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 Sigma Corp. has introduced the 17-70mm f2.8-4.5 DC Macro, a large aperture standard zoom lens designed specially for digital SLRs. The lens, which features an APS-C size image sensor, has a minimum focusing distance of 7.9 inches throughout the entire zoom range. Maximum magnification of 1:2.3 enables the users to shoot close-up photography like a macro lens.
The new lens design and multi layer lens coating reduce flare and ghosting, which is a common problem with most digital cameras. A special Low Dispersion (SLD) lens and two aspherical lens elements provide excellent correction of all types of aberrations and produce a high level of optical performance throughout the entire zoom range.
The lens also features a large aperture of F2.8 at 17mm wide angle and yet it is compact, with an overall length of 3.1 inches and diameter 3.2 inches. It is said to perform ideally even in relatively low light conditions indoors or at dusk.
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