Sigma: new macro zoom lens
By
Mike Tomkins
(Wednesday, January 18, 2006 - 10:47 EST)
A press release from Sigma Japan has announced a new zoom lens that focuses to just 20cm across its entire zoom range of 17 - 70mm, promising handy macro capabilities with a maximum magnification of 1:2.3.
The Sigma 17-70mm F2.8-4.5 DC MACRO will be offered in Canon, Nikon, Konica Minolta, Pentax and Sigma AF lens mount versions. Size is a compact 3.2" long and 3.1" diameter, and the lens weighs just 16 ounces. Maximum aperture across the zoom range varies from F2.8 to F4.5, with a minimum aperture of F22. Pricing and availability haven't been announced at this time.
Courtesy of Sigma, specifications and a product photo follow below:
| Sigma 17-70mm F2.8-4.5 DC MACRO |  | | Focal Length: | 17-70mm | | Minimum Aperture: | F22 | | Lens Construction: | 15 Elements in 12 Groups | | Angle of View: | 72.4°-20.2° | | 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 (3.1in")X Length 82.5mm (3.2") | | Weight: | 455gr /16.0oz | | . |
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Original Source Press Release:
| NEW PRODUCT INFORMATION: 17-70mm F2.8-4.5 DC MACRO Large aperture standard zoom lens designed Specially For Digital SLR Cameras. Macro lens level close up ability - 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.
Sigma 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. - 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.
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