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 1/125 | Aperture Value 3.2

Aperture Priority | Shutter Speed 1/100 | Aperture Value 5.6

Aperture Priority | Shutter Speed 1/400 | Aperture Value 5