Kodak Infrared filmler konusunda araştırmalar yaparak yeni sistemler geliştirmiştir. Bu filmlerle kullanılacak filtreler de yine kendisi tarafından üretilmiştir.
Yellow Gelatin Filters
12
Deep Yellow. Minus-blue filter (see No. 32 for minus-green and No. 44A for
minus-red). Provides haze penetration in aerial photography. Cancels
blue light when exposing infrared-sensitive films.
15
Deep Yellow. Darkens sky in landscape photography more dramatically than No.
8 or 9. Useful for copying documents on yellowed paper. Greater blue
attenuation for infrared photography and for fluuorescence photograpy.
Orange and Red KODAK WRATTEN Gelatin Filters
25
Red Tricolor. For color separation work and tricolor printing, used with No.
58 (green) and No. 47B (blue). Contrast effects in commercial and
outdoor black-and-white photography. Haze penetrationi aerial work.
Removes blue in infrared photography.
Miscellaneous Filters
18A
Visibly opaque glass filter. Transmits only ultraviolet radiation between about
300 and 400 nm (e.g., 365 nm line of mercury spectrum) and infrared
radiation. Isolates UV for ultraviolet reflection photography.
87, 87C
Visibly opaque filters absorb unwanted visible light in infrared photography.
89B
Visibly opaque. For infrared photography, especially aerial.
96
Neutral.
In color and black-and-white photography, reduces intensity of visible
light. Uniform attenuation throughout the visible spectrum. Greater
transmission in infrared. Available in 13 densities, covering the
transmittance range from 80 to 0.01.
