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Three modes to know are manual, aperture priority, and shutter priority.
- In manual mode, you control the aperture size and the shutter speed. (Canon & Nikon: M)
- In aperture priorty mode, you control the aperture size, and the camera chooses an appropriate shutter speed. (Canon: AV; Nikon: A)
- In shutter priority mode, you control the shutter speed, and the camera chooses an appropriate aperture. (Canon:Tv; Nikon: S)