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ViewSonic PJ678 User Manual page 22

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调节投影机变焦和聚焦
1. 旋转聚焦环，使图像聚焦。建议聚焦时用静止图像。
2. 旋转变焦环，调节图像。向右旋转，缩小图像。向左旋转，放大图像。
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PJ678

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