Sigma 18-50mm f/2.8 EX DC SLD ELD Aspherical Macro Lens for Pentax and Samsung Digital SLR Cameras Large aperture of f2.8 throughout the entire zoom range Minimum focusing distance of 7.9 inches with a maximum magnification of 3x Aspherical lenses offer compact and lightweight construction SLD and ELD glasses offer excellent correction of color aberrations Designed to fit Pentax and Samsung digital SLR cameras