The 18-200mm f/3.5-6.3 DC Macro OS HSM Lens For Canon Digital Cameras from Sigma
is an all-in-one lens covering an 11x zoom from wide-angle to
telephoto, with a 35mm equivalent focal length of 29-320mm. An optical
stabilizer (OS) system is built into the lens, which reduces the
appearance of camera shake. This can be especially helpful when shooting
at long focal lengths or up-close macro shots. OS also allows you to
use slightly longer shutter speeds, making it possible to shoot
hand-held in low-light conditions. The built-in Hyper Sonic Motor
delivers quick and quiet autofocus.
The 18-200mm's optical design
incorporates double-sided aspherical lenses which enable this extended
super-zoom lens to be housed in a compact and lightweight construction.
Special Low Dispersion (SLD) glass, correct chromatic aberrations, and
Super Multi-Layer Coating reduces flare and ghosting, to provide sharp,
high contrast images even in backlit conditions.