Aperture Priority AE - Exposure is calculated based on the aperture value chosen by the photographer. This allows for depth of field (DOF: Range of focus) control - large aperture = shallow DOF and a small aperture = deep DOF.
Aperture Priority AE. When using this mode, the user selects the aperture giving control over the Depth of Field. A large aperture letting more light in gives a small depth of field, meaning not much will be in focus.
Aperture priority AE mode (Av).
In this AE mode you set the lens aperture by rotating the main dial located next to the shutter release button. The camera will then automatically set an appropriate shutter speed for you.
Three types are available: Programmed Auto Exposure (P mode), where the camera sets both aperture and shutter speed; Aperture Priority AE, (A mode) when the user sets the aperture and the camera finds the most appropriate shutter speed; ...
 See also: Aperture priority, Aperture, Camera, Manual, Mode
  
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