Last Updated
：2025/11/21
f-number
（ plural ）
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(photography) The ratio of the focal length of a lens to its diameter; a measure of the light-gathering ability of the lens.
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f-number
To achieve a shallow depth of field, set the f-number low so the background blurs.
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To achieve a shallow depth of field, set the f-number low so the background blurs.
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