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DLP4500如何改变投射画面的大小，摄像机和投影仪的位置需要固定在比较近的距离内，但是这样照相机就不能 全部拍到投影仪投出的光。如何把投影仪投出的光变小 或者把照相机视角变大， 应该怎么操作呢？
调整投影机镜头或摄像机镜头焦距FOV,或者更换镜头
