One of Nokia’s most groundbreaking revelations of Nokia World 2013 was their Refocus app, which isolated the foreground and background, and allowed users to focus on some or all of the picture individually.
It seems it has taken Sony just a few weeks to make a poor copy of the technology, with The Next Web noticing the application on the Sony Xperia Z1 heading for T-Mobile.
Of course a few weeks are not enough to do a great jon and TNW notes:
Unfortunately, Background Defocus requires very specific framing and lighting, so you won’t be snapping selfies on the fly with it. Sony recommends you stand about two feet away from your subject and frame it so the background is at least three feet behind it. When I tried the Z1s at the Sony booth, the phone flashed errors in most situations outside of the demo setup.
That slider UI also look a bit familiar, doesn’t it?