针插象差效应(Pincushion effect) 是另一种像差。影像不会变蒙，但越近边缘，影像会变形，像是倍率变大!
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... pincushion correction circuit 枕形校正电路... pincushion effect 枕形效应 pincushion correction 枕形畸变校正...
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Rectilinear distortion: All three binoculars show a moderate amount of pincushion distortion as it is commonly employed to compensate for the globe effect and to provide a smooth panning of the image.
直线畸变：所有三款镜子表现了中等程度的枕形畸变，作为补偿滚球效应的普通措施，并且能提供平滑的视场盘。
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