A great photograph depends on a lot of things. A great view, a good camera, good light and of course, aperture settings and shutter speeds. What exactly does the aperture do? It is, basically, an aperture or an opening. The size determines how much light enters the camera through this opening and falls on the image sensor to form the digital photograph. Did too much light get through? Your photograph could be a washout. Was it too little? You'll get a dark picture.
Apertures come in different sizes - all classified as 'f' numbers. Each number lets in double the amount of light as the previous one. The standard is between f/1.8 and f/16. The smaller the aperture, the less light that will be let in. So an f/16 lens will let in half the amount of light as an f/8 lens. The aperture works in conjunction with the shutter as well when it comes to the amount of light let in. The speed at which the shutter opens and shuts is also a factor that determines the amount of light. When it comes to fast-paced action, a fast shutter speed is essential to capture the motion. For a landscape or a posed photograph a slower shutter speed is fine.
A photographer who is extremely particular will adjust both the aperture as well as the shutter speed. A perfect balance between the two could very often bring about that one perfect picture. It needs a trained eye in order to judge perfectly exactly what the settings should be. What he would also take into account is the depth of field, that is, how much of the image remains in focus. In larger apertures, there is just a short range that is in focus, whereas smaller apertures have a much deeper range, going from the foreground close by to way back, deep into the background. It would all depend on the kind of shot to determine what the settings should be.
For those of us who do not have the inclination, the understanding or the patience, we can always resort to the automatic setting. It's simple, the camera does all the work of adjusting for you and you get a good photograph. It might not be a work of art as might a photograph that a true professional photographer might have taken, but most cameras today give you a very acceptable quality.
Why do we need aperture settings at all? The simple, old cameras didn't have any. If you choose a camera with aperture settings like a telephoto, wide-angle and maximum aperture features, you know that even in an automatic setting, you will get different kinds of pictures, not the same, flat look. It gives you the freedom to take any kind of shot, anywhere, in any light. Otherwise you might find yourself restricted to typical, posed cheesy pictures without too much character or depth.
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