由于在远心系统中最大视场直接关系到镜头的镜头的光圈到物体之间的距离，若需要大的视场就必须要有大尺寸的前置镜头。
Because maximum field of view in telecentric systems directly relates to the lens aperture closest to the object, larger front lenses are necessary for larger fields of view.
在下面的图例中，极限星等是8——最大可能视场等级的默认星等。
In the illustration above, the limiting magnitude has been set to8.
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