F Number - F Number
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…Also called F-number. A numerical value that indicates the brightness of an optical system, calculated by dividing the focal length of a lens by the effective aperture of the lens (the diameter of the entrance pupil). … *Some of the terminology that refers to "F number" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
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…Fナンバーともいう。光学系の明るさを表す目安となる数値で，レンズの焦点距離をレンズの有効口径(入射瞳の直径)で割ったもの。… ※「Ｆ ナンバー」について言及している用語解説の一部を掲載しています。 出典｜株式会社平凡社世界大百科事典 第２版について | 情報 |
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