由于光圈控制着进入相机的光线总量，也就是说曝光强弱可以由光圈来控制。
Since the amount of light reaching the camera is dependent on the aperture, the overall exposure is altered by changes in aperture.
感光胶片上曝光所需的辐射能的总量。
The amount of radiant energy needed to expose a photographic film.
感光胶片上曝光所需的辐射能的总量。
The amount of radiant energy needed to expose a photographic film.
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