Blur filters have been around since the early days of Photoshop, but despite being relatively easy to blur pixels, it is tricky to mimic the effects of real optical lens blur. The challenge is to create a realistic fall-off around the point of focus, so the blur gradually becomes stronger the further away in front or behind the point of focus, just like optical blur. With the introduction of the new Lens Blur tool, depth-of-field effects have become a whole lot easier.
