Microsoft has started rolling out a new Windows Phone update to its range of Lumia devices. Dubbed Lumia Denim, the latest update brings some significant camera improvements to the Lumia 830, Lumia 930, Lumia Icon, and Lumia 1520. The first noticeable change is a new Lumia Camera app that launches faster and takes photos more quickly. Microsoft’s Lumia 1520 has a more than capable camera, but the slowness of capturing photos often lets it down, and this update is designed to address that.