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.

With Auto ISO selected, camera programming aims to ensure that shots are shake-free. Using the conventional photography rules of thumb, the camera attempts to keep the shutter speed to at least ...

With impressive ISO handling it's one of the best astrophotography cameras, and with impressive autofocus including animal detection it's also one of the best wildlife photography cameras.