Exposure compensation allows me to fine-tune my exposure at the press of a button or flick of a dial – here's how I use it to conquer fast-moving subjects ...

Especially when using the default iPhone Camera app, which doesn't include any ISO controls. When getting into more complex photography, though, it's a basic setting you really need to know.

Today, of course, most cameras have replaced film with a digital image sensor. But ISO still describes light sensitivity, and ...