Aperture Priority Mode
It is a setting on most digital cameras that allows the user to choose the aperture, while the camera calculates the shutter speed for a good exposure.
The need for using this shooting mode arises from the need to control the depth of field (how much of the image will be in focus); the larger the aperture, the shallow the depth of field.
This mode is useful when you need to separate the subject from its background. If you want to make a portrait of someone, with trees in the background, a large aperture of 2 or 3 will be the one to use. If you use a smaller aperture, like 8 or 16, the trees and the subject are all going to be clear and in focus. This way, you might obtain the strange image of a branch sticking out of your friend's head!
However, using a small aperture is very useful in dealing with landscape photography. In this case, you usually create an image of a large space and showing every detail of the landscape becomes paramount. In this case, using a small aperture will give you a full clear image.
Aperture Priority | Shutter Speed 1/400 | Aperture Value 2.5
Aperture Priority | Shutter Speed 1/100 | Aperture Value 5.6
Aperture Priority | Shutter Speed 1/400 | Aperture Value 5
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