The lens has a unique optical design that features three fluorite elements and fewer elements on the front barrel. It has an 11 blade circular aperture for smooth bokeh and it’s coated with Sony’s own Nano AR coating, which reduces reflections, glare and ghosting. It’s dust and moisture resistant. The front element is coated with fluorine to minimize dirt and smudges from fingerprints, which tend to accumulate on big pieces of glass like this and includes a 40.5mm drop in filter slot. The lens also features newly developed high-speed XD Linear Motors for fast AF, increased focus tracking and is designed to be quiet—great for shooting sports or wild animals.