Sigma today launched two new lenses for the Nikon mount. Both lenses will work with all Nikon DSLR cameras, including the new entry-level D40 and D40x. The Sigma 18-50mm f/3.5-5.6 DC HSM and 55-200mm f/4-5.6 DC HSM lenses are equipped with Sigma’s HSM (Hyper Sonic Motor) system for quiet auto focusing. The 18-50mm F3.5-5.6 DC …
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