With its large sensor, high-quality glass and 3.6x optical zoom, the Sony DSC-QX100 has all the fixings of a high-quality digital camera—but it clips to your iPhone or Android phone. With Sony’s PlayMemories Mobile app, your phone acts as the viewfinder. Unattached, it’s the remote control. The DSC-QX100 is a bit too big to fit in a jeans pocket but plenty small enough for a bag. It retails for $499.