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Keep in mind that a change in shutter speed from one stop to the next doubles or halves the amount of light that gets in also – this means if you increase one and decrease the other you let the same amount of light in – very handy to keep in mind).One thing that causes a lot of new photographers confusion is that large apertures (where lots of light gets through) are given f/stop smaller numbers and smaller apertures (where less light gets through) have larger f-stop numbers.I’ve previously written about the first two and today would like to turn our attention to .Before I start with the explanations let me say this.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.On the other hand in portrait photography it can be very handy to have your subject perfectly in focus but to have a nice blurry background in order to ensure that your subject is the main focal point and that other elements in the shot are not distracting.In this case you’d choose a large aperture (small number) to ensure a shallow depth of field.
Darren Rowse is the editor and founder of Digital Photography School and Snapn Deals.
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.
Macro photographers tend to be big users of large apertures to ensure that the element of their subject that they are focusing in on totally captures the attention of the viewer of their images while the rest of the image is completely thrown out of focus.
I hope that you found this introduction to Aperture in Digital Photography helpful.