Sigma 17-50mm F/2.8 EX DC OS HSM Auto Focus Wide Lens For Canon

Sigma HSM 17-50mm F2.8 EX DC OS Auto Focus Wide Lens For Canon

Third on Sigma's long list of introductions is an image-stabilized fast standard zoom for APS-C SLRs. The 17-50mm EX DC OS HSM offers a slightly wider angle of view than the company's previous models in this class, and alongside optical stabilization also adds a hypersonic autofocus motor for users of all mounts

Recently Sigma announced a couple of lenses featuring their brand new FLD glass and the new 17-50mm f/2.8 OS is among them. FLD glass has an optical characteristic similar to fluorite glass. Such glass elements can be used to compensate optical aberrations (defects) more efficiently than conventional "special" elements such as Sigma's more commonly used SLD glass. Professional Photographers are already impressed by the performance of the Sigma AF 8-16mm f/4.5-5.6 HSM DC which does also benefit from FLD elements so there's some well founded hope that the AF 17-50mm f/2.8 HSM DC OS Lens stands out-of-the-ordinary as well.

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.
 

Kit Content
Sigma HSM 17-50mm F2.8 EX DC OS Auto Focus Wide Lens For Canon
Case
Petal-type Hood