一是远不如滤线栅的效果好，二是被照体与胶片距离(object to image distance，OID)增大， 影像的几何模糊度也增大。 参考文献： 医学影像技术学术语详解.
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It is necessary to point out that, radar can take image and distance of an object at same time, but radar is short of concealed ability.
雷达能同时得到目标的影像和距离，但由于雷达是采取主动方式获取信息，在获取目标的同时，也将自身暴露，缺乏隐蔽性。
The position of the image and the amplitude variation in the optical field are associated with the focus and the distance from the object to the front focal plane of the lens system.
象的空间位置和光场振幅的变化与透镜系统的焦距以及物体距焦平面的位置有关。
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