Because of the limits of technology, we are sometimes forced to choose our battles and settle for compromises. That’s true for smartphones and it’s true for digital cameras as well. Super zoom? Yes, you can have that, but you’ll have to settle for less than speedy performance. Sony, however, is saying that you can have your cake and eat it too, so to speak. The latest addition to its Cyber-shot family, the RX10 IV, boasts of a few firsts. But its real claim to fame is combining a 24-600 mm lens with fast autofocus and fast tracking in a single camera.