Assertion: camera's mode | /r/CapableOf | set the aperture
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text: DEP ( ) mode, on some Canon cameras, sets the aperture to yield the desired depth of field: one points at the nearest object that one wants to be in focus, half-presses the shutter, then points at the farthest object that one wants to be in focus, half-presses the shutter, at which point the camera sets both focus and aperture so that both objects are in focus.