Equipped with Pentax's most advanced optical technology - the HD Pentax DA 20-40mm ED Limited DC WR offers flexible focal length and versatile settings while unleashing your creativity. The HD Pentax DA 20-40mm ED Limited DC WR lens offers Pentax's weather sealed body with HD coating to protect against rain and dust. The lens has nine elements in eight groups with one extra low dispersion lens element, SP coating, fast f/2.8 aperture with nine rounded diaphragm blades producing a striking bokeh for exceptional visual expression, DC (in-lens direct current) focus motor ensuring quiet and smooth autofocus. It's 20-40mm focal length is equivalent to 305 - 61.5mm focal length in 35mm format. The HD Pentax DA 20-40mm ED Limited DC WR lens provides versatile and standard wide-angle shooting.