... variable aperture stop 可变孔径光阑 aperture stop number 光圈档数 Iris-aperture stop 虹膜孔俓光珊 ...
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Each aperture size (referred to as a stop) is marked with a corresponding number that represents half the light of the previous stop.
每一档数字都是比前档减少一半的通孔大小。
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