Go shopping for a smartphone today and one of the features you'll want to pay close attention to is the rear-facing camera, which may come with multiple lenses.
Each camera has a lens for directing light and a sensor for capturing it, both of which affect the quality of the finished shot. In recent years, manufacturers have added more and more lenses to the back camera, spawning designations such as "dual-lens" and "triple-lens." The upper end of the spectrum is occupied by phones such as the Nokia 9 PureView, which has five, but is more really better? What exactly do these extra lenses do?