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Sigma 17-70mm DC Macro lens
Dennis Hissink : January 17th 2006 - 02:01 CET
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SigmaSigma 17-70mm DC Macro lens : Sigma announces the launch of the Sigma 17-70mm F2.8-4.5 DC Macro lens. The Sigma 17-70mm DC Macro lens can be used with wide variety of subjects and it is an ideal large aperture standard zoom lens for dSLR cameras featuring APS-C size image sensor. This lens has a minimum focusing distance of 20cm throughout the entire zoom range. Maximum magnification of 1:2.3 enables close-up photography like a macro lens. The lens design and multi layer lens coating reduce flare and ghosting. A Special Low Dispersion (SLD) lens and two aspherical lens elements provide excellent correction for all types of aberrations and produce a high level of optical performance throughout the entire zoom range.
Sigma 17-70mm DC Macro lensSigma 17-70mm lens - Inner focus
This lens offers a large aperture of F2.8 at 17mm wide angle and yet it is compact, with an overall length of 79mm and diameter 82.5mm. It performs superbly even in relatively low light conditions indoors or at dusk. The lens design incorporates an inner focusing system, which ensures fast AF speed as well as prevents the front of the lens rotating, making it particularly suitable for use with circular polarizing filters and petal shaped lens hoods. This lens is also equipped with Zoom Lock Switch that eliminates Zoom Creep during transportation.

Sigma 17-70mm F2.8-4.5 DC Macro lens specifications
- Focal length: 17-70mm
- Minimum aperture: f/22
- Lens construction: 15 elements in 12 groups
- Angle of view: 72.4° -20.2°
- Number of diaphragm blades: 7pcs
- Minimum focusing distance: 20cm
- Maximum magnification: 1:2.3
- Filter size: 72mm
- Lens hood: petal hood
- Dimensions: diameter 79mm x length 82.5mm
- Weight: 455gr

Sigma 17-70mm F2.8-4.5 Macro features
- Macro lens level close up ability
- Minimum focusing distance of 20cm
- Maximum magnification of 1:2.3
- New multi layer lens coating
- Lens design reduces flare and ghosting
- Aspherical and SLD lenses, offer excellent correction for various aberrations
- The lens offers a large aperture of F2.8 at wide angle

About Sigma
∑ SIGMA is the Greek letter equivalent to the English letter "S." In mathematics, it's a sign used to show the total sum. For photographers everywhere, Sigma is the total sum of the research, development, manufacturing and service of the world's leading line of lenses and cameras. Sigma ensures a high, consistent level of quality by processing our own high-performance Special Low Dispersion glass (SLD), metal and resins, surface treatments and other elements right here inside the factory itself. Sigma coordinates the development, production and sales of its technology worldwide through an impressive network of offices in Japan, the United States, Germany, France, United Kingdom, the Benelux countries, Hong Kong and Singapore.

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