A few years ago no one would have thought that a digital camera would be capable of taking such incredible pictures, videos, and panoramas, but now you can use these and other features like smile detection and eliminating red eye to take great photos. There is one more thing that is important for making high-quality photographs—having the right exposure. For that, you need the help of a light meter. That’s where the new Luxi ($29.99) comes into play. It turns your iPhone 5 into a quality incident light meter. If you use your camera’s built in light meter, you are getting a reading for reflected light, which could be a false reading resulting in a photograph of under or overexposed poor quality.