Sigma 18-200mm f/3.5-6.3 DC AF OS (Optical Stabilizer) Zoom Lens for Canon Digital SLR Cameras

Features

• Sigma’s own unique technology OS (Optical Stabilizer) function
  The 18-200mm f3.5-6.3 OS is equipped with Sigma’s own unique OS (Optical Stabilizer) technology.  This system uses two sensors inside the lens to detect vertical and horizontal movement of the camera by moving an optical image stabilizing lens group, to effectively compensate for camera shake.  It also automatically detects panning movement of the camera and compensate for camera shake when shooting moving subjects such as motor sports.
• Excellent Optical Performance
  A Special Low Dispersion (SLD) lens and three aspherical glass elements provide excellent correction for all types of aberrations and produce a high level of optical performance throughout the entire zoom range.  The super multi-layer lens coating reduces flare and ghosting while producing the best color balance.
• Enables close-up photography 
  This lens has a minimum focusing distance of 45cm through entire zoom range with a maximum magnification of 1:3.9 making it very convenient for taking close-up pictures.
• Inner focusing system
  Because the front of the lens does not rotate, circular polarizing filters and a petal-type hood can easily be used.
• Magnification scale
  A magnification scale is displayed on the lens barrel, ensuring ease of use.
• Zoom lock switch mechanism
  A zoom lock switch mechanism is provided to prevent the lens from creeping due to its own weight.

The Sigma 18-200mm high-zoom-ratio lens is designed exclusively for Canon digital SLR cameras and is capable of covering a wide range of focal lengths, from wide-angle to telephoto. Two Special Low Dispersion (SLD) glass elements and two hybrid aspherical lenses correct for all types of aberrations, letting Sigma house the extended-range super-zoom lens in a compact and lightweight body that measures 70mm in diameter and 78.1mm long and weighs a mere 14.3 ounces. The new lens coating, meanwhile, reduces flare and ghost--a common problem shared by many digital cameras--while also creating an optimum color balance. Other details include a minimum focusing distance of 45cm (17.7) at all focal lengths, a high zoom ratio of 11:1, and a maximum magnification of 1:4.4.

The lens design incorporates an inner focusing system that prevents the front of the lens from rotating, making it particularly suitable for using circular polarizing filters and petal-shaped lens hoods. In addition, the overall length of the lens never changes during focusing, making the lens convenient to handle and easy to use. Finally, the lens's zoom lock switch eliminates "zoom creep" during transport--a convenient addition when traveling. The lens, which includes a metal mount, is backed by a one-year warranty.