Results for « 孔径焦距比 » (cmn)
13821408-n
焦距比数, 曝光 速率, 焦距 比数, 孔径 焦距 比, 孔径焦距比, 焦比, 曝光速率
speed, focal ratio, f number, stop number
     the ratio of the focal length to the diameter of a (camera) lens system

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