f-number

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f-number
focal distance divided by the effective diameter of the camera lens aperture (Photography)


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F-number
In optics, the f-number (sometimes called focal ratio, f-ratio, or relative aperture) of an optical system expresses the diameter of the entrance pupil in terms of the effective focal length of the lens. It is the quantitative measure of lens speed, an important concept in photography.
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f-number
f-number
danh từ hệ số hiệu dụng của thấu kính
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