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Wanhao projector image blur is what reason

The main reason Wanhao projector image blur with instruments in three cases:

1, the projection screen to improper protection, regular cleaning, the projection screen matte reduce, causes image blur. The most intuitive this fault judgment is to see the inside of the filament from the projection screen.

2, lens and optical system is dirty or stained with oil oxidation due to.

3, lighting installation is improper, optical brightness is dark.

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