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68 IV. MAKING 16-MM ORIGINALS
than for artificial light film. If the same subject could be photographed on both types of film with correct lighting for each, the result would be substantially the same in projection.
Because of the higher blue-sensitivity and the higher green-sensitivity of the artificial light film as compared with the daylight film, it it possible to reduce the incident light in the blue and green ranges by the correct amounts with a filter when photographing subjects in daylight with artificial light type film in the camera. Since a Kodak Wratten #85 filter is intended to do just this by merely reducing the effective color temperature, the exposure index for the film remains the same as for photographing with artificial light without a filter. This simple expedient is quite satisfactory for conventional photographing; where more accurate rather than pleasing color rendition is required, more involved corrections may be needed. These usually comprise a set of relative intensity measurements in the blue, green, and red color ranges and the selection of suitable filters indicated by the measurements.
Scenes photographed on cloudy days at high altitudes, distant scenes with haze, and snow scenes usually have excessive blue and often appreciable ultraviolet present in the light. Since ultraviolet records as blue on the film (adding to the excessive blue already present), a filter is needed to remove the ultraviolet, and, in extreme cases, some of the blue. The Kodak Wratten #1A Skylight Filter is useful with daylight type color film outdoors in open shade under a clear blue sky where pictures without a filter would be too bluish ; occasionally it may be useful on an overcast day for distant scenes, sunlit snow scenes, aerial photos, and mountain views. The Kodak Wratten #2B absorbs radiation shorter than 390 m/x ; it is useful for the bluest of such scenes.
If a distant scene is photographed with a Kodak Wratten #85 filter, and. artificial light type film is exposed with daylight, no filter similar to the Kodak Wratten #1A is needed, since the Kodak Wratten #85 effectively absorbs rays shorter than 380 millimicrons.
In general, it is preferable to use daylight-type color film in daylight and artificial light type film (type A) with photoflood illumination. Because Wratten #85 filter with artificial light type film does not alter the color temperature relationship in the exact manner that natural light changes, daylight-type color film will usually give better color rendition than a Kodak Wratten #85 filter with artificial light type film, particularly when photographing on overcast days. Daylight-type film is also preferred, because its dyes are somewhat less fugitive than those