An F1.8 135 mm prime with superb resolution, bokeh, and AFUnsparing application of Sony's most advanced optical technologies has produced a large-aperture prime telephoto lens that delivers outstanding corner-to-corner resolution even at F1.8, plus exquisite bokeh that is a hallmark of the G Master series.xa and Super Ed elements deliver high resolutionXA (extreme aspherical), Super Ed (extra-low dispersion) glass, and Ed glass elements precisely deployed in an advanced optical design effectively correct aberration, while a floating focus system works with these aberration correction measures to ensure that the highest possible resolution is maintained right out to the image edges throughout the lens's focus range.