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Photo 101 : Effect of Aperture < Previous | Next >
Aperture controls the depth of field - referring to the areas which are in focus in the photo. It is easier to show the effect of aperture than talk about it, so take a look at the following images.
Shallow depth of field Greater depth of field
The image on the left shows a shallow depth of field, since only a narrow portion of the image is in focus (the background is all out of focus). This is the effect of a large aperture (eg. f/2.8 or f/4). The image on the right shows greater depth of field, and the entire image from the foreground to the background is sharp. This is the result of a smaller aperture, such as f/16 or f/22.

larger aperture = narrower depth of field

smaller aperture = greater depth of field

Now you can see the creative effects of both aperture and shutter speeds. Take a break now if you have to, because we’re going to talk about how aperture and shutter speeds relate to each other (which requires an alert mind to understand quickly).
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