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| 焦距比数 | |||
| 光圈数 | |||
| F值透镜的焦点距离 f和它的有效口径 D之比 | |||
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| f数 | |||
| f 值指镜头相对孔径的倒数显技 | |||
| 光圈值; 光圈系数; 光圈大小; 焦距孔径比数 | |||
| f 值 (镜头相对孔径的倒数) | |||
| 光圈号数 | |||
| 光圈数; f 数 | |||
| English thesaurus | |||
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| focal number | |||
| f /# | |||
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F number : 6 phrases in 1 subject |
| Technology | 6 |
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