I've bought various camera apps for my iPhone over the last couple of years, and by and large they've all been rubbish. They either add useless features, such as press-anywhere-to-shoot that doesn't quite work, or make things more complex, or add loads of initially exciting but ultimately unsatisfying effects. The camera app du jour is 645 Pro from Jag.gr. It claims to make the iPhone into a professional camera. It doesn't. A photo of my laptop with this post mid-flow However, that's not to say it's entirely useless. It does have many useful features, including: AF lock so you can focus then shoot rapidly without having to refocus every time AE lock so you can maintain constant exposure while moving around Spot/Average metering selector Quick flash on/off toggle White Balance lock so you can keep constant colours A proper live histogram so you can actually see the levels of your picture A self timer A quick selector to get different aspect ratio