b. Polarized neutral gray filters can also be used with color films.
This filter will darken a blue sky without affecting the color balance of the
film. This filter is normally used to subdue or eliminate oblique reflections
and glare from nonmetallic surfaces, thus increasing color saturation.
Nevertheless, it is also used to reduce or partially clear distant haze.
Remember that the polarizing filter requires a 4X (two-stop) increase in
exposure.
9.
Conversion filters.
a. Conversion filters are required whenever an emulsion balanced for
tungsten illumination is used in daylight or an emulsion balanced for daylight
is used with tungsten illumination.
b. Inferior color will result if daylight film is used with tungsten
lighting, even with the recommended filter.
c. If top color balance is desired, select the film recommended for the
light source and avoid the use of filters.
If one film must be selected for
both tungsten and daylight, use a tungsten film to photograph the scenes
illuminated under tungsten light.
Add a No. 85B filter when filming under
daylight illumination.
10.
Aerial color films.
a. There are numerous films that can be used for filming aerial footage.
The film most commonly used in the military are listed in Table 1-2. Daylight
color films are balanced at 5500K.
Table 1-2.
Color balance of films
b. If tungsten film must be used, Ektachrome EF 7242 is a good selection.
When used with a Kodak Wratten No. 85B filter, it gives excellent results under
daylight conditions.
18
Previous Page
