Sigma 18-200mm f/3.5-6.3 DC Lens for Pentax and Samsung Digital SLR Cameras

High zoom ratio (11:1) lens designed for Pentax digital SLR cameras18 to 200 mm focal length2 Special Low Dispersion glass elements; 2 hybrid aspherical lensesCompact, lightweight constructionLens coating reduces flare and ghosting
Product DescriptionThe lens design incorporates an inner focusing system%2C which prevents the front of the lens from rotating%2C making it particularly suitable for using circular polarizing filters and petal shaped lens hoods%2E The overall length of the lens

Source: Digital Camera and Video Store...