Compare 50mm F2.8 EX DG Macro for Sigma Digital SLR to Sigma 18-200mm f/3.5-6.3 for Canon

MACRO 50mm F2.8 EX DG incorporates the very latest optical technology and is an ideal standard lens for digital SLR cameras. The new advanced lens design corrects various aberrations. This macro lens is specially coated to get the best color balance whilst cutting down ghost caused by reflections from the digital image sensor. This lens provides the utmost correction against lateral chromatic aberration which is a serious problem for digital SLR cameras. Less

This high zoom ratio lens is exclusively designed for digital SLR cameras and 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 offer the utmost correction for all types of aberrations, and enables this extended range super zoom lens to be housed in a compact and lightweight construction of 70 millimeter (2.8 inches) diameter, and 78.1 millimeters (3.1 inches) in length, and weighing just 405 grams / 14.3 ounces. The new lens coating reduces flare and ghost, which is a common problem of digital cameras and also creates an optimum color balance. This lens has a minimum focusing distance of 45 centimeters (17.7 inches) at all focal lengths and has maximum magnification of 1:4.4. Less