Sigma Corporation is pleased to announce the launch of the new 17-70mm F2.8-4.5 DC MACRO HSM for Nikon and 18-50mm F2.8 EX DC MACRO HSM for Nikon.   Large aperture standard zoom lens designed specially for digital SLR cameras.
The HSM system has been incorporated into this large aperture standard zoom lens for digital SLR cameras. This lens is capable of autofocusing with all Nikon DSLR cameras (including the D40 and D40x) and has a minimum focusing distance of 20cm (7.9”) and maximum magnification of 1:2.3 enabling close-up photography. A Special Low Dispersion (SLD) lens and Aspherical lens allows a compact construction and high optical performance. Read the whole announcement and the technical details here