曝光三要素:光圈、快门、ISO
光圈:光圈的大小决定了进入相机的光线量。光圈越大(数值越小),进入的光线越多,照片越亮;光圈越小(数值越大),进入的光线越少,照片越暗。大光圈适合拍摄人像,小光圈适合拍摄风景。
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