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Sigma announces large aperture standard zoom lens for digital SLRs

Sigma announces the new 17-70mm F2.8-4.5 DC Macro lens,a large aperture zoom lens specially designed for digital SLR cameras featuring APS-C size image sensor. The lens has a minimum focusing distance of 20cm (7.9”) throughout the entire zoom range. Maximum magnification of 1:2.3 enables close-up photography like a macro lens. The lens offers a large aperture of F2.8 at 17mm wide angle and yet it is compact, with an overall length of 79mm (3.1”)...

PRESS SUMMARY

Sigma announces large aperture standard zoom lens for digital SLRs - digital camera and photography newsSigma Corporation is pleased to announce the launch of the new 17-70mm F2.8-4.5 DC MACRO lens.
It can be used with wide variety of subjects and it is an ideal large aperture standard zoom lens for digital SLR cameras featuring APS-C size image sensor.

This lens has a minimum focusing distance of 20cm (7.9”) throughout the entire zoom range. Maximum magnification of 1:2.3 enables 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 digital cameras. 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.

This lens offers a large aperture of F2.8 at 17mm wide angle and yet it is compact, with an overall length of 79mm (3.1”) and diameter 82.5mm (3.2”). 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.


FEATURES

Minimum focusing distance of 20cm, maximum magnification of 1:2.3.
The new multi layer lens coating and lens design reduce 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.


THE SPECIFICATIONS

Focal Length : 17-70mm
Minimum Aperture : F22
Lens Construction : 15 Elements in 12 Groups
Angle of View : 72.4 - 20.2 degrees
Number of Diaphragm Blades : 7pcs
Minimum Focusing Distance : 20cm (7.9")
Maximum Magnification : 1:2.3
Filter Size : 72mm
Lens Hood : Petal Hood
Dimensions : Diameter 79mm (3.1")X Length 82.5mm (3.2")
Weight : 455gr /16.0oz

* The appearance, specifications, and the like of the product are subject to change for improvement without notice.
* Vignetting will occur if the lens is used with digital cameras with image sensors larger than APS-C size or 35mm SLR cameras.
January 17, 2006
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