STF™ delivers incomparable bokeh and sharpnessThis 100mm mid-range telephoto prime lens is a superb creative tool that offers outstanding G Master resolution plus innovative STF (Smooth Trans Focus) optics for magnificent bokeh.STF delivers incomparable bokeh and sharpnessThis 100 mm mid-range telephoto prime lens is a superb creative tool that offers outstanding G Master resolution plus innovative STF (Smooth Trans Focus) optics for magnificent bokeh. It features fast, precise, quiet DDSSM autofocus, and close-up capability up to 0.25x magnification. Built-in Optical SteadyShot image stabilization minimizes blur that can occur during low light or macro shooting.Exemplary G Master resolution and bokehAdvanced optics and design achieve extreme resolution and absolutely breathtaking bokeh that combine for overall performance that epitomizes the G Master concept.Bokeh doesn't get better than thisThis lens has been specifically designed to produce extraordinarily smooth, natural bokeh without vignetting. The result is naturally immersive depth and dimensionality. Resolution true to the G Master nameExtreme image-wide resolution and sharpness fulfill the demanding 50 lines per millimeter MTF requirement that is the basis of G Master optical design.AF that lets you concentrate on creating DDSSM (Direct Drive SSM) focus drive provides fast, precise, quiet autofocus, allowing the user to concentrate fully on capturing superlative stills or movies.More detailsLens ConfigurationG Master series lenses take imaging and expression to previously unattainable levels with a stunning blend of extremely high resolution and softly dissolving background bokeh.MTF ChartMTF (Modulation Transfer Function) describes how well a lens can reproduce fine details, measured as the degree of contrast achieved between finely spaced lines.