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What is depth of field?
How does aperture affect depth of field?
Aperture determines how much light enters the camera lens, but it also affects the depth of field. A smaller aperture (higher f-number) creates a larger depth of field, meaning more of the image will be in focus. A larger aperture (lower f-number) creates a smaller depth of field, meaning less of the image will be in focus and the background may be blurred.