Sigma announced yesterday an HSM version of their 17-70 mm and 18 – 55 mm lenses using the Nikon lens mount. HSM stands for Hyper Sonic Motor, which promises quieter and faster focusing. Both lenses are specifically tailored for Nike Digital SLR cameras.
The 17-70 mm model features a minimum focusing distance of 20 cm (7.9 inches). The cameras maximum aperture ranges from F.2.8-F4.5 and a minimum aperture of F22.
The 18-50 mm model has an aperture range from F2.8 to F22.
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