i've had an idea for an app but i'm not sure whether it will be possible or not. Well, I think it's definatly possible, but it's whether it'll be fast enough! Basically, I want to use the camera to detect a flash, and then if there is a flash, the phone's camera will flash too. Basically using the phone as a remote flash. What do you think? Would I be able code something fast enough to register a flash on the camera and then set the phone's flash off?