SIGMA 17-50mm F2.8 EX DC OS HSM

The Sigma Corporation is
pleased to announce the new Sigma 17-50mm F2.8 EX DC OS HSM. This large
aperture standard zoom lens is designed for digital SLR cameras and
incorporates Sigma’s efficient OS function. It is a compact lens with
an overall length of just 91.8mm (3.6”).

This lens covers a focal length from 17mm wide angle and offers a
large aperture of F2.8 throughout the entire zoom range, making it
ideal for many types of photography such as portraiture and
landscapes.  The OS (Optical Stabilizer) function offers the use of
shutter speeds approximately 4 stops slower than would otherwise be
possible. 

For Sony and Pentax mount, the built-in OS function of this lens can
be used even if the camera body is equipped with an image sensor shift
anti-shake system. As compensation for camera shake is visible in the
viewfinder, the photographer can easily check for accurate focus and
ensure there is no subject movement. 

Two FLD (“F” Low Dispersion) glass elements, which have performance
equal to fluorite glass, plus two glass mold and one hybrid aspherical
lens, provide excellent correction for all type of aberrations.  The
Super Multi-Layer Coating reduces flare and ghost.  This lens has
superior peripheral brightness and provides sharp, high contrast images
even at the maximum apertures. 

High image quality is assured throughout the entire zoom range. 
Incorporating HSM (Hyper Sonic Motor), the lens provides fast and quiet
AF.  The lens has a minimum focusing distance of 28cm (11”) throughout
the entire zoom range and a maximum magnification ratio of 1:5.  The
rounded 7 blade diaphragm creates an attractive blur to the out of
focus images.  The inner focusing system eliminates front lens
rotation, making the lens particularly suitable for use with the
supplied petal-type lens hood and circular polarizing filters.