure capabilities of the original manufacturers’ lenses, with only a few rare exceptions in certain Pentax models.
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