I have used nokia lumia 520 for about 5-6 years, before going for nokia 5.1 plus. What i feels the camera app performance and functionaliy wise performance not up to the mark of lumia camera app.On manual focus we can get crisp focus in 5 mp lense, and it have automatic night mode, speed mode, and focus for video . Please take a look at the lumia camera app an upgrade the existing one. The manual focus of the camera is outstanding but most of the features of lumia camera is missing here. please check out these shot on lumia 520 5 MP .