As far as smartphone cameras go, the iPhone takes fairly high-quality photos, but DxO aims to improve matters with the DxO ONE, a pocket-sized camera that packs a 1-inch 20.2 megapixel sensor. The pocket-sized accessory plugs into the Lightning port of your iPhone (or iPad) and effectively turns your screen into a viewfinder, complete with DSLR-like controls. There are various shooting modes to choose from, along with a 32mm-equivalent f/1.8 lens. You can also shoot 1080/30p or 720/120p video with slow motion playback. Retailing for $599, the DxO ONE can be pre-ordered here, with delivery set for September 2015.