Experiment with space & perspective a minimum focal length of only 10mm lets you capture striking interior shots as well as dramatic landscapes. Enjoy greater creative control because the F4 maximum aperture remains unchanged even when zooming, you can adjust depth of field more freely. Noise-free shots even in low light with a constant maximum aperture of F4, you can use fast shutter speeds without raising ISO sensitivity unnecessarily. Precise, high quality images three aspherical lens elements minimize spherical aberration & distortion, with less bleed even at maximum aperture. Capture beauty in the blur the signature circular aperture helps create beautifully smooth, rounded blur on the out-of-focus elements in a shot. Rich image quality with Super ED glass Super Extra-Low Dispersion glass reduces chromatic aberrations to sharpen image quality even at the 10mm focal length. Built-in image stabilization when shooting h&-held, particularly night scenes or dimly lit interiors, Optical Steady Shot enables detailed, blur-free results.