When adjusting a camera's lens, what physical change happens as you switch to a higher f-number like f/16?
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The f-number represents the ratio of the lens's focal length to the diameter of its entrance pupil. Because it is a fraction, a higher f-number (like f/16) actually means a much smaller aperture opening, which lets in less light but increases the depth of field. This counterintuitive scale is one of the first hurdles for amateur photographers learning manual exposure controls!
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Source: Wikipedia (CC BY-SA)
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