WARM POLARIZING CIRCULARS Hoya Filters Online Uk Photographic Filters

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A side effect of both linear and circular polarizes is they cool down or make the over-all color balance of a scene slightly bluish. The addition of the 81A glass corrects the color temperature, bringing the scene back to the original 5500K for daylight film' color balance. The 81A glass creates a much more pleasing and warm color balance to the entire scene while the circular polarizer increases color contrast and reduces the effect of atmospheric haze.