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F-number - Wikipedia, the free encyclopedia
瀏覽：1454
日期：2025-10-06
In optics, the f-number (sometimes called focal ratio, f-ratio, f-stop, or relative aperture[1]) of an optical system is the ratio of the lens's focal length to the diameter of the entrance pupil.[2] It is a dimensionless number that is a quantitative mea...看更多
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