Open apertures (low f/stop numbers) are commonly used to blur the background of an image. For example, placing a flower close to the lens and using an open aperture such as f/2.8, will result in the flower being sharp and in focus while the background is soft and blurred.
An open aperture was used to blur out the background
Narrow apertures are often used when there’s a significant distance between the foreground and background, and you wish to have as much as possible sharp and in focus.
A narrow aperture was used to keep the image sharp front-to-back
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