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. |