Information about Camera Aperture
Digital pictures are created when light hits the image sensor in the camera. If there is too much light the picture will seem to be washed out. If there is not enough light the photo will come out looking too dark. The amount of light that comes into the camera is determined by the shutter of the camera. The camera shutter has two basic settings that control how it works: shutter speed and aperture.
The aperture is the measure of the opening between the image sensor and the lens of the camera. A bigger aperture will let more light into the body of the camera than a lower aperture number. The standard camera lens will have an aperture rating of between f/1.8 and f/16.
Every f-number on the aperture will allow double the amount of light into the body of the camera as the f-number before it. For example, an f/8 aperture will have an exposure that is twice the amount of light as an aperture of f/16.
There are two main results that the aperture setting produces: the amount of light that hits the image sensor of the camera and the depth of field. The "depth of field" is all about the length of the picture that the camera is focusing in on. A camera that has a big aperture setting will have a depth of field that is thin. This means that the picture image that that the camera is focusing on will have a short focus. This then causes the objects that are in background and foreground of the picture to appear to be out of focus. A classic camera that has a lower aperture will have a field of depth that is wide and deep. In this case most of the objects in the image will remain in sharp focus.
The aperture of a camera is related to the speed of the shutter when it comes to determining how much light enters into the camera. When you mix bigger apertures with quick shutter speeds you will get much the same results as you would with a small aperture that is associated with a slow shutter speed. After a bit of practice you will soon know which combination is right for taking different types of pictures.
Most classic and digital cameras have an automatic setting that will do all the calculations for you when it comes to aperture settings. Most experienced photographers calculate the shutter speed and aperture by themselves so that they get a precise and specific artistic image.
If you are shooting a series of action shots choose a higher aperture combined with a quick shutter speed. The quick shutter speed will "stop" the action of the camera with a limited blurring. You can also use bigger apertures when the light conditions are low and when there is not much action in the scene. You can combine a slow shutter speed with a large aperture if this is the case.
A classic point and shoot camera will have an aperture that is set and cant be adjusted. More expensive cameras will have an aperture that has settings you can adjust. When you are buying a used digital camera you will want to take a close look at the aperture settings. The aperture settings of the camera can be summed up in this way: maximum aperture, the range of the aperture, max wide-angle, and max telephoto.
You might find it more useful to know what the aperture range of the camera is than what the maximum apertures can be set as. A wide range will make your camera more flexible for a variety of shots. For every-day-photography a good range of aperture settings would be f/1.8 to f/16.
Every camera lens will also have an aperture rating. A telephoto camera lens will usually have a lower aperture range than a lens that is wide angle. This is because lenses that are longer will need to have more light since they take in light from a small source and therefore need a larger aperture to produce f-numbers that comply with shorter lenses.
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