Aperture – the f-number (sometimes called f-stop) is often used in photography to obtain the depth of field (DOF, the amount of the image that is in focus from the subject to the background).
This is also referred to as Aperture Priority Auto Exposure, A mode, AV mode (aperture value mode), or semi-auto mode. Typical ranges of apertures used in photography are about f/2.8–f/22 or f/2–f/16.
This is a digital photography basic that a photographer must learn in order to take pictures without using auto mode. Aperture is one of the three basics you must master. The aperture in photography refers to the size of the lens opening when the picture is taken. The aperture is the size of the opening of the lens when you take a picture.
The aperture is used in conjunction with the shutter speed and ISO setting to properly expose the image. One important reason for having an adjustable aperture is to make sure you can get the proper exposure. For example, if you are out on a really sunny day and had to shoot with your aperture wide open, you may not be able to get the right exposure by just changing the shutter speed and ISO setting. You might have to use a smaller aperture to keep from exposing the image too much.
The aperture also controls the depth of field in an image. The depth of field refers to the amount of the image to the background area that is in focus. A wide aperture setting will make the subject be in a sharp focus while everything behind the subject will be blurred. Keep in mind a wide aperture is f2.8 and a small aperture is f22. If you use a small aperture, most of the frame will be in focus, including the foreground and background (f22). It could be used to take a picture of a stream when you also want the mountain in the background in focus. Or if you are taking a photograph of a class picture you would use an aperture of at least f8 so that people in all of the rows will be in focus. This is an example of having a larger depth of field. If you used f2.8 one row of students would be in focus and the rest would be blurred.
One thing to remember about the aperture size is that a smaller f/stop number on a camera represents a larger aperture. For example, f/2.8 is a much larger aperture than f/22.
The depth of field is a very important concept that every photographer should keep in mind when taking pictures. It is equally important for a photographer to understand how to use the aperture setting on a camera to achieve the desired depth of field. These are both very important concepts to master when learning digital photography.
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