The lens lineup between Nikon and Canon is similar, but in some areas there are some distinct gaps where one manufacturer has covered a base more solidly than the other. The ''vacation lens'' category, encapsulating a wide range of focal lengths, is one such area: when Nikon released its 18-200mm ƒ/3.5-5.6 VR in November 2005, the lens was so popular it was back-ordered for months. With this release by Canon, we imagine it will be equally popular.
Small and light, the reduced-frame EF-S 18-200mm lens represents a field of view of approximately 29-320mm in 35mm terms. As an EF-S lens, it will not mount on Canon's 1.3x, or full-frame camera bodies (as well as some older APS-C dSLR bodies). To economize and create a more efficient design, the lens is equipped with a variable aperture; as the zoom extends the focal length, both the smallest and the largest apertures change. Read the whole article here. You can buy the lens here