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Camera Controls

Exposure modes

Some exposure modes basically just decide how the camera sets aperture and shutter speed, and perhaps whether or not the flash will operate, leaving you to control other parameters. On digital cameras other modes may hand most or all of the decisions to the camera.

The first group are the traditional modes: Program, Aperture-priority, Shutter-priority and Manual. In Program mode the camera determines both aperture and shutter speed, according to some preset rules. In Shutter-priority you set the shutter speed and the camera then determines aperture to give a correct exposure. In Aperture-priority mode, you set the aperture and the camera then determines shutter speed to give a correct exposure. In Manual mode, the most traditional of all, you set both aperture and shutter speed. All exposure modes regulate aperture and shutter speed. The point about these four modes is they do nothing else: other settings like ISO and White Balance can be changed independently.