135mm w/ F1.8 max aperture maintains exposure and depth of field G Master design for extraordinary sharpness and breathtaking bokeh XA Super ED and ED elements achieve edge-to-edge high resolution 11-blade circular aperture contributes to gorgeous bokeh Four XD (extreme dynamic) linear motors: fast quiet precise focus XA (Extreme aspherical) element for high resolution and soft bokeh Super ED/ED (Extra-low dispersion) glass reduces flare and ghosting...