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Sigma 17-35mm EX DG HSM lens introduction
Dennis Hissink : November 18th 2003 - 01:00 CET
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SigmaSigma 17-35mm EX DG HSM lens introduction : Sigma was the first brand to introduce the wide angle zoom lens. Back in 1979 Sigma unveiled their Sigma Zoom Gamma 21-35mm f3.5-f4 lens. From that year on Sigma developed the wide angle zoom lens into the lenses we know today. Sigma is adding another wide angle zoom lens to its series of lenses. This new lens, a successor of the Sigma 17-35mm f2.8-f4 EX Aspherical HSM lens will have a revised optical and mechanical design to provide a better performance. The new lens, Sigma 17-35mm f2.8-f4 EX DG HSM Aspherical lens, covers a super-wide angle of view 104?and has a large-aperture. It has a minimum focusing distance of 27mm at all focal lengths, and maximum magnification ratio of 1:4.5.
Sigma 17-35mm EX DG HSM lens introductionSigma EX DG lens - High Performance
The models which are equipped with HSM (Hyper Sonic Motor) system are ensured a quiet, high-speed AF as well as offering Full Time Manual Focusing. Special Low Dispersion (SLD) and 2 aspherical glass elements provide excellent compensation for distortion as well as for various aberrations. The lens is especially suitable for the characteristics of Digital SLR Cameras. The high performance inner focus system is particularly suitable for using circular polarizing filters and a petal-type hood as the front of the lens does not rotate.

Sigma AF 17-35mm F2.8-4 EX DG ASPHERICAL / HSM specifications
- Focal Length of 17-35mm
- Minimum Aperture of F22
- Lens Construction: 16 Elements in 13Groups
- Inner Focusing System
- Angle of View: 103.7?-63.4?
- Number of Diaphragm Blades: 8pcs
- Minimum Focusing Distance of 27cm
- Maximum Magnification: 1:4.5
- Filter Size of 77mm
- Petal Hood
- Dimensions: diameter 83.5mm x length 86.2mm
- Weight of 560g
- Available in January, 2004
- Mounts (AF): Sigma, Canon; available on December, 12th 2003, Nikon (D); available toward the end of December 2003, Minolta (D), Pentax.

   Sigma zoom lenses introduction
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