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我该使用什么样的光学器件消除Lightcrafter自带的100%的偏移角(offset)?

Other Parts Discussed in Thread: DLP4500
 ,我想在镜头外面外置一个什么样的光学器材可以将100%的偏移改为正常的0%偏移?即上图所示的图像中心与光轴精准重合?