| Exposure Modes | |
Many modern give you a choice of exposure modes. There are the usual four traditional modes and others that vary from one manufacturer to another. Program is usually the default mode for the camera. It will try to pick a shutter speed to avoid camera shake and once it has achieved this it will then start to close down the aperture to increase the depth of field. This mode gives the photographer no control but it should ensure that something useable appears on the film. Compact cameras use a program mode. Aperture priority mode allows the photographer to choose the aperture to set the depth of field. The camera then selects the appropriate shutter speed to ensure a correctly exposed picture. Increasingly sports photographers will use aperture priority even though their main consideration is a high shutter speed. If a large aperture is chosen than the camera will automatically pick a high shutter speed. If a high shutter speed was chosen in shutter priority mode than the camera may not be able to open the aperture sufficiently to give a correct exposure especially in a low light situation. Shutter priority lets the photographer choose the shutter speed and the camera selects that aperture to give a correct exposure. This can be useful to freeze a subject or to give the appropriate sense of movement but beware of low light situations when the camera cannot select a wide enough aperture. Manual mode is the least automated mode of all. The photographer has complete control over the choice of aperture and shutter speed. Obviously the photographer will have to make a meter reading or use a histogram to determine the exposure but then he is free to create a low or high key effect. This is the most creative mode to use but is more time consuming to master than the others. |
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