Sigma Press Release:
Sigma Announces 17-70mm F2.8-4.5 Lens for Digital SLR Cameras January 17, 2006 — Sigma Announces 17-70mm F2.8-4.5 Lens for Digital SLR Cameras.
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.
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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.
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.
Optional Accessories
EX Filter Multi-Coated UV72 mm Part #: 00-85126-91245-1
EX Filter Wide Multi-Coated Circular PL72 mm Part #: 00-85126-91255-0
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