Wratten Filter Numbers and Uses

Wratten
number
Color Filter
factor
Correction
in F-Stops
Uses and Characteristics
1A clear Called a skylight filter. Absorbs ultraviolet wavelengths. Reduces haze in outdoor landscape photographs.
2A pale yellow Absorbs ultraviolet wavelengths.
2B pale yellow Absorbs ultraviolet wavelengths, slightly less than #2A.
2C Absorbs ultraviolet wavelengths.
2E pale yellow Absorbs ultraviolet wavelengths, slightly more than #2A.
3 light yellow Absorbs blue. Slightly darkens the sky in black-and-white photographs.
4 yellow
6 light yellow
8 yellow 2 Absorbs more blue than #3.
9 deep yellow Absorbs more blue than #8.
11 yellowish-green Color Correction.
12 deep yellow "Minus-blue." Complements are #32 "Minus-Green" and #44A "Minus-Red." Used with Ektachrome or Aerochrome Infrared films to obtain false-color results. Used in ophthalmology and optometry with a slit-lamp under exposure by a cobalt blue light to improve contrast when examining the cornea and evaluating the fit of contact lenses.
15 deep yellow Darkens the sky in black-and-white outdoor photographs.
16 yellow-orange As #15 but increased effect.
18A Based on Wood's glass.
21 orange Contrast filter. Blue and blue-green absorption.
22 deep orange Contrast filter, greater effect than #21.
23 light red
24 red Color separation of Kodachrome transparency film. Complements are #47B and #61.
25 red tricolor Color separation. Infrared photography.
25A red 8 +3 Strong contrast red filter. Color separation. Black-and-white infrared film.
26 red
29 deep red Color separation. Complements are #47 and #61. For black-and-white outdoor photography to make blue skies appear very dark or almost black. For infrared photography, blocks visible light, increasing the effect of infrared wavelengths.
32 magenta "Minus-Green." Complements are #12 "Minus-Blue" and #44A "Minus-Red."
34A violet "Minus-Green" and "Plus-Blue" separation.
38A blue Absorbs red, some UV and some green.
44 light blue-green "Minus-Red" filter with UV absorption.
44A light blue-green "Minus-Red." Complements are #12 "Minus-Blue" and #32 "Minus-Green."
47 blue tricolor Used for color separation. Complements #29 and #61.
47A light blue Color conversion. Removes light that is not blue. Enables blue and purple objects show a broader range of colors. Medical applications involving fluorescent dyes.
47B deep blue tricolor Color separation. Also used to calibrate video monitors with a SMPTE color bar test pattern.
50 deep blue
56 light green
58 green tricolor Color separation. Enables green objects to show a broader range of colors.
61 deep green tricolor Color separation, complements #29 and #47.
70 red Provides proper contrast with color separation processes and infrared photography.
80A blue 4 2 Color Conversion. 3200 K to approximately 5500 K. Allows proper exposure of Daylight Balanced A film under tungsten lighting.
80B blue 3 1+2/3 Similar to 80A; 3400 K to 5500 K.
80C blue 2 1 Similar to 80A; 3800 K to 5500 K. Typically used so that old-style flashbulbs can be used on a daylight film.
80D blue 1.5 1/3 Similar to 80A; 4200 K to 5500 K.
81A pale orange 1.4 1/3 Warming filter to slightly decrease color temperature slightly. For proper expsoure of Tungsten Type B film (3200 Kelvin) with 3400 Kelvin photoflood lights. The opposite effect of 82A.
81B pale orange 1.4 1/3 Warming filter. Slightly stronger than 81A. The opposite of 82B.
81C pale orange 1.5 1/3 Warming filter. Slightly stronger than 81B, opposite of 82C.
81D pale orange Warming filter. Slightly stronger than 81C.
81EF pale orange 1/3 Warming filter. Stronger than 81D.
82A pale blue 1.3 1/3 Cooling filter to increase the color temperature slightly. The opposite of 81A.
82B pale blue 1.4 2/3 Cooling filter. Slightly stronger than 82A and opposite effect of 81B. Color conversion for proper exposure of Tungsten Type B film (3200 Kelvin) exposed by ordinary household 100 Watt incandescent lamps (2900 Kelvin).
82C pale blue 1.5 2/3 Cooling filter, slightly stronger than 82B and opposite of 81C.
85 amber 1.5 2/3 Color conversion. Opposite effect of 80A. Warming filter. Converts 5500 Kelvin light source to 3400 Kelvin. Allows proper exposure of Tungsten Type A film outdoors.
85B amber 1.5 2/3 Similar to 85. Converts 5500 K to 3200 K.
85C amber 1.5 Similar to 85. Converts 5500 K to 3800 K.
85N3 amber Neutral density of 1 stop + color conversion. Opposite effect of 80A. Opposite effect of 80A. Warming filter. Converts 5500 Kelvin light source to 3400 Kelvin. Allows proper exposure of Tungsten Type A film outdoors.
85N6 amber Neutral density of 2 stops + color conversion. Opposite effect of 80A. Opposite effect of 80A. Warming filter. Converts 5500 Kelvin light source to 3400 Kelvin. Allows proper exposure of Tungsten Type A film outdoors.
85N9 amber Neutral density of 3 stops + color conversion. Opposite effect of 80A. Warming filter. Converts 5500 Kelvin light source to 3400 Kelvin. Allows proper exposure of Tungsten Type A film outdoors.
87
87C opaque Passes infrared but not visible wavelengths.
89B near-opaque Passes infrared, blocks visible wavelengths below 720 nm (very dark red). Aerial photography use.
90 dark grayish amber Used for viewing scenes without color before photographing them.
92 red Color densitometry.
93 green Color densitometry.
94 blue Color densitometry.
96 grayish varies Neutral density filter. Blocks all colors evenly, darkening a scene overall.
98 blue Equals a #47B plus a #2B filter.
99 green Like a #61 plus a #16 filter.
102 yellow-green Color conversion to make a barrier-level type photocell respond like the human eye.
106 amber Color conversion to make an S-4 type photocell respond like the human eye.