Pentax K-Mount DA 18-270mm f3.5-6.3 ED SDM Interchangeable Lens SDM autofocus system driving by a built in supersonic motor for exceptionally smooth and quiet autofocus operation Incorporates 2 extra low dispersion (ED) elements in its optical design to effectively minimize chromatic aberration and deliver bright, high resolution images. Minimum focusing distance of 1.6' over the entire zoom range Rounded diaphragm blades produce a smooth, beautiful bokeh (out of focus rendition) while minimizing the streaking effect from point light sources Designed for al K-mount cameras