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DLP500YX: DLP500YX

Part Number: DLP500YX

请问一下,为什么这个DLP500YX和说明书描写的不一样,说明书上说打开微镜偏转角17.5°,翻转轴为微镜对角线轴,我把这个DMD旋转45度之后,不管是垂直入射,还是斜入射,反射出来的光都没有和入射光在同一水平上,总是斜着出射,请问这是怎么一回事?