The red filter, the loss-90 percent, only 200 lumens of red light.

经红色滤光片后，光损失90%，只剩下200流明的红光。

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You have to put a deep red filter on the lens to increase the contrast.

你还需要在镜头上加一块深红色的滤光镜来提高反差。

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You have to put a deep red filter on the lens to increase the contrast.

你还需要在镜头上加一块深红色的滤光镜来提高反差。

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