It depends on the exposure mode.
In Program mode (P), turn the command dial and the camera will shift the exposure by changing both the aperture and the shutter speed.
In Aperture-priority mode (A), turn the command dial and the camera will adjust the shutter speed to suit.
In Manual mode (M), hold the aperture button and turn the command dial.
If you're using a lens with an aperture ring, turn it to its smallest aperture (largest f/number) and lock it.
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There is no aperture ring and you still havnt helped me to change the aperture. I know how to get to the aperture, but how do i set it to the aperture of my choice?
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