Sigma 70-200mm f/2.8 DG HSM II Macro Zoom Lens for Pentax Digital SLR Cameras Improved optical performance with a minimum focusing distance of 39.4"/100cm, and maximum magnification of 1:3.5 Two SLD and three ELD glass elements provide excellent correction for all types of aberrations Super multi-layer coating reduces flare and ghosting HSM ensures quiet, high speed autofocus with full time manual focusing APO Tele Converter is available