The 24mm F1.4 GM features an advanced optical design, including two XA (extreme aspherical) elements and three ED (extra-low dispersion) glass elements that delivering outstanding corner-to-corner resolution, even at a wide F1.4 aperture. An11-blade Circular aperture mechanism creates beautiful bokeh that is a hallmark of the g Master series. Fast focusing is attained through the DDSSM (direct drive SSM) focus drive system. This lens sports class-leading size and weight, providing great handling and mobility.