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The 85 color conversion filter transforms the color of the ambient light entering the lens by adding orange to the overall exposure. This helps match the scene to your film's white balance.

The Hoya 85 filter is helpful when:

You are using tungsten-balanced film (3200°K) and shooting in daylight. 

You are shooting with tungsten-balanced film (3200°K) indoors with 5500°K light sources, such as flashes or studio strobes. 

Because the 85 filter is not as strong as the 85B it will produce a slightly warmer look.