Features:

• 18-200mm high-zoom-ratio lens designed for Canon digital SLR cameras
• 2 Special Low Dispersion (SLD) glass elements and 2 hybrid aspherical lenses
• Lens coating reduces flare and ghost; 17.7-inch close focusing distance
• Inner focusing system is suitable for circular polarizing filters and lens hoods
• Measures 2.75 inches in diameter and 3.07 inches long; 1-year warranty

Editor Reviews:

Product Description:
The Sigma 18-200 F3.5-6.3 DC OS HSM Lens incorporates an Optical Stabilizer function and is exclusively designed for digital SLR cameras. It is perfectly suitable for low light conditions whether indoors, at dusk, or in telephoto range. 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 compensates for camera shake when shooting moving subjects such as motor sports. SLD (Special Low Dispersion) glass and aspherical glass provide excellent correction for all types of aberrations. This lens has a minimum focusing distance of 45cm (17.7") throughout the entire zoom range and has a maximum magnification of 1:3.9. Since the inner focusing system means the front of the lens does not rotate, optional circular polarizing filters and the supplied petal-type hood can easily be used. A magnification scale is displayed on the lens barrel, ensuring ease of use. A zoom-lock switch mechanism is provided to prevent the lens from creeping due to its own weight. 69.3 - 7.1 degrees (Sigma SD format) angle of view 7 Diaphragm Blades F22 Minimum Aperture 45cm / 17.7 Minimum Focusing Distance 1 - 3.9 Maximum Magnification Petal Lens Hood Dimensions - Diameter 79mm x Length 100mm Weight - 21.5 ounces (610 grams)

Amazon.com Product Description:
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.

Rating : - SIGMA AF 18-200mm
I HAVE BEEN USING MY NEW LENS FOR WEEKS AND AND ALL I HAVE TO SAY ABOUT THEM IS THEIR "GREAT"!!! I'VE SHOT CLOSE-UPS AND DISTANCE (ONE WITH TWO BUCKS FIGHTING-HORNS LOCKED) AND THE IMAGES HAVE TURNED OUT SUPER. MY FRIEND HAS THE TWICE AS EXPENSIVE NIKON EQUIVALENT AND WE ARE SHOOTING PRETTY MUCH ON PAR. I AM USING THE NIKON D90 AND LOVING IT. MY ONLY CON ABOUT THE SIGMA IS THAT IT IS A LITTLE BULKIER LOOKING THAN HIS NIKON 18-200mm BUT THAT IS ONLY COSMETIC AND I CAN LIVE WITH THAT AND THE PRICE DIFFERENCE!!
GREAT SHOOTING TO YOU ALL!!! RR OF COLORADO