Pentax DA 18-250mm f/3.5-6.3 ED AL IF Lens for Pentax and Samsung Digital SLR Cameras 14x zoom range of 18-250mm makes this the ideal all-around lens ED element and two aspherical elements compensate for chromatic and spherical aberration Focal length equivalent to 27.5mm to 383mm in the 35mm format Lens focuses as close as 18 inches throughout the entire zoom range Internal focus mechanism prevents the front lens element and lens barrels from moving during focusing