A cinematographer shooting day-for-night with negative color film should check with the processing laboratory before the production begins. Laboratories have a far greater range of color correction available than the cinematographer has at his disposal during the original photography. They may add or subtract any color, or combination of colors, provided the original negative has sufficient exposure. Once the 85 filter is removed, however, it is often impossible to restore normal color balance to the film.
If the 85 filter is removed, it should be replaced with an ultraviolet filter, which will prevent overexposure of the blue sensitive layer and keep the negative within printing range. Warmer effects may be obtained by substituting a light yellow filter for the 85. A Pola Screen may also be used to darken a blue sky and provide the required underexposure (by ignoring its filter factor). It will have no effect on a bald sky, but it will act as a neutral-density filter and provide the needed underexposure. Remember that approximately %-stop exposure is gained by removing the 85 filter. This must be included in exposure calculations.
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