Aperture and Shutter Speed

Aperture is the amount of light that is let into the camera and shutter speed is the amount of time it takes for you shutter to open and close. When the camera is a low shutter speed your allowing more light into the camera. On my camera (Nikon D90) there are setting for the camera called Mode A (Aperture priority auto) which chooses your exposure when you press down on the shutter release button halfway and than gives you the job to change the aperture to where you want it to be by rotating the sub dial. For Shutter Speed it's called Mode S (Shutter-Priority Auto). This mode you choose the shutter speed while the camera automatically selects the aperture that will produce the optimal exposure.