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So f/2.8 is in fact a much larger aperture than f/22.It seems the wrong way around when you first hear it but you’ll get the hang of it.There are a number of results of changing the aperture of your shots that you’ll want to keep in mind as you consider your setting but the most noticeable one will be the depth of field that your shot will have.Depth of Field (DOF) is that amount of your shot that will be in focus.For example in most landscape photography you’ll see small aperture settings (large numbers) selected by photographers.This ensures that from the foreground to the horizon is relatively in focus.
In this case you’d choose a large aperture (small number) to ensure a shallow depth of field.
Let me illustrate this with two pictures I took earlier this week in my garden of two flowers.
The first picture on the left was taken with an aperture of f/22 and the second one was taken with an aperture of f/2.8. The f/22 picture has both the flower and the bud in focus and you’re able to make out the shape of the fence and leaves in the background.
Small (or shallow) depth of field means that only part of the image will be in focus and the rest will be fuzzy (like in the portrait at the top of this post.
You’ll see in it that the subjects eyes are in focus but the background is blurred.