The directions state that a dark room is necessary - as with all projectors and, the lens must be focused (easily done by turning it with your hand) to acheieve a clear image.

• 说明书指出，投影的房间最好的暗光的，就像其他的放映机一样，镜头必须聚焦才能有清晰的图像(操作很简单，手动即可)。