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dlp4500的投射比 比较大，很短的距离上投射出来的画面就很大，我想问一下，有没有什么手段能在投射距离不变的情况下，改变投影图面的大小？
通常可以用缩小透镜,但是满足这个标准的很少, 畸变小,分辨率高的很高成本.
