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单反怎样调焦距
更新时间: 2020-11-01 00:00:00  

移动镜头中某组镜片的轴向位置。焦距是光学系统中衡量光的聚集或发散的度量方式,指平行光入射时从透镜光心到光聚集之焦点的距离;亦是照相机中从镜片中心到底片或CCD等成像平面的距离。具有短焦距的光学系统比长焦距的光学系统有更佳聚集光的能力。

关键词: 怎样 焦距

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